Which of the following is an expected physiological change due to usual aging?

The declining lean body mass is an expected physiological change associated with the aging process. As individuals age, there is a natural shift in body composition, which often includes a loss of muscle mass and an increase in body fat. This phenomenon, known as sarcopenia, reflects not only changes in muscle fibers but also alterations in metabolic activity and hormonal regulation.

This decline in lean body mass can affect strength, mobility, and overall physical function, leading to a higher risk of falls and decreased quality of life. Understanding this change is crucial in developing appropriate exercise and nutrition programs that aim to mitigate the loss of muscle mass and promote overall health in older adults.