Important context before you start
Cardiovascular health is a lifelong project — and the tests that actually predict your risk are different from the ones your standard checkup might run.
What you eat is the foundation. Everything else on this page is an amplifier.
The single biggest lever over your lipids, glucose, blood pressure and long-term cardiovascular risk is what goes on your plate every day — not which supplements you take. The supplement tiers below are genuinely useful, but they work on top of a good diet; they cannot rescue a poor one. If you only change one thing, change how you eat.
And here is the uncomfortable part: most people who are confident they "eat pretty healthily" are partly wrong — usually about refined carbohydrates. Bread, rice, pasta, breakfast cereal, potatoes and "healthy" snacks behave like sugar in the bloodstream, and the effect is almost invisible without measuring it. Two tools cut through the guesswork: the sugar-equivalents comparison in Section 11 (which shows how ordinary starchy meals stack up against a can of cola) and a short CGM trial (Section 9) that reveals your personal glucose response to the foods you actually eat.
Diet does the heavy lifting
Real food, low refined-carb load, oily fish, legumes, vegetables, olive oil. Get this right and the numbers move.
Supplements are helpers
They fine-tune a good diet — omega-3, a sensible multi, magnesium. They never substitute for it.
Move — and push the pace
A gentle stroll helps; brief bursts of genuinely vigorous effort help far more, minute for minute (Section 12).
Track your waist, not the scale
A tape measure around your middle predicts cardiac risk better than weight — and shows progress when the scale doesn't (Section 12).
Heart health begins early — and matters for everyone
Cardiovascular disease is the world's leading cause of death, but the damage doesn't start in middle age — it starts in childhood. Autopsy studies of teenagers and young adults consistently show early fatty streaks and even raised plaques in coronary arteries, even in people who appear completely healthy. Childhood diet, body composition, glucose handling, and sleep patterns lay the metabolic and vascular foundation for the next 60-80 years.
Visible signs of poor diet are not a reliable indicator of cardiovascular trajectory. A slim child eating ultra-processed food, sugary drinks, and refined carbohydrates is depositing the same atherogenic particles into their arterial walls as an overweight adult. Conversely, an overweight child eating a Mediterranean-style diet may have far healthier vasculature than appearances suggest. This guide is intended for adults, but the principles — minimise refined carbohydrate and sugar load, prioritise oily fish and legumes, move daily, sleep well, manage stress — apply at every age.
A word on medication before you read on. In busy real-world practice, statins are often started almost as a matter of course — off a QRISK score and a single standard lipid panel — without first running a genuinely monitored trial of diet and exercise, or the fuller blood work that would show how much risk is really there. Done properly, that means a defined period of supported lifestyle change (refined-carb load, oily fish, daily movement, sleep) with before-and-after blood tests to see how your numbers actually respond, ideally alongside the better risk markers (apoB, Lp(a), hs-CRP, HbA1c — see below) and a coronary-calcium (CAC) scan in borderline cases, plus ruling out treatable causes such as an underactive thyroid. A plan merely mentioned in a ten-minute appointment is not the same as one that is prescribed, supported and measured.
Crucially, this is about borderline, primary-prevention cases — not a reason to refuse or stop a statin. For anyone at genuinely high risk — established cardiovascular disease, a previous heart attack or stroke, familial hypercholesterolaemia, diabetes, or a very high apoB/LDL or Lp(a) — statins are strongly evidence-based and should not be delayed for a lifestyle experiment; the genetic (Mendelian-randomisation) evidence that lowering apoB lowers events is settled. Lifestyle and medication are also not either/or — diet and exercise are the foundation regardless, and you should never start, stop or change a prescribed medicine without discussing it with your GP. The point is simply that the decision should rest on complete information and a fair trial of the basics, rather than being made on autopilot.
For GPs and clinicians reading this: the framework below outlines a structured approach to cardiovascular risk assessment that goes beyond the standard NHS lipid panel. It is designed to identify both the drivers of atherosclerosis (atherogenic particle burden) and the environment that allows those particles to lodge in arterial walls (inflammation, glycation, methylation). Both must be addressed for meaningful risk reduction.
High cholesterol ≠ high arterial plaque
Plenty of people with elevated cholesterol have completely clear arteries, and some people with "normal" cholesterol have advanced plaque. Cholesterol is a risk factor, not a diagnosis. What matters more is whether atherosclerosis is actually present in your vessels — and whether your atherogenic particle count (apoB) is elevated, not just the cholesterol weight inside them.
For a fuller picture, the standard "total cholesterol / LDL / HDL" panel is no longer best practice. ApoB and Lp(a) are now considered superior risk indicators — apoB measures the actual number of atherogenic particles, and Lp(a) is a genetically-driven, highly thrombogenic particle that standard panels miss entirely. If numbers are persistently raised, structural assessment of the arteries may be more useful than chasing lipid numbers down with medication.
One of the most underused diagnostic tools is a 14-day continuous glucose monitor (CGM). Most people genuinely do not realise which of their everyday foods drive the insulin spikes that, in turn, drive hepatic triglyceride production — and triglycerides are the lipid marker most directly tied to diet. A short CGM trial reveals the specific foods, portions, and meal combinations that quietly damage your personal lipid profile. GPs should be recommending a CGM trial far more often than they do, particularly for anyone with persistently raised TG, mixed dyslipidaemia, prediabetes, high HbA1c or metabolic syndrome features. Think of it as a training tool for better eating/drinking with diagnostics. See Section 9 for the full 14-day protocol and target ranges.
The deeper reason this matters: a "normal" cholesterol panel can be false reassurance, because what most often turns cholesterol dangerous is chronically high insulin from repeated blood-sugar spikes — it corrupts your particle quality, glycates the artery wall, and drives the inflammation that lets plaque form. The explainer just below sets out exactly how.
Recommended cardiac assessments
- ECG / Exercise ECGBaseline electrical rhythm; exertional changes (Private:£150-500)
- EchocardiogramStructural assessment of chambers, valves, function (Private:£375)
- Carotid (neck) ultrasoundDirect visualisation of plaque in major arteries (Private:£95)
- CT coronary angiogramLow-radiation direct imaging of coronary arteries (Private:£700-1500)
- Cardiac MRI (T1/T2 mapping)Only if echocardiogram suggests something unclear — detects subclinical inflammation or fibrosis (Private:£800)
Why insulin — not cholesterol alone — decides whether plaque forms
Atherosclerosis needs two things, not one: a seed and a soil. The seed is the atherogenic particle — apoB-carrying LDL and remnants — and it is genuinely necessary: you cannot build arterial plaque without it. But whether those particles actually burrow into the artery wall, oxidise and grow into plaque is decided by the soil — the condition of the wall itself. And the single biggest thing degrading that soil in a modern diet is chronically high insulin, driven by repeated blood-sugar spikes from refined carbohydrate and sugar. This is why someone can have a "normal" cholesterol panel and still be quietly laying down plaque — and why the panel alone is such an incomplete picture of risk.
Insulin corrupts the particles
Chronically high insulin tells the liver to overproduce triglycerides and VLDL — lowering HDL and shifting your LDL towards small, dense particles. Small dense LDL slips through the wall more easily, is retained longer, and oxidises faster than large, buoyant LDL. Two people with the same "LDL cholesterol" can carry very different real risk because of this — which is why apoB (particle count) beats LDL-C.
Sugar spikes glycate the wall
Every glucose spike glycates proteins — both the LDL particle (making it stickier and longer-lived) and the delicate endothelial lining and its protective glycocalyx, the barrier that normally keeps particles out. Your HbA1c is a three-month average of exactly this damage. A glycated, leaky wall is precisely the surface where apoB particles get trapped.
It switches off the wall's defences
Insulin resistance and repeated glucose excursions impair the artery's nitric-oxide "non-stick" coating and switch on adhesion molecules that recruit inflammatory cells into the wall. Inflammation — your hs-CRP — is the accelerant that turns a trapped particle into a growing plaque.
It runs silent for years
The body holds fasting glucose normal by pumping out ever more insulin — so insulin can run high for a decade or more while fasting glucose, and often LDL, still look "fine". The damage accumulates invisibly. Triglycerides and remnant cholesterol on your panel are the earliest fingerprints of this — long before glucose rises.
Essential blood tests for cardiovascular risk
Two tiers of testing that map directly to the two mechanisms of atherosclerosis: direct drivers (the particles that cause plaque) and critical environment (the inflammation and metabolic damage that allows those particles to lodge in arterial walls). Both must be addressed.
The Non-Negotiable Core
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Full lipid panelNHS Baseline Total cholesterol, LDL, HDL, and triglycerides — the standard NHS starting point and what most GPs already order. Triglycerides within this panel are the most actionable marker — they are the premier indicator of dietary response, reacting rapidly to carbohydrate load, insulin resistance, and overall metabolic state. However, the panel alone is no longer sufficient for accurate cardiovascular risk assessment; it must be supplemented with ApoB and Lp(a) below.
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ApoB (Apolipoprotein B)Essential · Private The gold standard, period. Measures the exact number of atherogenic (plaque-causing) particles in your blood — a vastly superior metric to standard LDL-C, which only measures the weight of cholesterol inside those particles. NHS GPs cannot easily order this — typically requires private testing in the UK via onedaytests.com, Medichecks, Thriva, or similar UK private labs. Worth the £20-40 cost — it changes the conversation about your cardiovascular risk.
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ApoA-1 + ApoB:ApoA-1 ratioRecommended · Private Apolipoprotein A-1 is the main protein of HDL particles — measuring it gives a more accurate picture of "good cholesterol" capacity than HDL-C alone. The ApoB:ApoA-1 ratio is arguably the single most predictive lipid risk metric available — established in the AMORIS and INTERHEART studies as a better predictor of cardiovascular events than LDL or the cholesterol ratio. Target ratio: men <0.7, women <0.6. Usually included with ApoB testing on private panels — make sure both are requested together.
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Lp(a) (Lipoprotein(a))Once A highly thrombogenic, genetically determined particle that standard lipid panels completely miss. Because it is genetically driven, you only need to test this once in your life. Sometimes available via NHS with a family history of premature cardiovascular disease, but commonly needs private testing alongside ApoB.
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APOE genotypeOnce · Optional A single gene with three alleles (ε2, ε3, ε4) that profoundly influences lipid response. ε4 carriers respond more to dietary saturated fat (LDL rises more) but also benefit more from Mediterranean intervention. ε2 carriers tend to higher TG and benefit from carbohydrate restriction. Not standard NHS testing — typically accessed via consumer genetic services (23andMe, Nebula Genomics, Living DNA). Once-in-a-lifetime test, and genuinely useful for personalising the dietary approach — but optional rather than essential.
The Critical Environment
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hs-CRPEssential The ultimate marker for systemic inflammation. You can have an aggressively low ApoB, but if hs-CRP is elevated, your residual risk for a cardiovascular event remains high.
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HbA1cEssential A three-month average of blood glucose. High blood sugar glycates (damages) the endothelial lining of blood vessels — creating the precise damage that ApoB particles get stuck in.
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HomocysteineRecommended An inflammatory amino acid that actively scars arterial walls. Managing this metabolic exhaust pathway requires sufficient methylation to recycle homocysteine back into methionine — exactly where TMG does its heavy lifting.
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Liver panel (ALT + GGT + ALP)Essential The liver is the engine of lipid metabolism — it dictates how cholesterol is produced and cleared. GGT in particular is emerging as an independent risk factor for cardiovascular disease and oxidative stress.
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TSH (Thyroid Stimulating Hormone)Essential Thyroid hormones directly control LDL receptor expression on the liver. Hypothyroidism reduces these receptors, causing LDL to back up in the bloodstream — making it one of the most common secondary causes of hyperlipidaemia. UK and international lipid guidelines strongly recommend checking TSH before initiating statin therapy: fixing the thyroid often resolves the cholesterol issue without medication, and statins given in undiagnosed hypothyroidism significantly increase the risk of myopathy.
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Potassium + Sodium (U&E panel)Essential High cholesterol and high blood pressure travel together — both share the same atherogenic mechanism (endothelial damage + LDL infiltration), and treating one without the other leaves cardiovascular risk substantially elevated. Potassium is a core regulator of blood pressure; it directly counterbalances the BP-raising effect of sodium and is routinely measured alongside it as part of the standard U&E (urea & electrolytes) panel that every UK GP can request for free. Both low potassium (<3.5 mmol/L — common with thiazide diuretics, chronic vomiting/diarrhoea, eating disorders) and high potassium (>5.3 mmol/L — common with ACE inhibitors, ARBs, spironolactone, kidney impairment) carry independent cardiovascular and arrhythmia risk. Recent cohort data shows mortality rises even within the "high-normal" 4.6-5.0 mmol/L band in hospitalised patients. If you're being treated for hypertension, potassium should be checked at least annually; it's a single tube of blood that costs the NHS pennies.
Choose what to read next
If you read three
- This page — why a normal panel can mislead you
- The diet chapter — the single biggest lever you have
- Your numbers — read against the range they should sit in
Otherwise the numbering is a reading order, not a requirement. Every chapter defines its own terms, so you can start wherever your question is.
Understand the problem
What is actually going wrong in an artery, and which widely-repeated claims are wrong.
Measure where you stand
The tests worth asking for, what the numbers mean, and how to see plaque directly.
Change something
The interventions that move the numbers, in rough order of how much they move them.
Day to day
Sleep and alcohol — the levers that do not fit into a clinic visit.