What age-related changes contribute to dehydration risk?

What age-related changes contribute to dehydration risk?

• A. Decreased total body water and lower thirst drive
• B. Increased muscle mass
• C. Higher bone density
• D. Improved renal concentrating ability

Answer: (A)

Dehydration risk in older adults mainly comes from two age-related changes: less total body water and a weaker thirst drive. As people age, lean body mass decreases and fat increases, causing overall body water to drop. With less fluid reserve, even small losses can lead to dehydration. At the same time, the sensation of thirst becomes less responsive, so older adults may not drink enough to compensate for fluid losses, especially during illness, fever, heat, or after diuretic use. Muscle mass tends to decline with aging, not increase. Bone density often decreases rather than increases. Renal concentrating ability typically declines with age, which can worsen dehydration risk, not improve it.

Dehydration risk in older adults mainly comes from two age-related changes: less total body water and a weaker thirst drive. As people age, lean body mass decreases and fat increases, causing overall body water to drop. With less fluid reserve, even small losses can lead to dehydration. At the same time, the sensation of thirst becomes less responsive, so older adults may not drink enough to compensate for fluid losses, especially during illness, fever, heat, or after diuretic use.

Muscle mass tends to decline with aging, not increase. Bone density often decreases rather than increases. Renal concentrating ability typically declines with age, which can worsen dehydration risk, not improve it.