Healthy dietary patterns linked to longer lifespan

Multiple epidemiological studies find that strong adherence to several healthy eating patterns—such as the Mediterranean diet, plant‑forward regimens rich in fruits, vegetables, legumes, whole grains, nuts and seeds, and low in ultra‑processed foods, trans fats and sugary drinks—is associated with increased longevity and lower risk of chronic diseases. A 2020 investigation by researchers at the Harvard T.H. Chan School of Public Health showed reduced heart disease risk across four dietary scores, while a 20‑year study of 642 adults aged 65 and older linked higher Mediterranean‑diet scores to lower all‑cause and cardiovascular mortality.

The evidence also suggests benefits for type 2 diabetes, cognitive decline and overall mortality. Key components include moderate alcohol consumption and limited red and processed meat. Researchers note that no single diet is universally superior, but multiple patterns can confer similar health advantages.