She says she wasn't hungry at that limit because of her lack of mobility.

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While food is generally thought to be beneficial, the authors maintain that, if eaten to excess, food can actually be harmful, causing such health-robbing problems as acid reflux, obesity, diabetic syndrome, lack of mobility and, in extreme cases, cancer, cardio-vascular disease or even death.

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This overall lack of upward mobility, argues Mr Philippon, contributes largely to ordinary French cadres' dissatisfaction with corporate life.

ECONOMIST: Schumpeter