Caffeine is known to be what kind of substance that can lead to dehydration?

Caffeine is classified as a diuretic, which means it can increase urine production and subsequently lead to a loss of fluids. When caffeine is consumed, it stimulates the kidneys to filter and excrete more sodium and water. This diuretic effect can contribute to dehydration if fluid loss isn't compensated with adequate water intake.

While caffeine also acts as a stimulant, promoting alertness and reducing fatigue, its primary role in this context is its diuretic properties. The classification as a diuretic distinguishes it from analgesics, which are pain relievers, and minerals, which are inorganic elements essential for various bodily functions. Therefore, recognizing caffeine as a diuretic is crucial for understanding its effects on hydration status.