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Why do we have to exercise to truly lose weight? Body weight is a function of energy in eaten and energy expended base metabolism plus exercise. Base metabolism rate can only be changed by factors like a fever, staying awake versus sleeping more, and how much energy the body needs to sustain itself. We must exercise to lose weight because it burns calories above the basal rate, as well as raises the basal rate due to the increased proportion of muscle. http://www.videofitness.org