Why do nutritional needs change through the life cycle?

Nutritional needs change throughout the life cycle due to varying physiological demands at different stages, such as growth, development, and aging. For instance, infants require higher amounts of certain nutrients for rapid growth, while adolescents need increased calories and protein for puberty. As individuals age, their metabolism slows, and nutrient absorption may decline, necessitating adjustments in dietary intake to maintain health. Additionally, lifestyle changes, health conditions, and hormonal shifts can further influence nutritional requirements at various life stages.