Resting Metabolic Rate (RMR) is the energy your body uses at rest for essential functions like breathing and circulation. Non-Exercise Activity Thermogenesis (NEAT) accounts for calories burned during daily activities like walking or fidgeting. Exercise Activity Thermogenesis (EAT) reflects energy spent on purposeful physical exercise. The Thermic Effect of Food (TEF) is the energy required for digestion and nutrient absorption. Total Daily Energy Expenditure (TDEE) combines RMR, NEAT, EAT, and TEF, providing insight into your total calorie needs for effective weight management and tailored fitness plans.