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Older adults may need fewer calories while still needing nutrient-rich foods, making adequate nutrition within a smaller intake more challenging.

Thirst responds to changes in body-fluid balance, but signals from drinking can reduce the urge before water fully corrects the imbalance.

BMI screens weight relative to height, but cannot distinguish muscle from fat or show where body fat sits when assessing individual health.

Health-related fitness describes several distinct qualities, so strength in one area does not necessarily mean equal ability across the others.