IMO Co resolve the apparent paradox in the nutritionist's statement, we need to find an explanation that aligns with the observation that both young and older adults have nearly identical weight loss success rates on the new high-protein diet, despite older adults generally struggling more with weight loss. Let's analyze each option:
(A) Older adults generally have slower metabolisms and hence find it more difficult to lose weight regardless of diet plan.
This option restates the known challenge that older adults face with weight loss due to slower metabolisms. However, it does not explain why older adults on the new diet have similar success rates to younger adults. It highlights the difficulty but does not resolve the paradox.
(B) Younger adults tend to be more physically active, which can enhance the effectiveness of any diet plan.
This option suggests that younger adults' physical activity could enhance diet effectiveness. While this is true, it does not explain why older adults on the new diet are achieving similar success rates as younger adults. It introduces a variable but does not 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.
This option suggests that older adults, who may have struggled with weight loss for a long time, are more motivated and adhere more strictly to the new diet plan. This strict adherence could lead to higher success rates, potentially explaining why older adults on the new diet have similar success rates to younger adults. This option directly addresses the paradox by suggesting a behavioral factor that could equalize the success rates.
(D) The new high-protein diet plan was primarily marketed towards individuals who have not previously tried structured dieting.
This option indicates the target audience for the diet plan but does not explain the similar success rates between young and older adults. It provides marketing information but does not resolve the paradox.
(E) Most diet plans do not consider age-related metabolic changes when calculating recommended food intakes.
This option highlights a general issue with diet plans but does not explain why the new high-protein diet results in similar success rates for different age groups. It points out a flaw in other diet plans but does not directly address the paradox.
Conclusion:
The option that most helps to resolve the apparent paradox is:
(C) Individuals who feel they have struggled significantly with weight for many years are more likely to adhere strictly to new diet recommendations.
This option suggests that older adults, who may have faced long-term weight loss challenges, are more motivated and adhere more strictly to the new diet plan, leading to similar success rates as younger adults. This strict adherence could be the key factor that balances the weight loss success rates between the two age groups, resolving the paradox.