The major risk factors ranked
Hypertension (high blood pressure)
Hypertension is the single largest attributable risk factor for cardiovascular disease globally. It affects approximately 30% of UK adults, and around half of those with it are undiagnosed. The relationship between blood pressure and cardiovascular risk is continuous — there is no threshold below which risk disappears, and each 20mmHg increase in systolic BP doubles cardiovascular mortality risk.
Smoking
Smoking roughly doubles the risk of coronary heart disease and significantly increases stroke risk. The good news: quitting smoking produces one of the fastest measurable risk reductions of any lifestyle change — within 1 year of quitting, coronary heart disease risk halves; within 15 years, it approaches that of never-smokers.
High LDL cholesterol
LDL cholesterol (the 'bad' cholesterol) drives atherosclerotic plaque formation. The relationship between LDL and cardiovascular risk is log-linear — lower is better with no apparent floor. Dietary changes can reduce LDL by 10–20%; statins can reduce it by 30–50%.
Type 2 diabetes
People with type 2 diabetes have 2–4× the cardiovascular risk of non-diabetics, driven by the combined effects of insulin resistance, inflammation, and accelerated atherosclerosis. Good glycaemic control substantially reduces but does not eliminate this excess risk.
Blood pressure, LDL cholesterol, blood glucose and BMI are the four most clinically actionable numbers for cardiovascular risk. If you don't know yours, getting them checked is the single highest-value health action most adults can take.
The most powerful modifiable interventions
Exercise
Regular physical activity reduces cardiovascular mortality by approximately 35%, independent of other risk factors. The dose-response relationship is strong — more is better, and even small increases from a sedentary baseline produce substantial benefits.
Diet
The PREDIMED trial — a large RCT — found that a Mediterranean diet supplemented with olive oil or nuts reduced major cardiovascular events by approximately 30% compared to a low-fat diet, in high-risk individuals.
Weight management
Obesity is an independent cardiovascular risk factor. A 5–10% reduction in body weight produces meaningful improvements in blood pressure, cholesterol, and glycaemic control.
Quitting smoking, if applicable, produces the largest single-intervention risk reduction for cardiovascular disease of any lifestyle change — outweighing diet improvements, exercise, and even statin therapy in smokers. If you smoke, stopping is the priority above all else.
Cardiovascular risk factor impact summary
| Risk Factor | Relative Risk Increase | Modifiability |
|---|---|---|
| Hypertension (>140/90) | 2–4× increase | High — diet, exercise, medication |
| Smoking | ~2× increase | High — quitting highly effective |
| High LDL cholesterol | 1.5–3× increase | High — diet + statins |
| Type 2 diabetes | 2–4× increase | Moderate — glycaemic control helps |
| Physical inactivity | ~2× increase | Very high — highly responsive to change |
| Obesity (BMI>30) | ~1.5× increase | Moderate — weight loss helps |
| Family history | 1.5–2× increase | None — fixed |
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