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Set point theory, as it pertains to human body weight, states that there is a biological control method in humans that actively regulates weight towards a predetermined set weight for each individual. This may occur through regulation of energy intake (e.g. via increased or decreased appetite) or energy expenditure (e.g. via reduced metabolism or feelings of lethargy). Set point theory explains why it is difficult for dieters to maintain weight loss over time, as calorie restriction may become

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