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.

I found this question in another topic, but the explanation is still unclear to me. So, I want to make new thread to open more discussion on this problem. OA later.
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I went with A. By the statements, if one loses weight and he does not continue to be on the diet then he ll gain weight. Meaning people who are already on that weight size will consume more than he does

"therefore, ultimately regain weight until their body size again matches their metabolic
rate."

I was assuming this is the conclusion. And so I chose E because it states that people will usually stay at the weight even when people try to gain weight.
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DETERMINED TO BREAK 700!!!

+1 for E, if correct then will explain.

A..A newly thin person will regain the same weight(what was before dieting) if that person takes more calories as compared to what is suitable to his new weight.

IMO C , A is incorrect as it has mentioned "very few" where in the passage it has no where mentioned. E we can not assume on the basis of above passage and not logically correct to fit enough.

A clearly

For some reasons, i find this question is hard and confusing (mostly because of the vocab). I was able to make the right choice but mostly through POE rather than logical thinking. Wonder if anyone think the same?

(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. Tell us that Formerly overweight people will consume more calories and burn less due to lower metabolic rate. As a result they will again gain weight.
(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. Argument is not concerned with this category. So B is out of Scope
(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. Out of scope
(D) Researchers have not yet determined whether the metabolic rates of formerly very overweight individuals can be accelerated by means of chemical agents. Tricky choice but it has no bearing on the argument. If this option tells that artificially metabolism rate can not be accelerated, then it would have been a possible answer choice.
(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. Out of scope. We are not concerned abt this group.

Answer: A
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Meaning of the passage : very overweight people loose weight via dieting -> metabolism rate remains same -> new weight, old metabolism -> can't burn what they eat -> Finally go to their old weight

Assumption here is, even after reducing weight, they continue to consume as much calories as they used to. Option A states this assumption, and hence is right.