We acquire energy through the food we eat and sleep........ but both should not be taken in excess......

Excess calories are stored in the body as fat cells. If too many of these acquire, a person gains weight as the fat builds up. Excess fat can cause health and body damage, so it is important to limit these excess calories by exercising and burning off some of them.

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Trees do not have excess leaves in Summer,they have the number required to carry out their function.