Mediterranean diet works better for wealthy people, study finds
The Mediterranean diet -- rich in fruits, vegetables, fish, olive oil, nuts and whole grains -- has long been hailed as a heart-healthy eating plan. But new research suggests its health benefits may be limited to the rich and well-educated.
For the study, a team of Italian scientists reviewed diets, income and education level of nearly 19,000 men and women.
The investigators found the Mediterranean diet was associated with about a 60 percent lower risk of heart disease and stroke among those with higher incomes and more education. The same was not true for those with fewer resources -- even though they followed a similar eating plan.
Healthy habits -- such as getting regular exercise, routine check-ups, and not smoking -- are more common among people with higher incomes. But the study findings held up even after the researchers accounted for these variables and others, such as marital status and body mass index (a measurement based on height and weight).
The team investigated other possible explanations for this healthy diet disparity. The findings showed that the wealthier participants ate less meat and consumed more fish and whole grains than those with lower incomes.
The more affluent people also ate a greater variety of fruits and vegetables, which provided more antioxidants and other essential nutrients. The researchers concluded that food quality may be as important for health as how much people eat and how often.
"Money may provide access to a larger variety of foods typical of the Mediterranean diet, such as fruits and vegetables, thus obtaining more adequate intake of essential nutrients," said the study's leader, Giovanni de Gaetano. He's head of the department of epidemiology and prevention at the I.R.C.C.S. Neuromed Institute in Pozzilli, Italy.