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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.
The use of protein for energy is not necessarily economical for the body, because tissue maintenance, growth, and repair are compromised to meet energy needs. If taken in excess, protein can be converted into body fat. Protein yields as much usable energy as carbohydrates, which is 4 kcal/gm (kilocalories per gram).