Lean Beef in a Mediterranean Diet May Lower Heart Disease Risk, Study Finds

A new study suggests that lean beef, when eaten as part of a Mediterranean-style diet, may not raise heart disease risk. Researchers found that this combination could even lower blood pressure and reduce harmful TMAO levels compared to a typical Western diet. The trial involved 30 healthy adults testing different meal plans over four weeks each. The randomised controlled trial compared four eating plans. Three followed a Mediterranean-style diet with varying amounts of lean beef: 0.5 oz, 2.5 oz, or 5.5 oz daily. The fourth was a standard Western diet containing about 2.5 oz of non-lean beef per day.

Results showed that all Mediterranean plans, even the one with the highest beef intake, led to lower blood levels of TMAO. This compound has been linked in past studies to a higher risk of heart disease. Urinary TMAO levels also dropped across all Mediterranean diets, including the version with the most beef. Participants on the Mediterranean plans experienced better blood pressure readings than those on the Western diet. The study focused on young, healthy adults, so findings may not extend to older individuals or those with existing heart conditions. Research on TMAO remains mixed. Some studies connect red meat to higher TMAO, while others find no such link. However, this trial indicates that lean, unprocessed beef—when paired with vegetables, whole grains, and healthy fats—does not appear to carry the same risks as previously believed.

The findings suggest that including lean beef in a Mediterranean diet may benefit heart health. Blood pressure and TMAO levels improved compared to a Western eating pattern. Further research is needed to confirm whether these effects apply to broader groups, including older adults or those with cardiovascular disease.