P336 大全上的一道题。

lisiberry

Researchers have found that when very overweight people, who tend to have relatively low metabolic rates, lose weight primarily through dieting, their metabolisms generally remain unchanged. They will thus burn significantly fewer calories at the new weight 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 rate.

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 metabolisms 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 by 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.

OA；A
这道题的答案没啥问题。
大家觉不觉得，这个变瘦又变胖的人，按照逻辑应该就会一直变胖，然后永远停不下来？

RRZZR

按题目说法加上A的assumption，这些人如果不改变他们的metabolic rates，体重会趋向一个恒定的值。dieting只能临时的造成体重的降低，但一断dieting体重慢慢的又回去了。

作者的意思大概是要想减肥，就得改变metabolic rates（通过锻炼啊什么的）

lisiberry

RRZZR 发表于 2017-3-15 23:41
按题目说法加上A的assumption，这些人如果不改变他们的metabolic rates，体重会趋向一个恒定的值。dieting ...

谢谢RRZZR，就按照你讲的这样去理解了。

lisiberry

另一个领悟

其实我觉得，你看消耗量恒定，摄取量恒定，人还会复胖。这就是说明减肥成功到复胖的过程中摄取量永远大于消耗量，这样才能产生脂肪堆积。
人复胖以后就不会长得更胖，就说明消耗量=摄取量。人的摄取量不变，那就是说明人变胖后热量的消耗量增大。
哦，可以理解为胖子动一下很费力，消耗热量更大。

好了，也算是弄明白了。