Bamboo is an essential part of the diet of many wild creatures, notably the giant panda, which eats nothing else.
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Campbell said he grew up on a dairy farm and for a long time held to the belief that animal protein was an essential part of a healthy diet.
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Calcium and vitamin D, by contrast, are essential to maintaining the bones and can be had by adjusting your diet.
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These bees prefer sweaty people over most animals because the human diet usually is so salty that their perspiration is saturated with the essential nutrient, experts said.
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