When we eat more energy (calories) than we use, much of it will be stored and we will gain weight. Remember, our ability to store carbohydrate (as glycogen) is limited to about 300 to 500 grams and body protein content is based upon the protein needs of our body, not how much protein we eat. This means that the more carbohydrate and protein we eat, the more we will use for energy during the hours that follow and throughout the day. This will decrease our use of fat as a fuel source. In addition, some of the energy in the carbohydrate and protein we eat will be used to make fat. So when we eat too many calories, less body and food fat is used for energy and a little fat is made as well. Subsequently, more and more body fat will accumulate over time.
More than 80 percent of the weight gain from overeating is fat; the rest is supportive materials such as bone, muscle, and connective tissue.
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