题目选项分析

Many diets, because they deprive the body of carbohydrates, can likely lead to ketosis—muscle loss occurs accounting for much of the observed weight loss—though they may aid in the loss of weight.

Depriving the body of carbohydrates, a strategy common in fad diets, may aid in weight loss, but such a regimen can likely lead to ketosis, which can cause muscle loss—a result that can often account for much of the observed weight loss.