Also, muscle is made up of mainly water (70 percent). When a hungry body is not given enough calories, the body cannibalizes itself for an energy source. The prime directive of the body is that it must have energy, at any cost—it’s part of the survival mechanism. The protein in muscles is converted to valuable energy for the body. When a muscle cell is destroyed, water is released and eventually excreted. The whittled-away muscle contributes to lowering your metabolism. Muscles are metabolically active tissue—generally the more muscle we have, the higher our metabolic rate. That’s one of the
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