Total Energy Expenditure (TEE): The amount of energy you burn in a 24-hour period- including your RMR, movement, and exercise.
Energy Metabolism: A rapid increase in calorie intake can cause an increase in body fat. If a reduction in food intake occurs too fast, like many diets require, your body will store more calories versus using them for energy. People reduce their daily calorie intake unintentionally or intentionally with the desire to lose weight, lifestyle changes, or as they age. Commonly, people reduce their calorie intake too fast to reduce weight, but when they lose discipline, desire, or drive, they go back to their old patterns of overeating or binge eat. When they decrease their food intake too quickly during their diet, their RMR decreases. They need less energy each day to fuel their activities. When they return to their old eating habits, they may quickly gain extra pounds on the scale. Other side effects of eating too little, or a rapid reduction in calories include: becoming fatigued, losing sleep or poor sleep, poor brain function, poor exercise performance, and possibly suffer from nutritional deficiencies.