Passage Summary: Science says the Beta Diet is better for you, yet people who have been on it for decades are usually in worse health than those eating normal food.

Reasoning: Medical research indicates the Beta Diet is objectively healthier than conventional diets, yet long-term followers of the Beta Diet are statistically more likely to be in poor health.

Analysis: We are faced with a classic discrepancy between the theoretical benefits of a diet and the actual health outcomes of its practitioners. To resolve this paradox, we need to find a factor that explains why the 'healthier' group looks worse on paper. Perhaps the diet attracts people who are already ill, or maybe the health benefits only apply if the diet is started before certain conditions develop. Look for an answer that provides an external reason for this correlation without denying that the diet itself is healthy.