A physics model for weight loss by dieting

A person’s average weight is determined by the equilibrium between his caloric intake (from food and liquids) and his energy loss (primarily by radiation and water evaporation). By dieting, one’s weight can decrease significantly over a period as short as a couple dozen weeks. A simple physics-based model is developed that describes such a change in weight with time. The predictions are in reasonable accord with televised results of disciplined dieting plans