Passage Summary: A study found that pilots who decided to diet suddenly flew much worse than they used to, while those who didn't diet kept performing well.

Reasoning: The study observed that pilots who chose to diet performed significantly worse than non-dieters, showing impairment levels comparable to mild alcohol consumption.

Analysis: This is a Paradox 'Except' question. We are looking for the one answer that *does not* help explain why dieting pilots performed poorly. Four of the answers will likely provide physiological or psychological reasons for the decline—such as low blood sugar, the mental distraction of hunger, or irritability. The correct answer will be the one that is irrelevant to the performance drop or perhaps even suggests that dieters should have performed better, leaving the mystery unsolved.