LDL cholesterol ('bad cholesterol') is the primary driver of atherosclerotic cardiovascular disease. The goal of cholesterol-lowering is to reduce LDL — ideally below 3.0 mmol/L (116 mg/dL) for low-risk individuals and below 1.4 mmol/L (55 mg/dL) for those with established heart disease. Diet can reduce LDL by up to 20–30%; statins reduce it by 30–60%.
The dietary changes with the strongest evidence
Not all dietary advice for cholesterol has equal evidence behind it. The following changes are supported by randomised trials and are consistently recommended across major cardiovascular guidelines.
| Dietary change | Approximate LDL reduction |
|---|---|
| Replacing saturated fat with unsaturated fat | 8–12% |
| Eating soluble fibre (oats, barley, legumes) | 5–10% |
| Adding phytosterol-enriched foods | 7–10% |
| Eating soy protein (25 g/day) | 3–6% |
| Consuming nuts (especially almonds, walnuts) | 3–5% |
Saturated fat: the key swap
Saturated fat raises LDL by suppressing LDL receptor activity. The major dietary sources are butter, full-fat dairy, fatty meat and coconut oil. Replacing these with olive oil, rapeseed oil, nuts and avocado — sources of mono- and polyunsaturated fats — consistently reduces LDL in controlled studies.
The word 'replacing' is key. Adding olive oil on top of a diet already high in saturated fat produces minimal benefit. The effect comes from substitution.
Soluble fibre
Soluble fibre forms a gel in the gut that binds to bile acids (which are made from cholesterol) and removes them in stool. The liver must then use LDL cholesterol to make more bile acids — lowering circulating levels. Oats, barley, lentils, beans, apples and psyllium husk are all excellent sources.
Aim for 10–15 g of soluble fibre per day to achieve a meaningful cholesterol reduction. A bowl of porridge provides roughly 3–4 g; a can of lentils provides around 5 g.
What doesn't work as clearly as claimed
Red yeast rice contains monacolin K — chemically identical to lovastatin — and does lower LDL, but doses are inconsistent across supplements and it carries the same muscle and liver side effects as statins. Omega-3 supplements lower triglycerides effectively but have a minimal effect on LDL. 'Low-cholesterol' labels on food are largely marketing — dietary cholesterol has far less impact on blood cholesterol than saturated fat.
"The most powerful dietary change for LDL is not adding anything — it is replacing saturated fat with unsaturated fat. That substitution changes your lipid profile predictably."
Dr. Lina Haddad, CMO, Looms
When lifestyle alone is not enough
For individuals with familial hypercholesterolaemia, established cardiovascular disease, or LDL that remains above target after 3 months of consistent lifestyle change, statins are the recommended first-line pharmacological treatment. Statins are among the most studied and safest drugs in medicine. Lifestyle change and medication are not alternatives — they are most effective together.