Energy homeostasis, or the state of balance, achieved by matching energy intake with energy expenditure, is partially dependent on the regulation of meal size consumed. In order for meal size to have an effect on energy metabolism, it must affect either or both components involved in the regulation of energy balance, namely energy intake and energy expenditure. Energy balance is the difference between energy ingested and energy expended over a given period of time. Consequently, energy storage is equal to intake minus expenditure. The following sections examine the effect of meal size on the two components of the energy balance equation.
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