Heart-Healthy Eating: Foods Cardiologists Recommend

Heart health diet guide — at a glance, here are the most important points to walk away with before you read the deep dive below.

• Up to an estimated 80% of heart attacks and strokes are preventable through lifestyle and dietary changes. • The Mediterranean diet remains the gold standard of cardiac nutrition, backed by landmark trials including PREDIMED, ASCOT and the Lyon Diet Heart Study. • Current evidence on dietary fat is more nuanced than the outdated low-fat guidelines of past decades. • Omega-3 fatty acids, blood pressure and sodium (via the DASH diet), and LDL cholesterol and fibre each have their own well-documented mechanisms of cardiovascular protection. • The Portfolio Diet approach stacks multiple cholesterol-lowering foods together for a cumulative effect greater than any single food alone. • Ultra-processed foods carry documented cardiovascular risk beyond their fat, sugar or sodium content alone, and timing of meals also plays a role beyond plate composition.

No dietary pattern has more robust evidence for cardiovascular protection than the Mediterranean diet. The landmark PREDIMED trial randomised over 7,000 high-cardiovascular-risk adults to one of three diets: Mediterranean diet supplemented with extra-virgin olive oil, Mediterranean diet supplemented with mixed nuts, or a low-fat control diet. The Mediterranean diet groups showed a 30% relative reduction in major cardiovascular events compared to the low-fat group — a magnitude of benefit comparable to many pharmaceutical interventions.

The Mediterranean diet is characterised by high consumption of olive oil, vegetables, legumes, whole grains, nuts, seeds, fruit and fish; moderate consumption of poultry and dairy; and low consumption of red meat, processed meat and added sugars. Its cardiovascular benefits operate through multiple pathways: anti-inflammatory effects of olive oil polyphenols, omega-3 fatty acids from fish improving lipid profiles and reducing arrhythmia risk, soluble fibre from legumes and oats lowering LDL cholesterol, and the overall dietary pattern producing more favourable effects on blood pressure, blood sugar and endothelial function than isolated nutrients could achieve alone. Adopting even the core elements of the Mediterranean pattern — more olive oil, more fish, more legumes, more vegetables — produces measurable cardiovascular benefit.

The dietary fat story has been revised substantially over the past two decades. The original low-fat dietary advice that dominated cardiology from the 1960s to 2000s — based on the hypothesis that all dietary fat raises LDL cholesterol and therefore causes heart disease — has been substantially nuanced. The reality is that fat quality matters far more than fat quantity.

Saturated fat (found in red meat, butter, full-fat dairy, coconut oil, processed foods) raises both LDL (bad) and HDL (good) cholesterol. When it replaces refined carbohydrates in the diet, the effect on cardiovascular risk is roughly neutral. When saturated fat is replaced by unsaturated fat, cardiovascular risk falls. Trans fats (partially hydrogenated vegetable oils, found in some margarines, commercial pastries and fried foods) unambiguously increase cardiovascular risk by raising LDL and lowering HDL simultaneously — these should be minimised to zero. Monounsaturated fat (olive oil, avocados, most nuts) consistently improves lipid profiles and reduces cardiovascular risk. Polyunsaturated fat — particularly omega-6 (sunflower oil, nuts, seeds) and omega-3 (oily fish, flaxseed, walnuts) — reduces LDL, reduces inflammation and lowers cardiovascular risk. The most cardiovascular-protective dietary fat change most people can make is replacing saturated and trans fats with unsaturated fats from olive oil, nuts, seeds, avocado and oily fish.

Omega-3 fatty acids, particularly the long-chain marine forms EPA and DHA found in oily fish, are among the most studied nutrients in cardiovascular medicine. Their proposed mechanisms of cardiovascular benefit include reducing triglycerides (by 20–30% at therapeutic doses), reducing platelet aggregation, decreasing inflammatory markers, modestly lowering blood pressure, reducing cardiac arrhythmia susceptibility, and improving endothelial function.

The evidence for eating oily fish 2–3 times per week and cardiovascular outcomes is strong from observational studies, and supported by mechanistic evidence. The evidence for omega-3 supplements is more mixed: at high doses (4 g/day of prescription-grade EPA or EPA-DHA combinations), randomised trials show significant cardiovascular event reduction in people with elevated triglycerides and high cardiovascular risk. At standard supplement doses (1 g/day), the evidence is less consistent. The dietary recommendation remains clear: oily fish (salmon, mackerel, sardines, anchovies, herring, trout) 2–3 times per week is a robust, food-first approach to obtaining cardiovascular-protective omega-3s. For those who cannot eat fish, algae-based DHA+EPA supplements provide the marine-form omega-3s from the same source that fish themselves obtain them.

High blood pressure (hypertension) is one of the most powerful modifiable cardiovascular risk factors, and diet is one of the most effective interventions to lower it. The DASH (Dietary Approaches to Stop Hypertension) diet was specifically designed to lower blood pressure through dietary change and has been validated in multiple randomised trials showing blood pressure reductions of 8–14 mmHg systolic — comparable in magnitude to a single antihypertensive medication.

The DASH diet emphasises vegetables, fruits, whole grains, low-fat dairy, lean proteins, legumes and nuts, while limiting sodium, red meat, sweets and sugary beverages. Sodium reduction is the most powerful single dietary lever for lowering blood pressure: reducing sodium from the typical Western intake of 3,500–4,000 mg/day to the recommended 1,500–2,300 mg/day reduces systolic blood pressure by 5–10 mmHg on average. Potassium has a complementary blood pressure-lowering effect (via different mechanisms), and increasing potassium intake from vegetables, fruit and legumes reinforces the sodium reduction benefit. Magnesium and calcium (both abundant in DASH-compliant foods) further contribute to blood pressure regulation. Alcohol also raises blood pressure: even moderate consumption (2 drinks/day) raises systolic blood pressure meaningfully, and elimination of alcohol has some of the most reliable blood pressure effects of any dietary change.

LDL cholesterol is the most directly causal of the established cardiovascular risk factors, and diet can lower LDL by a clinically meaningful 10–30% through targeted changes. Dietary cholesterol (from eggs and shellfish) has a much smaller effect on serum LDL than was previously believed, and the longstanding egg restriction advice has been substantially walked back. For most healthy individuals, eating one to two eggs daily has little impact on cardiovascular risk in the context of an otherwise healthy diet.

Soluble fibre is among the most reliably LDL-lowering dietary components. Beta-glucan from oats and barley (3 g/day), psyllium husk and pectin from apples and citrus all lower LDL cholesterol through bile acid sequestration in the gut. Plant sterols and stanols — found naturally in vegetable oils, nuts and seeds, and added to some margarines and yoghurts — block cholesterol absorption from the gut and lower LDL by 10–15% at intakes of 2–3 g/day. Replacing saturated fat with unsaturated fat (as discussed above) is another powerful LDL-reducing dietary change. Soy protein (25 g/day) has FDA recognition for LDL lowering, with typically a 4–6% reduction. Combining these approaches — the 'Portfolio Diet' developed by researcher David Jenkins — can achieve LDL reductions of 25–35%, entering territory that approaches statin-level effects for some individuals.

While much heart-health dietary advice focuses on what to add, what to remove matters equally. Ultra-processed foods — mass-produced items containing multiple additives, emulsifiers, flavour enhancers, preservatives and ingredients not found in domestic kitchens — are now strongly associated with increased cardiovascular risk, independent of their sodium, fat and sugar content. Recent large cohort studies suggest that each 10% increase in ultra-processed food contribution to the diet is associated with a 12% increase in cardiovascular disease risk.

Processed and red meat consumption is consistently associated with higher cardiovascular mortality in large meta-analyses. Processed meat (bacon, sausages, ham, salami, hot dogs) is particularly strongly implicated, likely due to its combined sodium, nitrite, saturated fat and advanced glycation end product content. Reducing processed meat to occasional consumption and replacing it with fish, poultry, legumes or plant protein sources has a reliable cardiovascular benefit. Sugary drinks and ultra-processed snack foods raise triglycerides, lower HDL and promote visceral fat accumulation. Refined carbohydrates more broadly — white bread, white rice, sugary cereals, commercial pastries — have replaced saturated fat as the dietary component most correlated with adverse cardiometabolic outcomes in contemporary diet research.

The Portfolio Diet, developed at the University of Toronto, demonstrates what happens when you combine the individual LDL-lowering foods rather than picking one. The four cornerstones are: nuts (45 g/day, especially almonds and walnuts), plant sterols (2 g/day, from fortified spreads or supplements), viscous fibre (10 g/day from oats, barley, psyllium, beans, and apples), and soy protein (25 g/day from tofu, tempeh, edamame, or soy milk). Each component lowers LDL by 5 to 10 percent in isolation, but when combined, randomised trials have shown 25 to 35 percent LDL reductions in 4 to 6 weeks — entering territory comparable to a moderate statin dose.

A realistic daily Portfolio template: porridge made with oat milk topped with almonds and a tablespoon of psyllium husk for breakfast (covers nuts, viscous fibre, and partial soy); a tofu or edamame stir-fry with vegetables for lunch (soy + plants); apples and an oat-based snack mid-afternoon (viscous fibre); fish or lentils with whole grains and vegetables for dinner; a sterol-fortified yogurt or spread daily. This stacks cleanly on top of a [Mediterranean foundation](/blog/mediterranean-diet-gold-standard/) or a [DASH approach](/blog/dash-diet-hypertension-guide/) — you do not have to abandon a successful pattern to add the Portfolio components. For people with mild-to-moderate LDL elevation who want to try diet-first before statins (with their clinician's agreement), the Portfolio approach has the strongest evidence available.

Two timing-related factors quietly affect cardiovascular risk. First, time-restricted eating (eating within a 10- to 12-hour window during daylight) has emerging evidence for improving lipid profiles, insulin sensitivity, and blood pressure even without changes to total calories — research suggests metabolic benefits from aligning food intake with circadian rhythms. Pulling dinner forward to finish by 7 or 8 pm and not eating again until breakfast captures most of this benefit without aggressive fasting. Second, front-loading calories (substantial breakfast, moderate lunch, smaller dinner) consistently shows better lipid and blood-pressure responses than back-loaded eating in randomised studies — the same total calories produce different cardiovascular markers depending on distribution.

These timing effects pair naturally with the food choices above and require zero additional money or food. They are particularly valuable for people who eat dinner late, snack into the evening, or skip breakfast entirely. Together with daily walking (which after a meal flattens postprandial triglyceride and glucose responses), they amplify the dietary pattern's cardiovascular effect at no extra cost. Move dinner earlier, walk afterwards, and watch the cumulative benefit over six months.

The guidance in this article draws on peer-reviewed nutrition and food-science literature as well as guidance from major public-health bodies. Key reference sources we have consulted while writing and updating this piece include:

• Harvard T.H. Chan School of Public Health, *The Nutrition Source*, 2024. • U.S. National Institutes of Health (NIH), Office of Dietary Supplements, fact sheets, 2024. • World Health Organization (WHO), Healthy Diet fact sheet, 2024. • Cochrane Database of Systematic Reviews — relevant systematic reviews, 2020–2024. • British Dietetic Association (BDA) Food Fact Sheets, 2024.

These references are provided so that motivated readers can verify claims and explore the underlying evidence directly. Where a specific trial, meta-analysis, or named author is referenced in the body of the article, that citation takes precedence over the general sources listed here. The article is reviewed periodically against newly published evidence and updated when meaningful new findings emerge.