Which non-specified factor is listed as a contributor to increasing water requirements besides heat?

• A. More dietary salt
• B. Decreased appetite
• C. Sleep duration
• D. Increased exercise only

Answer: (A)

A higher salt intake increases water requirements because salt raises the body's solute load. When you consume more sodium, the kidneys work to excrete the extra sodium in urine, and water follows to maintain balance. This osmotic load means you need more water even if the ambient temperature isn’t high. The other options don’t fit as a clear, non-specified driver: decreased appetite doesn’t inherently raise water needs, sleep duration isn’t a direct determinant of hydration requirements, and while increased exercise can raise water loss, the question’s emphasis is on a non-heat factor, with dietary salt being the primary example.