The most reliably diet-responsive marker.
LDL cholesterol — the 'bad' cholesterol involved in atherosclerosis — can respond to dietary changes within weeks. A 2015 meta-analysis found vegetarian diets lowered LDL by 0.34 mmol/L relative to comparison diets. Larger reductions occurred in some tightly controlled Portfolio Diet trials, but plant-based diets are not generally equivalent to statins.
Saturated fat and dietary cholesterol can raise LDL, although individual responses differ. Major saturated-fat sources include fatty meats, full-fat dairy and coconut and palm oils; dietary cholesterol comes from animal foods. Replacing saturated fat with unsaturated fat can improve LDL clearance. Genetics, health conditions and medicines also influence LDL.
Developed by Dr David Jenkins and colleagues at the University of Toronto, the Portfolio Diet combines soy protein, nuts, viscous fibre and plant sterols. In a 2011 six-month trial, LDL fell by 13.8% and 13.1% in the two Portfolio groups, versus 3.0% with control advice. These are total observed reductions, not guaranteed additions to other dietary effects.
Caldwell Esselstyn reported outcomes in uncontrolled patient series using plant-based diets alongside medical care. Dean Ornish's small randomised Lifestyle Heart Trial found modest regression of coronary narrowing with a vegetarian diet plus exercise, stress management and other changes. These findings do not establish a cure, isolate diet's effect or show that only these diets can help.
"In one four-week controlled trial, the Portfolio Diet lowered LDL by about 29%, compared with about 31% with lovastatin — a short, closely supervised study, not a reason to stop prescribed statins."
Daily: oats or barley, soya milk or tofu, a handful of nuts (especially almonds and walnuts), beans or lentils, vegetables (especially aubergine and okra when in season), berries, ground flax or chia. Add fortified foods or a sterol supplement if your LDL is high and you want to maximise the drop.
Steel-cut oats with soya milk, ground flax, walnuts, berries.
Hummus and roasted vegetable wrap with mixed leaves; an apple.
Tofu and aubergine stir-fry with brown rice and steamed greens.
Almonds, soya yoghurt with chia, fruit, vegetable sticks with hummus.
Average differences versus control diets in randomised trials. Negative = lower. The triglyceride change was not significant, and lower HDL is not a benefit.
mmol/L difference
Wang et al., J. Am. Heart Assoc. 2015
Designed by Jenkins et al.; similar LDL lowering to lovastatin in one four-week controlled trial.
| Add | Daily target | Why |
|---|---|---|
| Plant sterols | 2 g | Block cholesterol absorption |
| Soluble fibre | 10–25 g | Oats, barley, psyllium, beans → bile binding |
| Soy protein | 50 g | Modest LDL-lowering effect |
| Nuts | 30 g | Mono- and polyunsaturated fats displace saturated |
| Whole plant foods (rest of plate) | — | Compound benefit |
Adapted from Portfolio Diet principles; portions shown are not the exact Jenkins et al., JAMA 2003 trial prescription.
LDL cholesterol is a key treatment target, but goals depend on overall risk and the guideline used. ESC/EAS guidance recommends LDL below 55 mg/dL (1.4 mmol/L), plus at least a 50% reduction from baseline, for very-high-risk patients, including those with established atherosclerotic cardiovascular disease. Diet labels alone do not predict an individual's LDL.
Several changes can lower LDL: reducing dietary cholesterol, replacing saturated fat with unsaturated fat, and increasing viscous soluble fibre, which reduces bile-acid reabsorption. Lower saturated-fat intake can improve LDL clearance, not raise LDL. The Portfolio Diet matched lovastatin's LDL reduction in one four-week controlled trial; that result is not general statin equivalence.
Esselstyn's uncontrolled patient series cannot establish what would have happened without the programme. In Ornish's trial, 48 patients were randomised and 35 completed five-year angiography: coronary narrowing decreased by 3.1 percentage points in the intervention group and increased by 11.8 in controls. The programme combined diet with other lifestyle changes, so diet's independent effect was not established.
Average LDL of the whole-food plant-based group over one year. The number of people measured differs between visits.
mmol/L
Wright et al., Nutrition & Diabetes 2017, Table 2
Advice combining several cholesterol-lowering foods reduces LDL more than standard low-saturated-fat advice over six months.
Wang and colleagues find lower total, LDL and non-HDL cholesterol on vegetarian diets than on control diets.
LDL falls in the plant-based programme group during follow-up, though total-cholesterol differences at six months were not significant.
The Portfolio approach combines nuts, soy protein, viscous fibre such as oats and barley, and plant sterols.
Agree when to repeat tests and whether you need medication. Diet changes are not a reason to stop prescribed treatment.
Around 3 g of oat beta-glucan daily can modestly lower LDL. A bowl of oatmeal does not necessarily supply this amount; check the portion and product.
Trials using about one daily serving of pulses found an average LDL reduction of roughly 5% versus control diets. Beans and lentils are filling and affordable, but can cause digestive symptoms.
A handful of almonds or walnuts daily is linked to a 3–7% LDL reduction across dozens of trials.
Soy protein can modestly lower LDL. Studies often use around 25 g daily; the amount supplied by tofu or soya milk varies by product and serving size, so check labels.
Found naturally in vegetable oils, nuts and seeds; fortified spreads can deliver the 2 g/day shown to lower LDL ~10%.
Yes. Saturated fat raises LDL whether from animal or plant sources. Limit coconut oil and palm oil even on a vegan diet.
Egg yolks are a concentrated source of dietary cholesterol and can raise LDL in some people. The effect varies; reducing saturated fat and improving the overall dietary pattern are also important.
Possibly. Statin decisions depend on your overall cardiovascular risk, not just diet or a single LDL result. Established cardiovascular disease and familial hypercholesterolaemia often require medication. Do not stop or change a statin without your prescriber.
Mostly unsaturated, and trials consistently show nuts lower LDL despite the calories. A daily 30 g handful is the trial-supported dose.
Egg yolks are rich in cholesterol, but associations with cardiovascular outcomes vary across studies. A 2019 JAMA pooled analysis associated each additional half egg per day with 6% higher incident cardiovascular disease risk, not cardiovascular mortality. This observational result does not establish causation.
Coconut oil is ~85% saturated fat — higher than butter or lard. It raises LDL significantly. The 'good for you' messaging is a marketing artefact, not a finding.
Decide with your prescriber. Dietary changes complement statins, and a lower LDL does not by itself mean the medicine is no longer needed. This is especially important after a cardiac event. Never reduce or stop a statin on your own.
Lowering elevated LDL generally reduces atherosclerotic cardiovascular risk. If your LDL is unexpectedly very low, discuss the result and your overall health with your clinician.
LDL cholesterol is the most consistent dietary biomarker tracked in nutrition trials, and the plant-based effect is large.
A 2015 meta-analysis of 11 randomised trials found vegetarian diets lowered LDL cholesterol by 0.34 mmol/L (about 13 mg/dL) compared with control diets, with a 95% confidence interval of 0.11 to 0.57 mmol/L.[1]
Jenkins and colleagues (2011) randomised 351 adults with high cholesterol. LDL fell 13.8% with intensive Portfolio advice, 13.1% with routine advice and 3.0% with standard low-saturated-fat advice. The diet combines nuts, soy protein, viscous fibre and plant sterols.[2]
The 2015 meta-analysis found reductions of 0.36 mmol/L in total cholesterol and 0.30 mmol/L in non-HDL cholesterol. HDL fell slightly and triglycerides did not change significantly. Diet can complement treatment; discuss targets and medication with your doctor.[1]
Get a baseline blood test, eat a Portfolio-style diet for 12 weeks, retest. Most readers see substantial LDL reduction.