Because carbohydrates tend to raise blood-sugar levels, many tend to think that a low-carb diet should help prevent diabetes.

But Harvard Researchers analyzed 20 years of data on 41,410 men and found that low-carb intake actually increases the risk of type-2 diabetes by 12%. Red and processed meats seemed to be the biggest culprit, because vegetable protein did not change the risk level.

PositiveTip: A dietary pattern low in animal products and high in fruits, vegetables, whole grains and some nuts is a healthy way of preventing disease.