To add more complexity, all of the components of total daily energy expenditure can differ depending upon a number of factors. Total daily energy expenditure is the sum of basal metabolic rate (the number of calories necessary to keep you alive while maintaining body weight), exercise activity thermogenesis (your workouts in the gym), thermic effect of food (roughly 10 percent of energy consumed is used to digest/absorb food) and non-exercise activity thermogenesis (NEAT). However, assuming all calorie containing food and beverages are accurately accounted for, energy intake can be measured relatively accurately.Įnergy expenditure is more difficult to quantify. Under-reporting of calorie intake has been widely reported in the scientific literature even in trained dietitians. However, it should be noted that people tend to under-report intake. However, there are a number of factors that go into this seemingly simple equation.Įnergy intake is relatively easy to measure since it is the sum of all energy containing foods and beverages consumed. If you consume more calories than you expend you will gain weight and if you expend more calories than you intake you will lose weight. Energy Balance = Calories In – Calories Out
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