From 1991 to 1993, crop shortages left eight Biosphere 2 residents eating 1,750–2,100 calories a day; body weight fell 17% as insulin and cholesterol also dropped

Eight individuals lived in Biosphere 2 for two years, facing food shortages. Their diet provided fewer calories, leading to weight loss and reduced insulin. Researchers observed significant physiological changes in the crew members during confinement. Despite these changes, the crew maintained good health and high activity levels. The mission provided insights into sustained calorie restriction in humans.
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