Excess weight increases the weight on the disc and small joints in the lower back. Increased weight increases compression, degeneration, and pain. Also, excess weight is not gained symmetrically. The rule most weight gain is at the abdomen.  This creates a lever arm that multiplies the actual load (weight) on the discs and small joints of the lower back. The lower back muscle must then contract to maintain upright posture, further adding to the weight to the spine.

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