mykrasovski wrote:
nightblade354 GMATNinja why is (D) incorrect? Let's say researchers find the chemicals to accelerate the metabolic rate of formerly overweight people. If so, then the overweight people, after loosing weight, will take medication or whatever chemicals to accelerate their metabolic rate. In that case, they will continue burning calories at a high rate and, thus, they will not re-gain weight. So, the argument is broken.
Researchers have found that when very overweight people, who tend to have relatively low metabolic rates, lose weight primarily through dieting, their metabolism 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?
(D) Researchers have
not yet determined whether the metabolic rates of formerly very overweight individuals can be accelerated by means of chemical agents.
So who cares about the fact that they have determined this? We have to make so many assumptions to justify your comments above. Do not make the answer work for you by filling in information (like taking a medication). Our conclusion is that because metabolism is unchanged, people will regain weight. If we take (D), maybe it speeds it up by .00000001% and doesn't do anything; maybe the patients haven't heard of this medicine, or can't afford it, or can't take it, ect. I think your reasoning about giving an alternate reason as to why the weight will be kept off is fine, but this answer isn't it.