Heart Health

Cardiovascular disease begins before the heart attack.

Your cardiovascular system is always moving. With every heartbeat, blood travels through thousands of miles of vessels, delivering oxygen and nutrients while carrying away carbon dioxide and waste. When the system is healthy the heart pumps efficiently, blood vessels expand and contract, blood pressure stays appropriately regulated, and the inner lining of the arteries helps control inflammation, clotting, circulation and vessel tone. Those functions can begin changing years before anyone experiences chest pain, a stroke or heart failure.

Begin reading

THE QUIET YEARS Vessel lining changes Pressure rises Particles accumulate Metabolism drifts The event becomes visible WHERE IT ACTUALLY BEGINS The blood vessels Blood pressure Metabolism Daily conditions The heart is where it becomes visible. It is rarely where the story started. VESSELS · PRESSURE · PARTICLES · TIME

The quiet years

What changes before anything is felt

Vessel lining changes
Pressure rises
Particles accumulate
Metabolism drifts

Where it actually begins

The blood vessels

Blood pressure

Metabolism

Daily conditions

The heart is where it becomes visible. It is rarely where the story started.

Heart disease may become visible at the heart. But the process often begins earlier, in the blood vessels, in metabolism, in blood pressure and in the daily conditions surrounding them. By the time an event announces itself, the biology behind it has usually been under way for a long time.

That is not a reason for alarm. It is the reason prevention works at all, and it is why a cardiovascular evaluation looks at more than one number.

This page explains the system, what can be measured, what the measurements mean and when symptoms need emergency care.

The central idea

The cardiovascular event is often the final chapter of a story that began years earlier.

Which means the useful work happens in the chapters before it.

Free guide

Get Beyond Cholesterol

A basic cholesterol panel is useful. It is not the complete cardiovascular story. The free guide explains how lipoproteins, blood pressure, blood sugar, inflammation, family history, lifestyle and selected imaging can be read together.

Functional Medicine · Guide
Beyond Cholesterol

What a standard panel misses about cardiovascular risk.

Dr. Daniel Gonzalez

More than the heart

The heart is the pump. The vessels are the living network.

The heart moves the blood. The blood vessels are the delivery network, and the blood itself carries oxygen, nutrients, hormones, immune cells, lipoproteins and countless signalling molecules to every tissue in the body. Different cardiovascular conditions involve different parts of that network, which is why they are not interchangeable and why treatment has to match the part involved.

THE PUMP THE NETWORK Heart muscle Heart valves Electrical rhythm Coronary arteries Arteries to the brain Peripheral arteries Veins and capillaries The vessel lining contraction flow direction timing supplies the heart supplies the brain supplies the limbs exchange and return regulation Blood pressure regulation and the clotting and anticoagulation systems run across all of it.

The cardiovascular system

The pump

Heart muscleContraction
Heart valvesFlow direction
Electrical rhythmTiming

The network

Coronary arteriesSupply the heart
Arteries to the brainSupply the brain
Peripheral arteriesSupply the limbs
Veins and capillariesExchange and return
The vessel liningRegulation

Blood pressure regulation and the clotting and anticoagulation systems run across all of it.

Coronary artery disease affects blood flow to the heart. Stroke involves blood flow within the brain. Peripheral artery disease affects circulation to the limbs. Heart failure affects the heart’s ability to meet the body’s circulatory needs. Arrhythmias involve the electrical rhythm. Valve disease affects how blood moves through the chambers. These conditions share risk factors. They are not the same problem.

The vessel lining

The inner surface of every blood vessel is alive.

The inside of a blood vessel is not passive plumbing. It is lined by a thin layer of cells called the endothelium, and that lining helps regulate vessel dilation, blood pressure, clotting, inflammation, the movement of substances through the vessel wall, oxidative balance and repair after injury.

A healthy endothelium helps the artery stay responsive and resistant to unnecessary clotting and inflammation. When it becomes dysfunctional the vessel may dilate less readily, become more permeable, become more inflammatory and become more vulnerable to atherosclerosis.

That does not make endothelial dysfunction the single cause of cardiovascular disease. It is one important biological environment in which many recognised risk factors converge.

Cardiovascular risk is not only about what circulates in the blood. It is also about the condition of the vessels carrying it.

Healthy and dysfunctional

Same vessel

RESPONSIVE Dilates when flow increases Keeps the barrier selective Holds inflammation in check Balances clotting DYSFUNCTIONAL Dilates less readily More permeable More inflammatory More prone to clot

Responsive

Dilates when flow increases
Keeps the barrier selective
Holds inflammation in check
Balances clotting

Dysfunctional

Dilates less readily
More permeable
More inflammatory
More prone to clot

What actually happens

Atherosclerosis is a process in the wall, not sludge in a pipe.

Atherosclerosis is the progressive build up of plaque within the walls of arteries. It involves considerably more than cholesterol sticking to the inside of a tube. Lipoprotein particles enter the arterial wall. Some become retained and modified. Immune cells respond. Inflammation develops. A plaque begins to form. What happens next is not the same for every plaque.

THE SEQUENCE Particlescirculate Some enterand are retained Modification andimmune response A plaqueforms WHAT MAY HAPPEN NEXT Remain relativelystable Becomecalcified Narrow theartery Becomevulnerable A plaque does not need to block an artery completely before it becomes dangerous. If a vulnerable plaque ruptures, a clot may form and interrupt blood flow abruptly.

The sequence

1
Particles circulate
2
Some enter and are retained
3
Modification and immune response
4
A plaque forms

What may happen next

Remain relatively stable

Become calcified

Narrow the artery

Become vulnerable

A plaque does not need to block an artery completely before it becomes dangerous. If a vulnerable plaque ruptures, a clot may form and interrupt blood flow abruptly.

In a coronary artery that can cause a heart attack. In an artery supplying the brain it can contribute to an ischaemic stroke. So the central cardiovascular question is not simply what is my cholesterol. It is what is my overall likelihood of developing, or already having, vascular disease.

Necessary and consequential

Cholesterol is essential. Particle exposure still matters.

Cholesterol performs essential work. The body uses it to help build cell membranes, steroid hormones, bile acids, vitamin D and nervous system structures. Because it does not dissolve freely in blood, it travels inside lipoprotein particles. Low density lipoproteins carry cholesterol and other lipids from the liver into circulation. High density lipoproteins participate in cholesterol transport and several other biological functions.

HOW IT TRAVELS Cholesterol does not float loose in blood. It is carried inside particles. The concern is not that cholesterol exists. It is that greater lifetime exposure to atherogenic particles increases the opportunity for them to enter and remain in vulnerable walls. WHAT AN EVALUATION WEIGHS LDL cholesterolFamily history Non-HDL cholesterolDiabetes TriglyceridesBlood pressure HDL cholesterolSmoking Apolipoprotein BKidney disease Lipoprotein(a)Age No single result should be read in isolation.

How it travels

Cholesterol does not float loose in blood. It is carried inside particles.

The concern is not that cholesterol exists. It is that greater lifetime exposure to atherogenic particles increases the opportunity for them to enter and remain in vulnerable walls.

What an evaluation weighs

LDL cholesterol
Non-HDL cholesterol
Triglycerides
HDL cholesterol
Apolipoprotein B
Lipoprotein(a)
Family history, diabetes, blood pressure
Smoking, kidney disease, age

No single result should be read in isolation.

Cholesterol is biologically necessary. Atherogenic particle exposure is still clinically meaningful. Both statements can be true.

For a longer discussion of what cholesterol does and how the sub-fractions differ, see Cholesterol: Friend or Foe?

Two different questions

LDL cholesterol and ApoB do not measure the same thing.

LDL cholesterol estimates how much cholesterol is being carried within LDL particles. Apolipoprotein B helps estimate how many atherogenic particles are present, since each of those particles carries one ApoB molecule.

Two people can have similar LDL cholesterol and different particle numbers. That gap matters most when triglycerides, insulin resistance, diabetes or metabolic syndrome change the relationship between the amount of cholesterol and the number of particles carrying it.

Neither marker makes the rest of the evaluation unnecessary. They add different pieces of information to the same picture.

Same cholesterol, different particles

Two people

PERSON A Fewer, larger particles Lower ApoB PERSON B More, smaller particles Higher ApoB Similar LDL cholesterol. Different particle burden. Context decides whether the two measures agree.

Person A

Fewer, larger particles

Lower ApoB

Person B

More, smaller particles

Higher ApoB

Similar LDL cholesterol. Different particle burden. Context decides whether the two measures agree.

Largely inherited

Lipoprotein(a) does not show up on a standard panel.

Lipoprotein(a), usually written Lp(a), is an inherited lipoprotein that can contribute to atherosclerotic and valvular cardiovascular risk. Levels are strongly influenced by genetics and are not reliably predicted by a standard cholesterol panel. Someone can have an otherwise unremarkable lipid profile while carrying elevated Lp(a). Because levels are generally stable across adult life, a single measurement usually answers the question.

01
Premature cardiovascular disease
Disease appearing earlier than the conventional risk factors would predict.
02
A strong family history
Heart attack or stroke in close relatives, particularly at a young age.
03
Unexplained atherosclerosis
Plaque found without an obvious reason for it.
04
Familial hypercholesterolemia
An inherited pattern of very high LDL cholesterol.
05
Calcific aortic valve disease
Lp(a) is associated with valvular as well as arterial risk.
06
Disease despite controlled risk factors
When the conventional numbers look managed and disease still progresses.

An elevated result does not mean disease will develop. It changes where the person sits in the overall risk picture, and it should be interpreted with their complete profile rather than on its own.

Continuous physical stress

Blood pressure does not need to hurt before it causes harm.

Blood pressure is the force exerted against arterial walls as the heart pumps and relaxes. When pressure stays elevated, the vessel wall experiences repeated mechanical stress, and that stress is felt in more than one organ. High blood pressure usually produces no obvious symptoms at all, which is precisely why measurement matters.

SUSTAINED PRESSURE Repeated mechanical stress on the wall WHERE IT IS FELT BrainHeartKidneysEyesVessels stroke, cognitioncoronary, failurekidney diseaseretinal damagestiffening One elevated reading does not establish chronic hypertension. Repeated measurements, proper technique, home readings and clinical context decide whether the pattern is persistent.

Sustained pressure

Repeated mechanical stress on the vessel wall.

Where it is felt

BrainStroke, cognition
HeartCoronary disease, heart failure
KidneysKidney disease
EyesRetinal damage
VesselsArterial stiffening

One elevated reading does not establish chronic hypertension. Repeated measurements, proper technique, home readings and clinical context decide whether the pattern is persistent.

Metabolic and vascular

Blood sugar is also a cardiovascular signal.

Blood sugar disorders are not confined to diabetes. Insulin resistance, elevated glucose and diabetes all influence the blood vessels, the kidneys, the nervous system, the liver and lipoprotein metabolism. This is one of the clearest reasons a cardiovascular evaluation should include more than cholesterol.

HOW THE CHAIN RUNS Insulinresistance Higher glucoseand insulin Downstreamchanges Greaterrisk THE DOWNSTREAM CHANGES Endothelial dysfunctionOxidative stressInflammationElevated triglycerides Lipoprotein compositionHigh blood pressureKidney diseaseClotting risk Useful markers may include fasting glucose, HbA1c, fasting insulin, triglycerides,waist circumference, blood pressure, liver markers and kidney function.

How the chain runs

1
Insulin resistance
2
Higher glucose and insulin
3
Downstream changes
4
Greater cardiovascular risk

The downstream changes

Endothelial dysfunction

Oxidative stress

Inflammation

Elevated triglycerides

Changes in lipoprotein composition

High blood pressure

Kidney disease

Increased clotting risk

Useful markers may include fasting glucose, HbA1c, fasting insulin, triglycerides, waist circumference, blood pressure, liver markers and kidney function.

Heart health and metabolic health are deeply connected. Blood Sugar and Metabolic Health covers this side of the picture in full.

One contributor, not the verdict

Inflammation belongs in the story. It is not the whole story.

Atherosclerosis involves inflammatory activity within the arterial wall. That does not mean a single inflammatory marker can diagnose cardiovascular disease. C-reactive protein may add risk information in selected patients, but it is nonspecific and can rise because of infection, injury, autoimmune disease, obesity or other inflammatory conditions entirely unrelated to the arteries.

01
Read it alongside the lipoproteins
Inflammation modifies how particle burden should be weighed. It does not replace it.
02
Read it alongside pressure and glucose
Both influence inflammatory signalling and both are independently treatable.
03
Read it alongside smoking and kidney function
Two established contributors that change the interpretation considerably.
04
Read it alongside family history and age
The same value means different things at different starting points.
05
Read it alongside existing disease
If plaque is already documented, the question has already moved on.
06
Read it alongside imaging when appropriate
Imaging answers a different question than any blood marker can.

The useful question is not do I have inflammation. It is whether inflammation meaningfully changes how my cardiovascular risk should be understood or managed.

Vascular response

Nitric oxide helps blood vessels respond.

Nitric oxide is one of several molecules that help blood vessels relax and regulate circulation. Healthy endothelial cells produce it in response to chemical signals and to the movement of blood across the vessel wall, which supports vasodilation, blood pressure regulation, tissue perfusion, exercise responses, vascular repair and reduced platelet activation.

Its biology can be influenced by physical activity, blood pressure, blood sugar, smoking, oxidative stress, ageing, vascular disease and dietary patterns.

Nitric oxide is important. It is not a stand alone diagnosis, not a substitute for cardiovascular risk assessment, and not a reason to build treatment around one supplement. The larger objective is to maintain vessels capable of responding appropriately.

How a vessel answers demand

Response

HEALTHY RESPONSE Flow increases, the lining signals, the vessel widens. REDUCED RESPONSE Less dilation, greater stiffness, less perfusion.

Healthy response

Flow increases, the lining signals, the vessel widens.

Reduced response

Less dilation, greater stiffness, less perfusion.

Nitric oxide supports vasodilation, pressure regulation, perfusion, exercise response and repair. It is not a diagnosis on its own.

Not the same problem

The heart and the blood vessels require different evaluation.

A person can have a structurally normal heart with significant vascular disease. Another can have serious heart disease without atherosclerosis. Lifestyle and metabolic care matter across many of these conditions, and they do not replace cardiology evaluation, imaging, rhythm monitoring, medication, procedures or surgery when those are needed.

Vascular

The arteries themselves

Coronary artery disease, carotid artery disease, peripheral artery disease, aortic disease, cerebrovascular disease and venous thromboembolism.

Heart muscle

The pump itself

Cardiomyopathy, heart failure and myocarditis. The muscle may weaken, stiffen or become inflamed without any plaque being involved.

Electrical

Rhythm and timing

Atrial fibrillation, supraventricular tachycardia, ventricular arrhythmias and bradyarrhythmias. These are problems of signalling, not supply.

Valves

Flow through the chambers

Aortic stenosis, mitral regurgitation, valve prolapse and congenital valve abnormalities. Structure rather than circulation.

Different parts of the cardiovascular system require different forms of evaluation and treatment.

Two different starting points

Cardiovascular disease can be silent.

Some people experience warning symptoms. Others do not know disease is present until a significant event occurs. Those two situations call for different responses, and the absence of symptoms is not the same as the absence of disease.

Where warning symptoms are present, the priority is evaluation matched to the severity and speed of those symptoms. Where there are none, the work is risk assessment and prevention built from history, measurements, laboratory testing and, when it is justified, selected imaging.

The symptom patterns below are worth recognising. They require appropriate medical evaluation. They should not be diagnosed from a website.

Patterns by territory

Recognising

CORONARY Chest pressure or tightness Shortness of breath Pain to arm, jaw, back or upper abdomen Nausea, sweating, unusual fatigue CEREBROVASCULAR Sudden facial or limb weakness Numbness on one side Difficulty speaking or understanding Sudden visual change or loss of balance PERIPHERAL AND HEART FAILURE Leg discomfort with walking Coldness, weak pulses, slow healing wounds Swelling of the legs, rapid fluid weight gain Breathlessness lying flat or waking at night

Coronary

Chest pressure or tightness

Shortness of breath

Pain to arm, jaw, back or upper abdomen

Nausea, sweating, unusual fatigue

Cerebrovascular

Sudden facial or limb weakness

Numbness on one side

Difficulty speaking or understanding

Sudden visual change or loss of balance

Peripheral and heart failure

Leg discomfort with walking

Coldness, weak pulses, slow healing wounds

Swelling of the legs, rapid fluid weight gain

Breathlessness lying flat or waking at night

A vascular clue

Erectile dysfunction can be an early circulation signal.

Erectile function depends in part on healthy blood flow and vascular responsiveness. In some men, erectile dysfunction appears before coronary symptoms, because the penile arteries are smaller than the coronary arteries and a given degree of vascular change shows up there sooner.

01
It is not automatically cardiovascular
Diabetes, neurological conditions, low testosterone, medication effects, psychological factors, pelvic surgery and smoking can all contribute.
02
It may still justify a broader look
Particularly where other risk factors are present, it is a reasonable prompt to assess metabolic and vascular risk properly.
03
It belongs in the conversation
Sexual health is health information. Leaving it out of a cardiovascular history removes a genuinely useful signal.

The starting point

Family history changes where the assessment begins.

Family history can raise cardiovascular concern even when current symptoms are absent. It does not guarantee the same outcome. What it changes is the threshold for evaluation, the timing of screening and how assertively risk factors are managed.

PATTERNS THAT MATTER Heart attack or stroke at a young ageElevated Lp(a) Familial hypercholesterolemiaSudden unexplained death Very high LDL cholesterolCardiomyopathy Aortic diseaseInherited arrhythmia syndromes Multiple affected close relatives WHAT GENES MAY INFLUENCE Lipoproteins · blood pressure · clotting · heart structure · electrical rhythm · response to environment

Patterns that matter

Heart attack or stroke at a young age

Familial hypercholesterolemia

Very high LDL cholesterol

Elevated Lp(a)

Sudden unexplained death

Cardiomyopathy

Aortic disease

Inherited arrhythmia syndromes

Multiple affected close relatives

Genes may influence lipoproteins, blood pressure, clotting, heart structure, electrical rhythm and how the body responds to environmental conditions.

Owning your biology includes knowing the cardiovascular story you inherited.

Pattern over nutrient

There is no single perfect heart diet.

The strongest dietary patterns tend to share a set of features rather than a set of rules. Minimally processed foods, vegetables and fruit, legumes, nuts and seeds, adequate fibre, unsaturated fats, fish where appropriate, limited trans fat, limited excess sodium, limited refined carbohydrate, limited ultra processed food, and energy intake matched to the person.

WHAT A MEAL CAN INFLUENCE Blood sugarTriglyceridesBlood pressureSatiety Body compositionThe microbiomeInflammationLipoprotein metabolism Diet should be adapted to metabolic health, kidney function, medications, blood pressure, food access, preference and culture. The objective is not to obsess over one nutrient.

What a meal can influence

Blood sugar

Triglycerides

Blood pressure

Satiety

Body composition

The microbiome

Inflammation

Lipoprotein metabolism

Diet should be adapted to metabolic health, kidney function, medications, blood pressure, food access, preference and culture.

The best cardiovascular diet is not the one with the most rules. It is the one that consistently improves the person’s risk profile and can be sustained.

Replacement matters

Saturated fat requires context.

Saturated fat can raise LDL cholesterol in many people, although the size of that response varies considerably between individuals. The health effect of changing intake depends partly on what replaces it, and a dietary pattern rich in vegetables, legumes, nuts, fish and minimally processed foods should not be judged by one isolated nutrient.

01
Replaced with unsaturated fat and fibre rich foods
This is the substitution most consistently associated with improved cardiovascular risk.
02
Replaced with refined starch or sugar
The benefit may not appear at all, and other markers may move in the wrong direction.
03
Replaced with nothing, at lower energy intake
A different intervention again, with effects that run mostly through body composition.
04
Food source, not just nutrient
The wider dietary pattern carrying the fat changes what the change actually does.

The practical questions are what the person is eating now, what will replace the saturated fat, how their LDL, ApoB, triglycerides, blood sugar and blood pressure respond, and whether the change is sustainable. For the longer discussion see Bad Fats or Facts? Saturated Fat and the Diet Heart Hypothesis.

Trainable

Movement trains the vascular system.

Exercise is one of the most direct ways to challenge and strengthen cardiovascular function. Regular movement supports blood pressure regulation, insulin sensitivity, glucose control, lipoprotein metabolism, endothelial function, cardiorespiratory fitness, muscle mass, stress regulation, sleep and long term independence. Cardiorespiratory fitness is itself an important health indicator.

01
Begin
Start from current conditioning rather than from an ideal. The first dose is the one that gets repeated.
02
Build
Add volume before intensity. Most of the cardiovascular return comes from consistent moderate work.
03
Adapt
Vessels, muscle and metabolism adjust to demand that is repeated, not to demand that is occasional.
04
Recover
Adaptation happens between sessions. Recovery capacity is part of the prescription, not an afterthought.

The right dose depends on current conditioning, existing cardiovascular disease, symptoms, blood pressure, joint and neurological limitations, medication, recovery capacity and medical clearance where that is appropriate. The goal is not maximal intensity for everyone. It is progressive, sustainable capacity.

Overnight and ongoing

Sleep and stress reach the cardiovascular system.

Sleep regulates more than alertness. Inadequate or disrupted sleep can influence blood pressure, appetite, blood sugar, sympathetic nervous system activity, inflammation, recovery, food choices and exercise capacity.

Sleep apnoea deserves particular attention, because repeated interruptions in breathing can contribute to hypertension, rhythm disturbances, daytime fatigue and cardiovascular risk. It is common, frequently undiagnosed, and treatable.

Psychological stress affects blood pressure, sleep, behaviour, autonomic balance and medication adherence. Stress is not the sole cause of heart disease. But the body does not separate emotional experience from cardiovascular physiology.

What sleep touches

Overnight

WHAT SLEEP INFLUENCES Blood pressureAppetite Blood sugarRecovery Sympathetic activityFood choices InflammationExercise capacity SLEEP APNOEA Hypertension Rhythm disturbance Daytime fatigue Common, often undiagnosed, and treatable.

What sleep influences

Blood pressure

Appetite

Blood sugar

Recovery

Sympathetic activity

Food choices

Inflammation

Exercise capacity

Sleep apnoea

Hypertension

Rhythm disturbance

Daytime fatigue

Common, often undiagnosed, and treatable.

Exposure

Smoking and air exposure matter.

Tobacco exposure can injure the vascular lining, increase clotting risk, accelerate atherosclerosis and reduce oxygen delivery. The cardiovascular effect is not limited to cigarettes. Nicotine products, secondhand smoke and other inhaled exposures may also matter, and air pollution contributes another environmental layer. The goal is not environmental perfection. It is exposure reduction where the evidence and the person’s history justify it.

Stopping tobacco use remains one of the highest value cardiovascular interventions available.

Where inhaled and environmental exposure is a larger part of the picture, Environmental Medicine covers how exposure and capacity are assessed.

Above the neck

Oral health belongs in the cardiovascular conversation.

The mouth is part of the body. Periodontal disease creates chronic local inflammation and has been associated with cardiovascular risk. Bleeding gums, persistent swelling, loose teeth, pain with chewing and chronic bad breath all deserve dental evaluation. Treating gum disease should not be advertised as a cure for atherosclerosis, and oral health is still a legitimate part of whole person cardiovascular care.

The heart health plan should not begin at the neck and ignore everything above it.

Five layers

What a cardiovascular evaluation can include.

Not every layer applies to every person. The layers exist so that testing follows the clinical question rather than the other way around.

Story Measurements Foundational labs Risk refinement Imaging and function Symptoms, family history, smoking, prior events, pregnancy history, exercise tolerance, sleep, medication, diet, alcohol, stress Blood pressure, resting heart rate, waist circumference, pulse quality, signs of impaired circulation, heart and lung examination Lipid panel, complete blood count, blood sugar markers, kidney function, liver markers, electrolytes, thyroid testing when indicated ApoB, Lp(a), high sensitivity C-reactive protein, fasting insulin, urine albumin, additional lipid or metabolic testing ECG, echocardiogram, rhythm monitoring, stress testing, coronary calcium scoring, CT angiography, carotid imaging, ankle brachial index 0102030405 No one needs every cardiovascular test. The test should match the question.

Five layers

1
StorySymptoms, family history, smoking, prior events, pregnancy history, exercise tolerance, sleep, medication, diet, alcohol, stress
2
MeasurementsBlood pressure, resting heart rate, waist circumference, pulse quality, signs of impaired circulation, heart and lung examination
3
Foundational labsLipid panel, complete blood count, blood sugar markers, kidney function, liver markers, electrolytes, thyroid testing when indicated
4
Risk refinementApoB, Lp(a), high sensitivity C-reactive protein, fasting insulin, urine albumin, additional lipid or metabolic testing
5
Imaging and functionECG, echocardiogram, rhythm monitoring, stress testing, coronary calcium scoring, CT angiography, carotid imaging, ankle brachial index

No one needs every cardiovascular test. The test should match the question.

What the foundational panel covers, and why reference ranges are not the same as optimal ranges, is set out in Comprehensive Blood Chemistry. For the fuller assessment discussion see How to Properly Assess for Cardiovascular and Heart Disease.

A refinement tool

What coronary calcium scoring can and cannot tell you.

A coronary artery calcium scan is a low dose CT test that detects calcified plaque within the coronary arteries. The result can help refine cardiovascular risk in selected adults when a treatment decision remains genuinely uncertain.

A score of zero can be reassuring in some contexts. It does not guarantee the absence of all plaque, and it does not eliminate risk from smoking, diabetes, strong family history, symptoms or other high risk conditions. A higher score indicates a greater burden of calcified coronary plaque.

It is a risk refinement tool. It is not a universal screening requirement for every person, and the result should be interpreted alongside age, symptoms, lipids, blood pressure, diabetes, smoking, family history and kidney function.

Risk and disease

Different questions

ESTIMATED RISK HistoryBlood pressureLaboratory markersFamily historyRisk calculation EVIDENCE OF DISEASE Coronary calciumCT angiographyStress testingAnkle brachial indexEchocardiography Risk markers estimate probability. Imaging may reveal whether disease is already present.

Estimated risk

History

Blood pressure

Laboratory markers

Family history

Risk calculation

Evidence of disease

Coronary calcium

CT angiography

Stress testing

Ankle brachial index

Echocardiography

Risk markers estimate probability. Imaging may reveal whether disease is already present.

Restraint

More testing is not always better testing.

Large cardiovascular panels can produce impressive reports without improving the decision. Every marker should answer a defined question, and six questions asked before ordering usually prevent a great deal of confusion afterwards.

01
What am I trying to determine?
If the question cannot be stated plainly, the result will be hard to act on.
02
Is the test validated for that purpose?
Many markers are real biology without being validated decision tools.
03
Will the result change treatment?
The most useful filter of all, and the one most often skipped.
04
Is there a more direct way to assess this?
Sometimes a blood pressure cuff answers what a panel only gestures at.
05
Could the result create confusion without action?
An unactionable abnormal result still costs the person something, usually worry.
06
Does the person already meet criteria for treatment?
If the decision is already made, the extra test is not refining anything.

The best cardiovascular assessment is not the one with the most biomarkers. It is the one that most clearly identifies risk and guides the next decision.

Both, in proportion

Medication and whole person care are not opponents.

Statins reduce cholesterol synthesis and lower circulating LDL cholesterol. For many patients, particularly those with established atherosclerotic cardiovascular disease or sufficiently elevated risk, they reduce the likelihood of future cardiovascular events. A functional approach should not begin with the assumption that statins are unnecessary, and it should not reduce cardiovascular health to medication alone.

MEDICAL RISK REDUCTION Lipid lowering therapy Blood pressure treatment Diabetes medication Antiplatelet therapy when indicated Cardiology and procedures DAILY RISK REDUCTION Nutrition Physical activity Sleep Smoking cessation Metabolic health and stress Comprehensive prevention Do not stop or change prescribed cardiovascular medication without speaking to the prescribing clinician.

Two kinds of risk reduction

Medical risk reduction

Lipid lowering therapy

Blood pressure treatment

Diabetes medication

Antiplatelet or anticoagulant therapy when indicated

Cardiology, procedures and cardiac rehabilitation

Daily risk reduction

Nutrition

Physical activity

Sleep

Smoking cessation

Metabolic health, stress and medication adherence

Where they overlap is comprehensive prevention. Do not stop or change prescribed cardiovascular medication without speaking to the prescribing clinician.

The goal is not to choose between medication and lifestyle. It is to use every appropriate tool in proportion to the person’s risk.

The decision depends on existing disease, overall estimated risk, LDL cholesterol, ApoB and Lp(a) where relevant, diabetes, family history, blood pressure, smoking status, imaging, age, preference and tolerance of medication. For a fuller treatment of how statins work and how to weigh the tradeoffs, see Statin Drugs: Are They Worth the Risks?

The sequence I use

How I evaluate cardiovascular risk.

This is a clinical sequence, not a self diagnosis tool. It exists to keep prevention, risk refinement and active disease from being confused with one another.

01
Determine whether this is prevention or active disease
There is a large difference between a healthy person assessing future risk, a person with several risk factors, a person with known plaque, a person with angina or peripheral artery disease, a person recovering from a heart attack or stroke, and a person with heart failure, arrhythmia or valve disease. The stage determines both the urgency and the type of care required.
02
Identify established risk factors
Blood pressure, lipids and ApoB where appropriate, blood sugar and diabetes, smoking, kidney disease, family history, age, existing vascular disease, physical activity, body composition, sleep and sleep apnoea, and pregnancy related history where relevant.
03
Look for evidence of existing disease
Symptoms, examination, imaging, calcium scoring, stress testing or rhythm monitoring may be appropriate depending on the clinical picture. Risk markers estimate probability. Imaging or functional testing may show whether disease is already present. They answer different questions.
04
Understand the surrounding physiology
Insulin resistance, inflammation, thyroid function, kidney function, digestive and nutritional status, sleep, fitness, environmental exposure, oral health and medication effects. These do not replace standard cardiovascular assessment. They help explain the person around the risk calculation.
05
Match the intervention to the risk
Lower risk prevention may emphasise nutrition, movement, sleep, smoking cessation, blood pressure improvement, metabolic health and appropriate monitoring. Higher risk care may also require medication, imaging, cardiology consultation, procedures, cardiac rehabilitation and closer surveillance.
06
Monitor the response and coordinate care
Reassess what actually moved, adjust in proportion, and involve specialty care where the picture calls for it rather than after it has escalated.

The more immediate the risk, the less appropriate it is to rely on slow lifestyle change alone.

Call emergency services

Some cardiovascular symptoms are an emergency.

These symptoms need emergency care, not an appointment and not a form. Do not drive yourself when a heart attack, stroke, pulmonary embolism or other cardiovascular emergency is possible. New symptoms should not be dismissed because a person is young, fit, or has previously had normal cholesterol.

Chest pressure, squeezing, fullness or pain

Sudden shortness of breath

Pain into the arm, shoulder, jaw, neck, back or upper abdomen

Sudden sweating with chest discomfort

Fainting

A new rapid or irregular heartbeat with weakness

Sudden facial drooping

One sided weakness or numbness

Sudden speech difficulty

Sudden vision loss

Sudden severe headache

Sudden loss of balance

Coughing blood with chest pain or breathlessness

A suddenly cold, pale, painful or numb limb

Free guide

Understand your risk before a number defines the story

What cholesterol does, how LDL cholesterol and ApoB differ, why blood pressure and blood sugar matter, when additional testing helps, what coronary calcium scoring can and cannot tell you, how medication and lifestyle work together, and which questions to bring to your clinician.

Return to the library

Explore all health conditions

Every condition guide, organised by system, each one written to explain the physiology before the protocol.

Own your biology

Heart health is not one number.

It is not simply cholesterol. It is not simply blood pressure. And it is not simply whether someone feels symptoms today. Cardiovascular health reflects the condition of the heart, the vessel wall, the blood moving through it and the metabolic environment surrounding the entire system.

Owning your biology here means keeping five pairs of things apart, because most of the confusion in cardiovascular care comes from collapsing one of them.

Cholesterol from lipoprotein risk The molecule is essential. The particle burden is what accumulates in a wall over a lifetime.

Risk markers from existing disease One estimates probability. The other reports what is already there.

Prevention from emergency care Slow change is the right answer for one and the wrong answer for the other.

Lifestyle support from necessary medication They are not competitors, and the proportion should follow the risk.

One elevated result from the complete pattern A single number rarely decides anything on its own.

Bring the whole picture, not just the panel.

No pressure, and nothing to buy. Bring your lipid results, your blood pressure readings, any imaging you have had, your family history, what you are taking and what has already been tried, and we can work out together what your numbers actually mean and what belongs in the next decision.

Common questions

Questions about heart health.

Short, plain answers to what people ask most about cholesterol, statins, calcium scoring and prevention.

Is high cholesterol always bad?
A cholesterol number on its own does not settle very much. Cholesterol is biologically necessary, and the same LDL value can mean different things in a young person with no other risk factors and in someone with diabetes, high blood pressure and a family history of early heart disease. What matters is the whole risk picture: how many atherogenic particles are circulating, how long the exposure has lasted, what else is present, and whether there is already evidence of plaque. So the honest answer is that elevated cholesterol is meaningful but not self interpreting, and it should not be read in isolation or ignored because one other marker looks reassuring.
What is the difference between LDL cholesterol and ApoB?
LDL cholesterol estimates how much cholesterol is being carried inside LDL particles. ApoB estimates how many atherogenic particles are present, because each of those particles carries one ApoB molecule. Usually the two agree. They can separate when triglycerides are high, or in insulin resistance, diabetes and metabolic syndrome, where a person may carry many smaller particles holding less cholesterol each. In that situation LDL cholesterol can look acceptable while particle number is higher than expected. ApoB adds information. It does not replace blood pressure, blood sugar, smoking history, family history or imaging.
Should everyone get a coronary calcium scan?
No. Coronary calcium scoring is a risk refinement tool, not a universal screening test. It is most useful in selected adults where the treatment decision is genuinely uncertain and the score would change what happens next. If someone already meets criteria for treatment, or already has known cardiovascular disease, the scan is unlikely to change the plan. A score of zero can be reassuring in some contexts but does not eliminate risk from smoking, diabetes, strong family history or current symptoms, and a higher score indicates a greater burden of calcified plaque that still needs interpreting alongside everything else.
Can atherosclerosis be reversed?
The honest answer is that meaningful plaque regression is not the usual outcome, and anyone promising routine reversal through supplements or lifestyle alone is overstating what is known. What is well supported is that risk can be reduced substantially: plaque can be stabilised, progression can be slowed, and the likelihood of an event can fall considerably with appropriate treatment of blood pressure, lipoproteins and blood sugar, with smoking cessation, and with sustained changes in movement, nutrition and sleep. That is a genuinely valuable outcome, and it is a different claim from reversal.
Does saturated fat cause heart disease?
Saturated fat raises LDL cholesterol in many people, though the size of the response varies a lot between individuals. The more useful question is what replaces it. Replacing saturated fat with unsaturated fats and fibre rich foods is the substitution most consistently associated with improved cardiovascular risk. Replacing it with refined starch or sugar may produce no benefit at all. Food source and the wider dietary pattern matter too, which is why a single nutrient is a poor way to judge a way of eating.
My cholesterol is normal. Can I still have heart disease?
Yes. Cardiovascular risk is shaped by blood pressure, blood sugar, smoking, kidney function, family history, age, inflammation and lipoprotein exposure over time, not by one panel taken once. Subclinical atherosclerosis has been documented in people whose LDL cholesterol was not elevated. That is not an argument that cholesterol is unimportant. It is an argument that a normal lipid panel is not a clean bill of cardiovascular health, particularly where other risk factors, symptoms or a strong family history are present.
Should I stop my statin and try lifestyle instead?
That is not a decision to make from a website, and it is not a decision to make alone. Statins reduce the likelihood of future events for many people, particularly those with established atherosclerotic disease or sufficiently elevated risk. Lifestyle change is valuable and it is not a substitute for medication in someone whose risk warrants treatment. If you want to revisit a prescription, do it with the clinician who prescribed it, with your current numbers in front of you. Do not start, stop or change any cardiovascular medication on your own.
What tests assess heart disease risk beyond cholesterol?
Depending on the person and the question, an evaluation may add ApoB, Lp(a), high sensitivity C-reactive protein, fasting insulin, HbA1c and urine albumin to the foundational panel, alongside repeated blood pressure measurement and kidney and liver markers. Where symptoms or risk justify it, imaging and functional testing answer a different question again: electrocardiogram, echocardiogram, rhythm monitoring, stress testing, coronary calcium scoring, CT angiography, carotid imaging or ankle brachial index. No one needs all of them. The test should follow the question.

References

Sources behind this page

These are the sources consulted in writing this guide. They include work that disagrees with itself on how strongly lipoproteins drive risk, which is an accurate reflection of the literature rather than an oversight.

  1. Alizadeh-Fanalou, S., Nazarizadeh, A., Alian, F., et al. (2020). Small dense low-density lipoprotein-lowering agents. Biological Chemistry, 401(10), 1101-1121. https://doi.org/10.1515/hsz-2019-0426
  2. Alphonse, P. A. S., & Jones, P. J. H. (2016). Revisiting human cholesterol synthesis and absorption. Lipids, 51(5), 519-536. https://doi.org/10.1007/s11745-015-4096-7
  3. Blesso, C. N., & Fernandez, M. L. (2018). Dietary cholesterol, serum lipids, and heart disease: Are eggs working for or against you? Nutrients, 10(4), 426. https://doi.org/10.3390/nu10040426
  4. Fernández-Friera, L., Fuster, V., López-Melgar, B., et al. (2017). Normal LDL-cholesterol levels are associated with subclinical atherosclerosis in the absence of risk factors. Journal of the American College of Cardiology, 70(24), 2979-2991. https://doi.org/10.1016/j.jacc.2017.10.024
  5. Ference, B. A., Kastelein, J. J. P., & Catapano, A. L. (2020). Lipids and lipoproteins in 2020. JAMA, 324(6), 595. https://doi.org/10.1001/jama.2020.5685
  6. Goldstein, J. L., & Brown, M. S. (2015). A century of cholesterol and coronaries: From plaques to genes to statins. Cell, 161(1), 161-172. https://doi.org/10.1016/j.cell.2015.01.036
  7. Greenland, P., Blaha, M. J., Budoff, M. J., Erbel, R., & Watson, K. E. (2018). Coronary calcium score and cardiovascular risk. Journal of the American College of Cardiology, 72(4), 434-447. https://doi.org/10.1016/j.jacc.2018.05.027
  8. Hooper, L., Martin, N., Abdelhamid, A., & Davey Smith, G. (2015). Reduction in saturated fat intake for cardiovascular disease. Cochrane Database of Systematic Reviews. https://doi.org/10.1002/14651858.CD011737
  9. Jensen, M. K., Bertoia, M. L., Cahill, L. E., et al. (2014). Novel metabolic biomarkers of cardiovascular disease. Nature Reviews Endocrinology, 10(11), 659-672. https://doi.org/10.1038/nrendo.2014.155
  10. Libby, P., Buring, J. E., Badimon, L., et al. (2019). Atherosclerosis. Nature Reviews Disease Primers, 5(1), 56. https://doi.org/10.1038/s41572-019-0106-z
  11. Parsons, C., Agasthi, P., Mookadam, F., & Arsanjani, R. (2018). Reversal of coronary atherosclerosis: Role of lifestyle and medical management. Trends in Cardiovascular Medicine, 28(8), 524-531. https://doi.org/10.1016/j.tcm.2018.05.002
  12. Ravnskov, U., de Lorgeril, M., Diamond, D. M., et al. (2018). LDL-C does not cause cardiovascular disease: A comprehensive review of the current literature. Expert Review of Clinical Pharmacology, 11(10), 959-970. https://doi.org/10.1080/17512433.2018.1519391
  13. Sachdeva, A., Cannon, C. P., Deedwania, P. C., et al. (2009). Lipid levels in patients hospitalized with coronary artery disease. American Heart Journal, 157(1), 111-117.e2. https://doi.org/10.1016/j.ahj.2008.08.010
  14. Vernooij, R. W. M., Zeraatkar, D., Han, M. A., et al. (2019). Patterns of red and processed meat consumption and risk for cardiometabolic and cancer outcomes. Annals of Internal Medicine, 171(10), 732-741. https://doi.org/10.7326/M19-1583

Dr. Daniel Gonzalez, DC
Dr. Daniel Gonzalez, DC, functional medicine physician and chiropractor.
Reviewed by Dr. Daniel Gonzalez, DC.

This page is educational and is not medical advice. Nothing here diagnoses any condition, and nothing described is a treatment or cure for any illness. It explains how a functional medicine physician thinks about cardiovascular risk, testing and whole person context, always to be interpreted alongside your own history, symptoms and findings by a qualified clinician. Do not start, stop or change any medication, including cardiovascular medication, on the strength of a web page. If you have symptoms that concern you, are acutely unwell, or have any of the emergency signs listed above, call emergency services rather than reading further.
Baseline Health