It’s a popular belief that caffeine, which is found in coffee, is a diuretic. A diuretic is a substance that increases the flow of urine to rid the body of excess water. Diuretics also increase the elimination of waste in the body by removing them when you urinate. Caffeine is thought to have an unfavorable influence on your body’s fluid balance, meaning that it affects your kidneys, producing excess urine. Your kidneys produce ADH (antidiuretic hormone), which helps you maintain the correct amount of fluid. When you consume diuretics, such as those found in alcohol or caffeinated beverages, your kidneys are unable to produce ADH, so your body doesn’t retain water and it is expelled through urination.
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