Dietary Guidance for Heart Health: What the Science Says

Cardiovascular disease (CVD) is the top cause of death worldwide. Science shows that what you eat can be a powerful prevention tool. A good diet can cut your risk of heart disease by 81% to 94%. In contrast, medications usually lower that risk by only 20% to 30%. Still, many people make food choices that harm their heart health over time.

In the United States, more than 80% of healthcare spending is for chronic illnesses, many linked to diet. About 70% of U.S. adults are overweight or obese. One in three has prediabetes. A poor diet causes 45% of deaths from cardiometabolic issues, such as heart disease, stroke, and diabetes.

The good news? The science has never been clearer about what a heart-healthy diet looks like. Here’s what leading health authorities and current research say.

The Foundation: What a Heart-Healthy Diet Looks Like

A heart-healthy dietary pattern centers on: adjusting energy intake to maintain a healthy body weight; eating plenty of varied vegetables and fruits; choosing foods made mostly with whole grains rather than refined grains; selecting healthy protein sources; choosing unsaturated fats over saturated fats; and minimizing added sugars and sodium.

The American Heart Association highlighted the 2025–2030 Dietary Guidelines for Americans. They stress eating more vegetables, fruits, and whole grains. Limit added sugars, refined grains, processed foods, saturated fats, and sugary drinks.

Key Food Groups to Prioritize

Fruits and Vegetables

Fruits and vegetables are packed with vitamins, minerals, and antioxidants. These nutrients boost heart health and lower the risk of heart disease, atherosclerosis, high blood pressure, and high cholesterol. Aim for a range of options, especially dark leafy greens, orange and yellow foods, and berries.

Whole Grains

Whole grains offer dietary fibre that helps maintain healthy cholesterol and blood pressure. Swap refined grains like white bread and rice for brown rice, oats, quinoa, and whole wheat items.

Healthy Proteins

The AHA recommends plant-based proteins, seafood, and lean meats. Cut down on high-fat animal products like red meat, butter, lard, and tallow. They can raise your risk of heart problems.

The AHA suggests eating legumes, nuts, whole grains, lean protein from plants and animals, and fish. Cut back on processed meat, refined carbs, and sugary drinks.

Healthy Fats

Not all fats are equal. People at risk for cardiovascular issues should focus on fats from liquid plant oils, nuts, seeds, avocados, and fatty fish. These are all rich in unsaturated fatty acids. Replace butter and processed oils with olive oil where possible.

The Top Evidence-Based Dietary Patterns

1. The Mediterranean Diet

The Mediterranean diet is the most studied dietary pattern. It has strong evidence showing benefits for heart health. This includes support from large, long-term randomised controlled trials.

The recent CORDIOPREV study found that people with existing CVD had a 27% lower risk of major cardiovascular events on the Mediterranean diet compared to a low-fat diet. The Lyon Diet Heart Study further showed a 50–70% reduction in recurrent CVD events.

The Mediterranean diet includes lots of olive oil, fruits, vegetables, legumes, whole grains, fish, some dairy, and only a bit of red meat.

2. The DASH Diet (Dietary Approaches to Stop Hypertension)

The Mediterranean and DASH diets offer more than just blood pressure control. They also enhance diastolic function, reduce arterial stiffness, and lower oxidative stress. This stress is a key factor in heart failure.

The DASH diet is linked to a lower risk of coronary artery disease and lower LDL cholesterol levels. This plan cuts down on sodium. It adds more foods rich in potassium. It also emphasises low-fat dairy, fruits, vegetables, and whole grains.

3. Plant-Based and Plant-Forward Diets

Plant-forward eating patterns remain the most consistent dietary strategy for reducing cardiovascular risk. Diets such as vegan or mostly plant-based ones can lower blood pressure, boost cholesterol levels, and cut down inflammation.

Choosing an evidence-based dietary pattern should reflect personal preferences, culture, and health needs. Whatever method you choose, focus on more plant-based and minimally processed foods. Cutting back on ultra-processed options is essential for heart-healthy eating.

What to Limit or Avoid

Ultraprocessed Foods

Eating too many nutrient-poor, calorie-dense ultraprocessed foods and drinks leads to many cardiometabolic deaths. The 2025–2030 Dietary Guidelines recommend cutting out added sugars, refined grains, and highly processed foods.

Sodium

Excess sodium raises blood pressure — a major driver of heart disease and stroke. The AHA warns that some federal salt guidelines might cause people to go over recommended sodium limits. This is a major factor in heart disease. The general target is under 2,300 mg of sodium per day (about 1 teaspoon of salt).

Saturated and Trans Fats

Saturated fats are found in butter, full-fat dairy, and fatty red meats. They raise LDL (“bad”) cholesterol. Feeding trials and cohort studies show that saturated fats, especially butter, increase LDL cholesterol more than olive oil or seed oils.

Added Sugars and Sugary Beverages

The AHA advises that children and teens should have less than 6 teaspoons of added sugars each day. They should also limit sugary drinks to no more than 8 ounces a week. For adults, the advice is similar. Too much sugar can lead to weight gain, higher triglycerides, and inflammation.

Special Considerations by Population

• Older Adults: Caloric needs often drop with age, but nutrient density is crucial. Choose whole foods rich in fibre, potassium, calcium, and protein. Also, steer clear of too much sodium and saturated fat.
• People with Kidney Disease: Cardiovascular disease can develop when kidney function declines. These individuals should talk to a doctor or dietitian. They can help with the right amounts of protein and sodium for their condition.
• People with Heart Disease: A stricter Mediterranean or low-fat diet, under a doctor’s guidance, can significantly reduce the risk of recurrence.

Practical Tips to Get Started

You don’t need to change your whole lifestyle all at once. Small, steady changes can lead to the biggest differences over time.

• Swap white rice and bread for whole-grain versions
• Add a handful of nuts or seeds to your daily diet
• Replace one meat-based meal per week with legumes, lentils, or tofu
• Use olive oil instead of butter for cooking
• Cut sugary drinks — replace soda with water, herbal tea, or sparkling water
• Read the Nutrition Facts label on packaged foods to choose options lower in sodium, added sugars, and saturated fat
• Aim for at least 150 minutes of moderate physical activity per week, which compounds the heart benefits of dietary changes

Frequently Asked Questions (FAQs)

Q1: Is a low-fat diet or a Mediterranean diet better for heart health?

Current evidence favors the Mediterranean diet for most people. The Mediterranean diet shows the best evidence for heart health compared to most low-fat diets. However, the best diet is one you can follow consistently.

Q2: Can diet alone prevent heart disease?

Diet is one of the most powerful tools available. Food can greatly affect clinical outcomes. A pill can lower heart disease risk by 20–30%. However, diet alone can cut this risk by 81–94%. A healthy diet, along with exercise, sleep, and not smoking, can greatly lower cardiovascular risk.

Q3: Is red meat completely off the table for heart health?

You can include moderate amounts of lean red meat in a balanced diet. However, limit high-fat animal products like red meat, butter, lard, and tallow. These are linked to a higher risk of heart problems. Plant proteins, fish, and poultry are better regular choices.

Q4: Are eggs bad for the heart?

The science on dietary cholesterol from eggs has evolved. Current AHA guidance says that most people can eat up to 1 egg a day as part of a heart-healthy diet. This is especially true if eggs replace less healthy protein sources.

Q5: What are ultraprocessed foods, and why do they matter?

Ultraprocessed foods are things like packaged snacks, fast food, sugary cereals, sodas, and many ready-to-eat meals. Eating too many calorie-dense, nutrient-light foods raises the 45% of cardiometabolic deaths tied to a poor diet. The 2025–2030 Dietary Guidelines stress the need to reduce their intake.

Q6: What about supplements — do omega-3s or vitamins help the heart?

Whole food sources of omega-3s, like salmon, mackerel, and sardines, are often better than supplements. Isolated vitamin and mineral supplements usually miss the heart benefits of a diet rich in whole foods.

Q7: Does the DASH diet work for people who don’t have high blood pressure?

Yes. The DASH diet does more than lower blood pressure. It boosts diastolic function, cuts arterial stiffness, and fights oxidative stress. This makes it great for anyone wanting to protect their heart health.