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[A] The following conclusions are supported by good evidence:
The majority of better designed and controlled experimental trials consistently did not find caffeine doses of ≤225 mg (equivalent to 1-2 cups of coffee or 5-6 cups of black tea or 4-5 cans of cola) to cause diuresis. Occasionally, higher doses of caffeine (240-640 mg) promoted diuresis in some individuals. However, even when diuresis was observed in trials it consistently did not lead to a negative fluid balance or