阅读下列短文, 从给的四个选项 (A、B、C和D) 中, 选出最佳选项。
(2013·海口市调研，D)
Any diet on which you eat fewer calories than you need to get through the day, like an 800calorieperday diet, can be dangerous. Diets that don't allow any fat also can be bad for you. Everyone needs a certain amount of fat in their diet, up to 30% of total calories, so no one should eat a completely fatfree diet.
