Have you ever wondered why your body goes to such extremes to store fat you don't want? One reason is that your body fat protects against mechanical injury. Another reason is that it acts as a heat insulator. Fat added during pregnancy us and energy reserve for the nursing mother, a reserve that may be depleted only with extended breastfeeding.
Even more important than these reasons is simple survival. Our ancestors' bodies were adept at storing fat in anticipation of constant famines. For them, it was survival of the fattest. Although this is still true for some people in some areas of the world, for most of us famine means "I didn't have time to eat today." When you reach the bottom line, your excess fat is more likely to be a health liability than survival insurance.
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