Some animals live in environments in which the food supply fluctuates. When it is scarce these animals do not breed, but invest resources into survival until food is again available, and they can reproduce. Under these circumstances the lifespan can be increased, just as it is after calorie restriction. Other animals have a fairly constant food supply, and it is predicted that these would not have an extended life span if subjected to calorie restriction. Hibernation is a natural form of calorie restriction, and in some cases may lengthen lifespan.

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