Moreover, following the low-fat/high-carb diet of the U.S.D.A.Food Pyramid may not only make it difficult to control weight, it could actually be dangerous, according to Willett.

• Willett还认为，根据美国农业部食物金字塔而制定的低脂肪高碳水化合物饮食方法也许不仅难以控制体重，其实可能还会造成危险。