Lets solve this step by step,
Premise 1: People on the new high-protein diet lose more weight than those on traditional diets.
Premise 2: Older adults generally struggle more with weight loss.
Observation: Older adults on the new diet lose weight at nearly the same rate as younger adults, despite the general trend of older adults losing weight more slowly.
(A) Older adults generally have slower metabolisms and hence find it more difficult to lose weight regardless of diet plan.
This just restates the general trend (older adults struggle with weight loss) but does not resolve why older adults lose weight just as effectively as younger adults on the new high-protein diet.
This doesent resolve the paradox
(B) Younger adults tend to be more physically active, which can enhance the effectiveness of any diet plan.
This too just provides information about younger adults' activity levels but does not explain why the high-protein diet equalizes weight loss rates for older and younger adults
This doesent resolve the paradox
(C) Individuals who feel they have struggled significantly with weight for many years are more likely to adhere strictly to new diet recommendations.Older adults may have struggled with weight loss longer than younger adults, leading them to adhere more strictly to the new diet.
If older adults follow the diet more rigorously, this could explain why they achieve weight loss results similar to younger adults despite their slower metabolisms.
This resolves the paradox
(D) The new high-protein diet plan was primarily marketed towards individuals who have not previously tried structured dieting.
This gives a general background about the diet’s marketing but does not explain the similar weight loss rates between older and younger adults
This doesent resolve the paradox
(E) Most diet plans do not consider age-related metabolic changes when calculating recommended food intakes.
It might be true for other diets, but it does not explain why the new high-protein diet helps older and younger adults lose weight at similar rates
This doesent resolve the paradox