What factors can affect daily energy expenditure?

Daily energy expenditure can be influenced by several factors, including basal metabolic rate (BMR), physical activity level, and thermic effect of food. BMR varies based on age, sex, weight, and body composition, while physical activity encompasses both structured exercise and daily movement. Additionally, the thermic effect of food refers to the energy required for digestion, absorption, and metabolism of nutrients. Other factors such as hormonal changes, stress levels, and environmental conditions can also play a role.