Locusts fed a high-carbohydrate, low-protein diet kept eating until they consumed enough protein, according to research by Stephen Simpson of Sydney University’s Charles Perkins Centre. When the diet balance was reversed, however, the locusts stopped eating carbohydrates before reaching the optimal amount, leading them to lose weight in much the same way humans respond to high-protein diets, Simpson said. "We found that same pattern in a whole range of other animals. The other omnivore we found it in was us."
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