It’s lean fare for rich eaters. A study of 18,000 subjects on a Mediterranean diet — less red meat and more fish, olive oil, fruits, veggies and nuts — found that cardiovascular benefits correlate to incomes. In other words, the richer you were, the better the diet was for your health. The findings suggest that it’s not simply what is consumed, but the quality of ingredients that determines how your body benefits. With pricier varieties often nutritionally better, doctors recommending the diet should consider patients’ budgets, and suggest cheaper alternatives, like red leaf lettuce over kale.