weakening is so difficult/ 55 3/22

lily88888UID: 2828533

In a study, one group of volunteers was fed a high-protein, low-carbohydrate diet; another group was fed a low protein, high -carbohydrate diet. Both diets contained same number of calories, and each volunteer's diet prior to the experiment had contained moderate levels of protein and carbohydrates. After ten days, those on the low-carbohydrate had lost more weight than those on the high-carbohydrate diet. Thus, the most effective way to lose body fat is to eat much protein and shun carbohydrates.

Which one of the following, if true, most weakens the argument above?

A. A low-protein, high-carbohydrate diet causes the human body to retain water, the added weight of which largely compensates for the weight of any body fat lost, whereas a high-protein, low-carbohydrate diet does not.

C. High-protein, low-carbohydrate diet will often enable the human body to convert some body fat into muscle, without causing any significant overall weight loss.

duijinxiaoziUID: 2585955

A low-protein, high-carbohydrate diet
相对而言，减少的重量少。
但是，是因为增加了些水的重量，才显得减少的少。
A