Heart Health: How One Cup of Vegetables May Help Protect Your Heart

Heart disease is the world’s leading cause of death, causing millions of deaths each year.

Many things can raise a person’s risk, including high blood pressure, smoking, poor diet, lack of exercise and family history.

Researchers are therefore interested in simple changes people can make to support heart health over many years.

A study led by researchers at Edith Cowan University in Australia suggests that eating nitrate-rich vegetables every day may help.

The research found that people who regularly ate these vegetables had lower blood pressure and a lower risk of several forms of heart disease. The study was published in the European Journal of Epidemiology.

Nitrates are natural substances found in vegetables such as spinach, kale, arugula, beetroot, celery, radishes and turnips. Inside the body, dietary nitrate can help produce nitric oxide, a substance that helps blood vessels relax and widen. Wider blood vessels allow blood to move more easily and can help reduce blood pressure.

Blood pressure matters because the heart must work harder when pressure inside the blood vessels stays too high. Over time, high blood pressure can damage blood vessels and increase the risk of heart attack, stroke and heart failure. Even modest improvements in blood pressure across many years may therefore be important.

The researchers examined health and diet information from more than 50,000 people in Denmark. The participants were followed for more than 20 years, giving the team a chance to compare long-term eating habits with later heart and blood vessel problems. This type of study can identify strong links, although it cannot prove that one food alone caused the difference.

People who ate more nitrate-rich vegetables had systolic blood pressure that was about 2.5 mmHg lower on average. Systolic pressure is the top number in a blood pressure reading and shows the pressure when the heart pumps. The vegetable eaters also had a lower risk of several diseases affecting the heart and blood vessels.

Overall, the researchers reported that higher vegetable nitrate intake was linked to about a 12% to 26% lower risk of cardiovascular disease. One of the largest differences involved peripheral artery disease, which was about 26% less common among people with higher intake. This condition develops when narrowed arteries reduce blood flow, often to the legs.

The study also found links with lower risks of heart attack, stroke and heart failure. Importantly, the researchers did not find that people needed huge servings to see the possible benefits. About one cup of raw nitrate-rich vegetables, or roughly half a cup when cooked, appeared to provide much of the benefit.

That amount can be fairly easy to add to an ordinary diet. A person could put spinach in a salad or sandwich, add leafy greens to a meal, or serve cooked vegetables with dinner. Beetroot, celery and other nitrate-rich vegetables can also help provide variety.

Study leader Dr. Catherine Bondonno said the findings support the idea that simple vegetable choices may contribute to better heart health. Vegetables also provide fiber, vitamins, minerals and many other natural plant compounds, so their benefits are unlikely to come from nitrate alone. Eating them as part of an overall healthy diet remains more important than focusing on a single nutrient.

The findings do not mean that vegetables can replace medicines or medical care for people with high blood pressure or heart disease. They do, however, add to evidence that everyday food choices can influence long-term health. A regular serving of leafy greens and other nitrate-rich vegetables may be one simple way to give the heart and blood vessels extra support.