Moderate caffeine intake of as little as 240 mg/day, or approximately 2 cups of coffee, can lead to dehydration due to its diuretic effects but may also provide a performance benefit.

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Despite the widely held belief that caffeine intake can lead to dehydration due to its diuretic effects, moderate caffeine intake (less than 240 mg/day, equivalent to a little more than 2 cups of coffee) has very little impact on urine losses, is unlikely to cause dehydration, and may provide a performance benefit.

Moderate Caffeine Intake of as Little as 240 Mg/day, or Approximately