How does age affect nutritional needs?

Age significantly influences nutritional needs due to various physiological changes that occur over a person's lifespan. As individuals age, their metabolism tends to slow down, which can affect the amount of energy (calories) they require. Additionally, activity levels often decrease with age, which further alters energy needs and can lead to changes in the types and amounts of nutrients required for optimal health.

For example, younger individuals tend to have higher energy and protein needs, as they are often in phases of growth or increased physical activity. In contrast, older adults may need fewer calories but still require sufficient amounts of essential nutrients, such as proteins, vitamins, and minerals, to maintain muscle mass, bone health, and overall metabolic functions.

Therefore, the correct answer highlights that age influences nutritional requirements because of these metabolic and activity level changes, which necessitate adjustments in dietary intake to promote health and well-being across different life stages.