Loss of strength after age 45 is attributed to

A) severe health problems in middle age.
B) loss of muscle fiber.
C) loss of fat.
D) injuries for which the body is unable to compensate.

Loss of Muscle Fiber

The reduction or wasting away of muscle tissue, often due to aging, inactivity, or diseases affecting the muscles.

Health Problems

Issues or conditions that negatively impact an individual's physical or mental well-being.

Loss of Fat

The reduction in the body's fat stores, which can result from diet, exercise, or metabolic conditions.