Keep heart disease at bay with a salad a day?

Research we're watching

Eating just one cup of leafy green vegetables a day may lower your heart disease risk, suggests a study published online April 21, 2021, by the European Journal of Epidemiology.

The study included more than 53,000 people who took part in the Danish Diet, Cancer, and Health study over a 23-year period. When the study began, their average age was 56, and none had heart disease. Researchers found that people who ate the most nitrate-rich vegetables (especially leafy greens such as spinach and lettuce) had a 12% to 26% lower risk of cardiovascular disease over the course of the study. One cup of greens per day appeared to be the optimum amount, as people who ate higher amounts didn’t further lower their risk.

The heart benefit may stem partly from the slightly lowered blood pressure observed in those participants. During digestion, nitrate found in foods is converted into nitric oxide, a compound that relaxes and widens blood vessels.

While these observational findings can’t prove that leafy greens lower heart disease risk, they jibe with findings from similar studies.