Which age-related change best explains a patient who complains of weight gain despite a healthy diet?

Which age-related change best explains a patient who complains of weight gain despite a healthy diet?

• A. Body fat increases until middle age.
• B. Body weight increases after middle age.
• C. Fat is redistributed to the hips after middle age.
• D. Body fat promotes a pear-shaped appearance for aging women.

Answer: (A)

Weight gain in aging is often due to changes in body composition rather than a change in eating alone. As people get older, lean muscle mass tends to decline while fat mass increases. This shift lowers resting energy expenditure, so calories that previously supported the same weight are more likely to be stored as fat. Because fat accumulation tends to rise up to middle age, this pattern best explains why someone can gain weight even with a healthy diet. The other ideas—weight increasing mainly after middle age, fat moving primarily to the hips creating a pear shape, or fat distribution changing in a way that isn’t typical—don’t align as well with how fat mass increases and how aging affects body composition.

Weight gain in aging is often due to changes in body composition rather than a change in eating alone. As people get older, lean muscle mass tends to decline while fat mass increases. This shift lowers resting energy expenditure, so calories that previously supported the same weight are more likely to be stored as fat. Because fat accumulation tends to rise up to middle age, this pattern best explains why someone can gain weight even with a healthy diet. The other ideas—weight increasing mainly after middle age, fat moving primarily to the hips creating a pear shape, or fat distribution changing in a way that isn’t typical—don’t align as well with how fat mass increases and how aging affects body composition.