It’s supposed to be good for you. The effects of the Mediterranean diet were tracked over five years in a study published in 2013, but its results have now been called into question.

The original research found that the diet – featuring fresh fruits and vegetables, seafood, nuts, olive oil and red wine, but very little red meat or sugar – reduced the risk of cardiovascular disease, contributed to slight reductions in rates of heart attack and death, and more significantly lowered the risk of stroke.

Since …