Human being’s backbone consists of 26 vertebrae which are held together by ligaments and by a cushion-like substance known as inner vertebral discs. Ligaments join one bone to the other. But the function of cushion-like inter vertebral disc is to prevent two bones from colliding with a person walks, runs, lifts weights or jumps. Due to the very nature of their function, inner vertebral discs can not avoid being compressed. This results in a person losing some height during the day. When he lies down for the night’s rest, the pressure on the discs eases. Each disc, made of a gel like semi-liquid substance regains its original size, resulting in slight increase in height.
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