First, carbohydrates stimulate the appetite and encourage the overconsumption of calories; that is calories from carbohydrate act differently on the appestat than do calories from fat and protein. Second, calories from carbohydrate cause increasing secretion of the fat-building hormone, insulin, that specifically stores as fat any excess calories ingested as carbohydrate. In addition, calories from fat require an input of (wasted) energy before they can be stored or metabolized within the body whereas carbohydrates do not. As a result calories from carbohydrate are not the same as calories
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