Quick answer: the two eating patterns with the strongest evidence behind them for heart patients are DASH and the Mediterranean diet. Both work on the same principles: more vegetables, fruit, whole grains, pulses, nuts and fish; less sodium, saturated fat, refined carbohydrate and processed meat. The sodium target that matters most is 2,300 mg a day, or 1,500 mg if your doctor advises it. If you already take heart medication, read the interactions section below before changing anything, because several common heart drugs interact with food in ways that matter.
Read This First If You Already Take Heart Medication
This is the section most heart-diet articles leave out, and it is the one most likely to affect you. Several routine heart medicines interact with food, and a few of the changes people make in good faith after reading a diet article are the exact changes that cause problems.
| If you take | What to know |
|---|---|
| Warfarin | Vitamin K affects how warfarin works. The goal is consistency, not avoidance. Suddenly adding large amounts of spinach, kale or other leafy greens because a diet article recommended them can shift your INR. Keep your intake steady and tell your anticoagulant clinic if you plan a significant dietary change. |
| ACE inhibitors, ARBs, or spironolactone (names often ending in -pril or -sartan) | These raise blood potassium. Low-sodium salt substitutes are usually potassium chloride, so swapping to one can push potassium too high. This is a common and genuinely dangerous mistake. Ask your doctor or pharmacist before using any salt substitute. |
| Statins | Grapefruit and grapefruit juice interact with some statins, raising blood levels and the risk of side effects. It does not affect all statins equally, so check which one you are on rather than assuming. |
| Diuretics (water tablets) | Some lower potassium and some raise it, in opposite directions. Do not act on general advice to eat more or less potassium without knowing which type you take. |
| Treatment for heart failure | You may have a specific fluid restriction as well as a sodium target. Fluid limits are individual and are set by your cardiology team, not by a website. |
None of this means the advice below does not apply to you. It means the safest first step is a short conversation with your pharmacist, who can check your specific medicines in a couple of minutes at no cost.
When to Seek Medical Help Rather Than Change Your Diet
Diet is prevention and long-term management. These are emergencies:
- Chest pain or pressure, particularly with sweating, nausea, breathlessness, or pain spreading to the arm, jaw, neck or back. Call emergency services immediately. Symptoms in women, older adults and people with diabetes are more often atypical, presenting as unusual fatigue, breathlessness or indigestion-like discomfort rather than classic crushing chest pain.
- Sudden breathlessness, or breathlessness lying flat that wakes you at night.
- Rapid weight gain of two to three kilograms over a few days with swelling in the ankles or abdomen, if you have heart failure. This usually indicates fluid retention and needs same-day contact with your team.
- Fainting, or palpitations with light-headedness.
The Two Patterns Worth Following
DASH
DASH stands for Dietary Approaches to Stop Hypertension, and it was developed with support from the US National Heart, Lung, and Blood Institute. It is built around vegetables, fruit, whole grains, low-fat dairy, fish, poultry, beans, nuts and vegetable oils, while limiting fatty meats, full-fat dairy, sugary drinks, sweets and sodium.
Its evidence base is unusually good for a dietary pattern. Trials found that adults following DASH lowered blood pressure within weeks even without changing sodium, and that cutting sodium as well produced larger reductions. The plan specifies a sodium limit of 2,300 mg per day, or 1,500 mg where a lower target is appropriate. It also lowers LDL cholesterol.
The Mediterranean pattern
Broadly similar, with more emphasis on olive oil, nuts, fish and pulses, and less on low-fat dairy. It has good evidence for reducing cardiovascular events and is often easier to sustain because it is a cuisine rather than a prescription.
You do not need to choose between them. They overlap heavily, and the differences matter far less than whether you can keep it up for years. Both can be adapted to Indian, South Asian, Mediterranean or any other cuisine: the principles travel even when the specific foods do not.
Sodium: The Number That Does the Most Work
For most heart patients, sodium reduction is the single highest-yield dietary change, and it is also the one people get wrong, because most sodium does not come from the salt shaker.
- The bulk of it is already in the food. Bread, cheese, cold meats, ready meals, packet soups, sauces, pickles, papad, namkeen, savoury snacks and restaurant food account for far more than home cooking does.
- Read the label per 100 g, not per serving. Serving sizes are chosen by manufacturers and are often unrealistically small. As a rough guide, more than 1.5 g of salt per 100 g is high; less than 0.3 g is low.
- Sodium and salt are not the same number. Salt is roughly 2.5 times the sodium figure, so 1 g of sodium is about 2.5 g of salt. Labels vary in which they use.
- Taste adapts. Salt preference recalibrates over a few weeks. Reducing gradually works better than a sudden cut you abandon.
- Replace, do not just remove. Lemon, vinegar, garlic, ginger, black pepper, chilli, herbs and toasted spices carry flavour without sodium.
- Be careful with salt substitutes, for the potassium reason explained above.
What to Eat More Of
Vegetables and fruit
The foundation of both patterns. They supply fibre, potassium, magnesium and antioxidants. Aim for variety and colour rather than tracking individual nutrients. Frozen counts, and is often cheaper and no less nutritious than fresh.
Whole grains and fibre
Oats, barley, brown rice, whole wheat, millets and quinoa retain the bran and germ that refined grains lose. Soluble fibre, particularly from oats, barley and pulses, modestly lowers LDL cholesterol. This is one of the few dietary changes with a direct, measurable effect on a blood test.
Pulses, nuts and seeds
Lentils, chickpeas, kidney beans and black beans deliver fibre and protein with no saturated fat. A small daily handful of unsalted nuts is associated with better cardiovascular outcomes. Buy them unsalted, which matters more here than usual, and keep portions modest because they are energy-dense.
Oily fish
Salmon, mackerel, sardines, herring and trout supply long-chain omega-3 fats. Two portions of fish a week, at least one of them oily, is the common guideline figure. Note that whole fish has better supporting evidence than omega-3 supplements, which have produced mixed trial results. Do not start a supplement without asking your doctor, particularly if you take an anticoagulant.
Unsaturated fats
Olive oil, rapeseed oil, mustard oil, avocado, nuts and seeds. The useful move is replacing saturated fat with unsaturated fat rather than simply eating less fat overall, since low-fat diets that substitute refined carbohydrate do not help.
What to Cut Back
- Saturated fat from fatty meat, butter, ghee, full-fat dairy, and tropical oils including coconut, palm and palm kernel oil. Coconut oil is marketed as heart-healthy and is not: it is high in saturated fat and raises LDL cholesterol.
- Trans fats from partially hydrogenated oils, vanaspati, and some commercial baked goods and fried foods. These are the worst category and many countries have restricted them.
- Processed and red meat. Cold cuts, sausages and bacon carry both saturated fat and a large sodium load.
- Refined carbohydrate and added sugar, particularly sugary drinks, which contribute calories without satiety.
- Alcohol. Current guidance has moved away from the idea that moderate drinking protects the heart. Less is better, and if you have an arrhythmia, cardiomyopathy or high blood pressure, discuss it specifically with your cardiologist.
A Realistic Day
An example rather than a prescription. Portion sizes depend on your calorie needs, which depend on your body size and activity level.
| Meal | Example | Why |
|---|---|---|
| Breakfast | Oats or porridge with fruit and a few unsalted nuts | Soluble fibre, no added sodium |
| Lunch | Whole grain or millet base, a large portion of vegetables, dal or beans, curd | Fibre and plant protein, low saturated fat |
| Snack | Fruit, or a small handful of unsalted nuts | Replaces the savoury packet snack that carries most of the day’s sodium |
| Dinner | Grilled or baked fish or pulses, two vegetables, small whole grain portion | Omega-3 and volume without heavy energy density |
| Cooking | Olive, rapeseed or mustard oil. Season with lemon, herbs and spices instead of extra salt | Replaces saturated fat and reduces sodium |
Beyond Food
- Physical activity, guided by your cardiologist and ideally through a cardiac rehabilitation programme if you have had an event or procedure. Cardiac rehab has strong evidence and is significantly under-used. Ask whether you are eligible.
- Stopping smoking, which delivers a larger and faster cardiovascular benefit than any dietary change on this page.
- Taking your medication as prescribed. Diet supports treatment; it does not replace statins, blood pressure medication or anticoagulants, and stopping them because your diet has improved is a serious risk.
- Sleep and stress, both of which influence blood pressure. See our guide on how stress affects your weight for the mechanism.
- Weight, if you carry excess. Even modest loss improves blood pressure and lipids. Our sustainable weight loss guide covers approaches that hold up.
Terms You May Hear
| Term | What it means |
|---|---|
| DASH | Dietary Approaches to Stop Hypertension. An eating plan developed to lower blood pressure |
| LDL cholesterol | Often called bad cholesterol. The main lipid target in cardiovascular prevention |
| Triglycerides | Another blood fat, raised by excess alcohol and refined carbohydrate |
| Saturated fat | Fat mainly from animal products and tropical oils, which raises LDL cholesterol |
| Trans fat | Industrially produced fat from partially hydrogenated oil. The most harmful fat type |
| Sodium versus salt | Salt weighs roughly 2.5 times its sodium content. Labels may state either |
| INR | A blood test measuring how quickly blood clots, monitored in people taking warfarin |
| Cardiac rehabilitation | A supervised exercise and education programme after a cardiac event or procedure |
Frequently Asked Questions
The DASH eating plan and the Mediterranean pattern have the strongest evidence. Both centre on vegetables, fruit, whole grains, pulses, nuts, fish and unsaturated oils, while limiting sodium, saturated fat, refined carbohydrate and processed meat. They overlap heavily, so pick whichever fits your cuisine and routine, because sustaining it for years matters far more than the choice between them.
The DASH plan sets a sodium limit of 2,300 mg a day, with 1,500 mg used where a lower target is appropriate. In salt terms that is roughly 5.8 g and 3.8 g respectively, since salt weighs about 2.5 times its sodium content. Most sodium comes from processed and restaurant food rather than the salt shaker, so reading labels per 100 g achieves more than removing salt from cooking.
Not always, and this is an important one. Most low-sodium salt substitutes are potassium chloride. If you take an ACE inhibitor, an ARB, spironolactone or certain diuretics, your blood potassium may already run high, and a salt substitute can push it higher. Ask your doctor or pharmacist before using one rather than assuming a product marketed as heart-healthy is safe for you.
No. The goal is consistency rather than avoidance. Vitamin K in leafy greens affects how warfarin works, so what causes problems is a sudden large change in intake, not the vegetables themselves. Keep your intake reasonably steady and tell your anticoagulant clinic before making a significant dietary change so your INR can be monitored.
No, despite the marketing. Coconut oil is high in saturated fat and raises LDL cholesterol. It is grouped with palm and palm kernel oil among the tropical oils that heart-healthy eating plans advise limiting. Olive, rapeseed and mustard oils are better choices for regular cooking.
Eating oily fish has better evidence than taking supplements, and omega-3 supplement trials have produced mixed results. Two portions of fish a week, at least one oily, is the usual guideline figure. Do not start a supplement without asking your doctor, particularly if you take an anticoagulant, since high-dose fish oil can affect bleeding risk.
No, and stopping prescribed medication because your diet or your numbers have improved is a serious risk. Improved blood pressure and cholesterol often reflect the medication working alongside the diet. Any change to statins, blood pressure medication or anticoagulants is a decision for the doctor who prescribed them.
Current guidance has moved away from that idea. The older evidence suggesting moderate drinking protects the heart is now considered weaker than it once appeared. Less is better, and if you have high blood pressure, an arrhythmia such as atrial fibrillation, or a cardiomyopathy, discuss alcohol specifically with your cardiologist rather than relying on general advice.
Sources
- National Heart, Lung, and Blood Institute — DASH Eating Plan.
- NHLBI — Following the DASH Eating Plan, including sodium targets and serving sizes.
- NHLBI — Living with DASH, on lowering sodium when shopping, cooking and eating out.
- MedlinePlus — How to Lower Cholesterol with Diet.
- MedlinePlus — Heart Diseases.
- World Health Organization — Salt reduction.
- NHS — Coronary heart disease: prevention.
Medical disclaimer: Last updated August 2026. This article is general information and is not medical advice, a diagnosis, or a personalised eating plan. It has been reviewed for accuracy by our editorial team but has not been reviewed by a named clinician. If you have diagnosed heart disease, heart failure, or take any cardiac medication, your diet should be agreed with your doctor, cardiologist or a registered dietitian, because targets for sodium, potassium and fluid differ between conditions and treatments. Never stop or change prescribed medication based on anything you read here.
