Can you lower cholesterol in 30 days with food?

Yes. A measurable LDL drop can show within about 4 weeks of a real change: in a 4-week feeding study the full Portfolio diet lowered LDL by about 29%. Everyday eating gets less, about 13% over 6 months, so a retest at 6 to 12 weeks gives a fairer read than one at 30 days.

What is the fastest way to lower cholesterol with food?

Cut saturated fat first (butter, fatty meat, coconut oil) and cook with unsaturated oils, then stack oats or psyllium, a sterol-fortified food, nuts and soy every day. The full Portfolio combination (sterols, nuts, soy and soluble fibre on a diet low in saturated fat) lowered LDL by about 29% in 4 weeks when all food was provided; at home, expect less.

What is the best breakfast for lowering cholesterol?

Porridge from rolled or steel-cut oats is the best-studied breakfast for LDL. A 60 g bowl gives about 2.4 g of beta-glucan, most of the 3 g a day that lowered LDL by about 7 mg/dL (0.19 mmol/L) in a meta-analysis of 58 trials. Adding nuts or soy milk adds to the effect; oat milk alone gives much less beta-glucan.

Are eggs bad for cholesterol?

For most people, an egg a day has a small effect on LDL compared with saturated fat, and US guidance no longer sets a fixed daily cholesterol cap. Some people's LDL rises noticeably with eggs, and the AHA advises people with high cholesterol, especially with diabetes, to eat them more sparingly.

Is cheese bad for cholesterol?

Cheese raises LDL less than the same amount of fat eaten as butter, but it is still high in saturated fat, so portions matter. A small amount of a strong-flavoured cheese fits a cholesterol-lowering diet; large daily portions work against it.

Are avocados and peanut butter good for cholesterol?

Yes, as swaps. Both are mostly unsaturated fat, so avocado on toast instead of butter, or peanut butter instead of cheese, lowers your saturated fat intake. Choose peanut butter without added palm oil.

Does keto lower cholesterol?

A keto diet often lowers triglycerides but can raise LDL, sometimes sharply, especially when it is high in butter, cream and fatty meat. If your LDL is high and you are trying keto, it is worth asking your doctor about rechecking LDL and ApoB within a few months.

Do I need supplements to lower cholesterol?

Most of the LDL-lowering effect comes from food: unsaturated oils in place of saturated fat, oats or barley, beans, nuts, soy and sterol-fortified foods. Psyllium has good trial evidence for LDL; fish oil lowers triglycerides but not LDL. People with very high LDL or high heart risk usually need prescribed medicine alongside diet, and supplements are no substitute for it.

Foods that lower cholesterol: what works, how much, and how fast

The distinctions

01
A pattern moves LDL; a single food barely does
Each cholesterol-lowering food shaves off a few percent of LDL. Swapping out saturated fat and stacking three or four of the proven foods together is what reaches a drop of around 10 to 15% in everyday life (13% in the 6-month Portfolio trial ¹), and about 29% when every meal is provided ¹⁰. The combined effect is smaller than the sum of the parts.

If a lipid panel has just told you your LDL (the cholesterol that builds up in artery walls) is high, food can lower it, and two changes do most of the work: cooking with unsaturated oils instead of butter and fatty meat, and eating more soluble fibre from oats, barley, beans and psyllium. US and European guidelines both start with diet ⁶ ¹¹. Most lists of cholesterol-lowering foods give twenty items and no numbers, so you cannot tell a daily oat habit worth 7 mg/dL from a cup of green tea worth close to nothing. Below, the foods are ranked by how much they moved LDL in trials, with the amounts used and the point where food stops and medicine starts. New to the numbers? Start with <a href="/learn/how-to-read-your-lipid-panel">how to read your lipid panel</a>.

About 13%LDL drop on the Portfolio diet over 6 months13.1 to 13.8% across two levels of dietary advice, versus 3.0% on a low-saturated-fat diet, in 351 adults with high LDL ¹

Which foods lower LDL the most

The table ranks foods and swaps by how strongly the trial evidence supports an LDL drop, with the amount eaten in those trials. The drops are averages across many people; your own result depends on what you eat now and on your genes. Where a study reported a percentage, the mg/dL figure assumes a starting LDL of 130 mg/dL (3.4 mmol/L).

Food or swap	Amount used in trials	Typical LDL drop	Evidence	Easiest way in
Unsaturated oils in place of saturated fat	Olive, rapeseed (canola) or sunflower oil replacing butter, lard, coconut oil and fatty meat	The largest single dietary effect; size depends on how much saturated fat you start with ⁵ ⁶	Strong	Cook in oil, swap butter for oil or nut butter
Oats and barley (beta-glucan, their soluble fibre)	3 g beta-glucan a day: about 75 g dry rolled oats, or 40 g oat bran	About 7 mg/dL (0.19 mmol/L) ²	Strong	Porridge, barley in soups and stews
Psyllium husk	About 10 g a day (median in trials)	About 13 mg/dL (0.33 mmol/L) ³	Strong	Stirred into water or yogurt with a full glass of fluid
Plant sterol or stanol-fortified foods	About 2 g a day, eaten with a meal	8 to 10%, about 10 to 13 mg/dL (0.26 to 0.34 mmol/L) ⁴	Strong for LDL; no heart-attack outcome trials, so NICE does not recommend them for preventing heart disease ¹⁷	Fortified yogurt drink or spread with lunch or dinner
Tree nuts	About 28 g a day (a small handful)	About 5 mg/dL (0.12 mmol/L) ⁷	Moderate	Almonds or walnuts as the afternoon snack
Soy foods	About 25 g soy protein a day	About 3 to 4%, around 4 to 5 mg/dL (0.12 mmol/L) ⁸	Moderate	Tofu, edamame, soy milk in place of dairy or meat
Beans, lentils, chickpeas	About 130 g cooked (roughly one serving) a day	About 6.5 mg/dL (0.17 mmol/L) ⁹	Moderate	Half the mince in a chilli or bolognese swapped for lentils

CalculatorCholesterol converterYour report in mmol/L and this table in mg/dL? Convert your LDL in one step.Work it out

The drops in the table do not add up neatly. Each food works partly through the same pathway (more LDL receptors on the liver), so stacking five of them gives less than the sum. In the 6-month Portfolio trial, people eating nuts, soy protein, soluble fibre (oats, barley, psyllium) and plant sterols together got about 13% ¹. From 130 mg/dL (3.4 mmol/L), that is about 17 mg/dL (0.44 mmol/L).

How LDL responds to a cholesterol-lowering diet over 6 months

Portfolio dietLow-saturated-fat diet

Illustrative curves, not study data points. The 6-month endpoints follow Jenkins et al. 2011 (JAMA): about 13% on the Portfolio diet versus 3% on the control diet ¹. The early fall reflects the 4-week Portfolio feeding study ¹⁰.

01Why these foods work

Why soluble fibre and saturated fat matter most

LDL in the blood falls when the liver pulls more of it out, and the liver does that through LDL receptors on its surface. Saturated fat turns the number of those receptors down, so LDL lingers in the blood. Replacing saturated fat with unsaturated oil turns them back up. The American Heart Association's 2017 advisory on dietary fats put it plainly:

Lowering intake of saturated fat and replacing it with unsaturated fats, especially polyunsaturated fats, will lower the incidence of CVD.Sacks FM et al., AHA Presidential Advisory on Dietary Fats and Cardiovascular Disease, Circulation 2017 ⁵

In the core randomised trials behind that advisory, swapping saturated fat for polyunsaturated vegetable oil cut cardiovascular disease by about 30%, a size similar to statins ⁵. Soluble fibre, meaning the kind that turns to gel in water (oats, barley, beans, psyllium), works through bile, as the pathway below shows. Plant sterols work a third way: they compete with cholesterol for absorption in the gut, so less cholesterol reaches the liver ⁴.

How soluble fibre pulls LDL out of your blood

Fibre forms a gel

Beta-glucan from oats or psyllium thickens into a gel in the small intestine.

The gel traps bile acids

Bile acids, which the liver makes from cholesterol, get caught in the gel and leave in the stool instead of being reabsorbed.

The liver makes more bile

To replace the lost bile acids, the liver uses up its own cholesterol stores.

LDL receptors go up

Short of cholesterol, the liver adds LDL receptors and pulls more LDL out of the blood.

Mechanism as described in the oat beta-glucan ² and psyllium ³ meta-analyses; the same pathway explains why fibre's effect shows within weeks.

Is oatmeal good for cholesterol?

Oatmeal (porridge) lowers LDL when you eat enough beta-glucan, the soluble fibre in oats. A meta-analysis of 58 trials found that 3 g or more of oat beta-glucan a day lowered LDL by about 0.19 mmol/L (7 mg/dL), and also lowered non-HDL cholesterol and apolipoprotein B (ApoB, a count of the particles that carry cholesterol into artery walls) ². The US FDA allows a heart health claim on foods that give at least 3 g a day of beta-glucan from whole oats or barley ¹⁹.

Rolled oats are about 4% beta-glucan, so 3 g takes roughly 75 g of dry oats, nearly twice a typical 40 g bowl. Oat bran is richer: about 40 g gets you there. Rolled and steel-cut oats keep the beta-glucan long and thick; heavily processed instant oats tend to have shorter, thinner beta-glucan that forms a weaker gel, and in some trials worked less well. Barley is the other source with the same claim, and pearl barley in a soup counts.

Porridge counts toward the 3 g; oat milk mostly does not

Porridge (rolled or steel-cut oats)✓ Counts toward the 3 g

a 60 g bowl

Beta-glucan per servingAbout 2.4 g

Servings to reach 3 gAbout one and a quarter bowls, or one bowl plus barley or oat bran later

Gel strengthThick, intact beta-glucan

Oat milkNot a reliable source

a 250 mL glass

Beta-glucan per servingOften about 1 g or less; check the label

Servings to reach 3 gThree or more glasses for most brands

Gel strengthOften broken down by enzymes during processing

Typical values; brands vary, so check the label. The 3 g target is the FDA claim threshold ¹⁹ and the dose in the meta-analysis ².

Fruit, vegetables, whole grains and other fibre foods

Apples, citrus fruit and berries carry pectin, a soluble fibre; aubergine and okra are rich in gummy fibre; avocado is mostly unsaturated fat; ground flaxseed brings both fibre and unsaturated fat. Whole grains such as rye, wholewheat and brown rice add fibre too. None of these has a trial-backed dose like oats or psyllium, and each one alone moves LDL only a little. They help by raising your total soluble fibre and by taking the place of foods high in saturated fat. The UK target is 30 g of fibre a day for adults, and the average adult eats under 20 g ¹⁶. In a large review of cohort studies and trials, people eating 25 to 29 g of fibre a day had 15 to 30% less heart disease and early death than those eating the least ¹⁵.

Foods to avoid with high cholesterol, and what to swap them for

Taking out the foods that push LDL up does as much as adding the ones that pull it down. European guidelines rank cutting saturated and trans fat as the dietary change with the largest LDL effect ⁶. The swaps below keep the meal and change the fat.

Raises LDL	Why	Swap to
Butter and ghee	High in saturated fat	Olive or rapeseed oil; nut butter on toast
Coconut and palm oil	Mostly saturated fat, despite the health halo	Sunflower, rapeseed or olive oil
Fatty and processed meat (sausages, bacon, salami, fatty mince)	Saturated fat, plus salt	Beans, lentils, tofu, chicken, fish; half-and-half mince with lentils
Cream and full-fat ice cream	Saturated fat	Plain yogurt, lower-fat crème fraîche
Large amounts of hard cheese	Saturated fat (cheese raises LDL less than the same fat as butter, but still raises it)	Smaller portions of a strong-flavoured cheese
Pastries, biscuits, cakes	Saturated and sometimes trans fat, little fibre	Oatcakes, fruit, a handful of nuts
Deep-fried takeaway and anything listing partially hydrogenated oil	Trans fat raises LDL and lowers HDL	Oven-baked or air-fried versions
Unfiltered coffee (French press, Scandinavian boiled, Turkish)	Coffee oils (cafestol) raise LDL; a paper filter removes most of them	Paper-filtered, drip or instant coffee

What about eggs, shellfish and dietary cholesterol?

For most people, cholesterol in food raises blood LDL far less than saturated fat does, and the European guidelines rate cutting dietary cholesterol as a small effect ⁶. US dietary guidance dropped its fixed 300 mg daily cap in favour of eating patterns low in saturated fat, and the AHA's 2019 advisory on dietary cholesterol says healthy people can include up to an egg a day ¹⁴. The same advisory says people with high cholesterol, especially those with diabetes, should be more cautious with eggs ¹⁴; so should people with <a href="/conditions/familial-hypercholesterolemia">familial hypercholesterolaemia</a> (an inherited condition in which the liver clears LDL poorly). Prawns and other shellfish carry cholesterol but very little saturated fat, so they are a reasonable swap for red meat.

Foods that get credit they do not earn for LDL

Oily fish is good for the heart, but salmon, mackerel and sardines lower <a href="/biomarkers/triglycerides/high">triglycerides</a>, not LDL; the omega-3 fats EPA and DHA act on triglycerides ¹². Eat oily fish for its own benefits and as a swap for red meat, which is where it helps LDL. Green tea, garlic, apple cider vinegar and red wine each have small or inconsistent effects on LDL in trials, too small to count on if your number is high.

02Putting it on a plate

What a cholesterol-lowering day of eating looks like

This sample day follows the Portfolio idea: replace saturated fat, then fit oats or barley, nuts, soy and a sterol-fortified food into ordinary meals. The amounts are approximate and the foods are easy to find in the US and the UK.

Meal	What	What it adds
Breakfast	Porridge from 60 g rolled oats with berries; filtered coffee	About 2.4 g beta-glucan
Snack	30 g almonds	One daily nut serving
Lunch	Lentil and pearl barley soup; rye bread with olive oil; a plant sterol-fortified yogurt drink	About 1 g beta-glucan, a legume serving, 1.5 to 2 g plant sterols
Dinner	Tofu and vegetable stir-fry in rapeseed oil, brown rice	About 15 to 20 g soy protein; unsaturated fat
Evening	Soy yogurt or a bowl of edamame	About 5 to 10 g more soy protein
Day total		Over 3 g beta-glucan, a nut serving, about 25 g soy protein, about 2 g sterols; saturated fat low

How fast can diet lower cholesterol?

In a 4-week controlled feeding study where all food was provided, the Portfolio diet lowered LDL by about 29%, close to the 31% seen with the statin lovastatin ¹⁰. Everyday results are smaller (about 13% in the 6-month trial ¹) because people do not eat the full pattern at every meal. Either way, food changes show on a blood test within weeks. A fair retest, which your doctor can order, is 6 to 12 weeks after a change you have kept up, at the same lab, under the same fasting conditions as last time. Look past total cholesterol: LDL, non-HDL cholesterol (total minus HDL) and ApoB are the numbers food is meant to move, and oat beta-glucan lowers all three ². If your LDL looks fine but ApoB is high, <a href="/compare/apob-vs-ldl">ApoB vs LDL</a> explains which to trust, and <a href="/biomarkers/apolipoprotein-b/high">high ApoB</a> covers what to do. One retest can be noise, so the trend over two or three panels tells you more; see <a href="/learn/trends-beat-single-readings">why a trend beats a single reading</a>.

The numbers to compare before and after

LDL cholesterolThe number every food in this guide was tested against Non-HDL cholesterolCatches all the artery-clogging cholesterol, including what LDL misses Apolipoprotein BCounts the particles; can stay high when LDL looks fine TriglyceridesWhere oily fish and cutting sugar and alcohol show up

Free, no accountRead your blood testGot a before and after lipid panel? Read both, line by line, free, and see which numbers moved.Read my results

03Where food stops

When food will not be enough

A 10 to 15% drop is a real change, but it will not bring a very high LDL into range. US guidelines say an LDL of 190 mg/dL (4.9 mmol/L) or higher should prompt assessment for <a href="/conditions/familial-hypercholesterolemia">familial hypercholesterolaemia</a> ¹¹, and European guidelines suspect it above 5 mmol/L ⁶. Diet still helps there, alongside medication.

Where an example LDL of 172 mg/dL sitsmg/dL

172 mg/dLhigh · same as 4.4 mmol/L

Optimal0–100Near optimal100–130Borderline high130–160High160–190Very high190–240

A 13% food-driven drop would take 172 to about 150 mg/dL (3.9 mmol/L), which moves it from high to borderline high. Whether that is enough depends on your overall heart risk, which your doctor can estimate.

Bands are the standard US cholesterol bands (NCEP ATP III) that most lab reports print ¹⁸; 190 mg/dL is also the point at which US guidelines advise checking for familial hypercholesterolaemia ¹¹.

At your next appointment, ask for your 10-year heart risk estimate, whether ApoB and Lp(a) have been checked, and when to retest after your diet change.

Lipoprotein(a), a cholesterol particle that is mostly set by your genes, barely responds to food ¹³; see <a href="/biomarkers/lipoprotein-a/high">high Lp(a)</a>. Very low-carb diets can raise LDL sharply in some people; see the <a href="/learn/keto-diet">keto diet guide</a>. People already at high risk usually need a statin or another medicine alongside diet, and the <a href="/conditions/high-cholesterol">high cholesterol</a> page explains how that decision is made. For pills sold for cholesterol, the evidence is ranked on <a href="/supplements-for/heart-health">supplements for heart health</a>.

Medicines and supplements people ask about

Strongest evidenceStatinsLower LDL by 30 to 50% or more and cut heart attacks; diet adds to the effect

Strong for triglycerides onlyOmega-3 (fish oil)Lowers triglycerides; does not lower LDL In our shop

Mixed evidenceBerberineLowered LDL modestly in some trials; interacts with several medicines, so check with your doctor or pharmacist first In our shop

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Citations

Educational context only, not medical advice or a diagnosis. Always discuss your results with a clinician.