One well-known reason for this is that dietary fat converts to body fat more effciently than does protein or carbohydrate, but recently scientists have uncovered what appears to be an equally important factor.

• 一个广为人知的原因是，食物中的脂肪比蛋白质或碳水化合物更易转化为身体中的脂肪。 不过最近科学家发现一个看来同等重要的因素。