Energy balance is the relationship between your energy intake and your energy expenditure, which are both measured in calories. Your basal metabolism, the thermic effect of food, and your physical activities all determine your daily energy needs.
Energy imbalance occurs when you consume either fewer or more calories than you need daily and can result in weight loss or weight gain. Over time, a chronic energy imbalance results in a change in body weight, either weight loss or weight gain.
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