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Proteinâenergy wasting (PEW) is the state of decreased body stores of protein and energy fuels (that is, body protein and fat masses). This abnormality is often associated with diminished functional capacity related to metabolic stresses.
If the body is a machine, then food is the fuel. Being more specific, carbohydrates, fat and protein in foods provide energy for body functions and physical activities (see table 1). They, however, do not produce the same amount of energy (see table 2). Fat produces more than two times energy per gram than either carbohydrates or protein. Metabolism in the body converts carbohydrates, protein and fat into energy. Any excess of these nutrients will be stored as fat in the body.