请教牛牛们一道逻辑题！PREP 2-42

Researchers have found that when very overweight people, who tend to have very low metabolic rates, lose weight primarily through dieting, their metabolism generally remain unchanged. They will thus burn significantly fewer calories than do people whose weight is normally at that level. Such newly thin persons will, therefore, ultimately regain weight until their body size again matches their metabolic rates.

The conclusion of the argument above depends on which of the following assumptions?

(A)     Relatively few very overweight people who have dieted down to a new weight tend to continue to consume substantially fewer calories than do people whose normal weight is at that level.

(B)      The metabolisms of people who are usually not overweight are much more able to vary than the metabolism of people who have been very overweight.

(C)     The amount of calories that a person usually burns in a day is determined more by the amount that is consumed that day than the current weight of the individual.

(D)     Researchers have not yet determined whether the metabolic rates of formerly very overweight individuals can be accelerated by means of chemical agents.

(E)      Because of the constancy of their metabolic rates, people who are at their usual weight normally have as much difficulty gaining weight as they do losing it.

答案是A。
            通过排除，我选择A，但是A我迷惑的是Consume 在句中指的是burn（消耗）呢还是eat。我按照是消耗理解的，但是感觉不对。要是按照eat理解，似乎是符合逻辑的。

C选项中calories that burns is determined by the amount that is consumed,  在这里consume肯定不是消耗的意思。

不知道我的理解对不对，请牛牛们多多指教，灰常灰常感谢啦！