Once your body has adapted to the restricted food intake (the diet) by releasing glycogen and shedding water, it then will tend to lose lean tissue. And, the body of an overweight person will attempt to preserve fat just because that is what it is accustomed to doing.
The less food you eat, the less energy you need to digest it. A diet that cuts 500 calories per day needs approximately 50 calories per day less for digestion.
The liver and associated areas use 27% of body energy, the brain uses 20%, skeletal muscles use 18%, kidneys 10%, the heart uses 7%, and the remainder of the vital organs use 18% of body energy. 65% of the energy is used by the vital organs whose combined weight totals only about 5% of the body's weight. Most of the remaining energy is used by the muscles, which are more active than body fat.
A sedentary person's body uses most of its energy from food for vital function. An estimate of energy needs of a sedentary person are: 65% for autonomous functions, 10% for digestion, and 25% for all other activities.
Copyright 2011 Lynn Borenius Brown
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