Beverages & Hydration
topic
All beverages contribute to total fluid intake — with water, herbal teas, diluted juices, and broth having net positive hydration contributions, caffeinated beverages (coffee, tea, caffeinated soft drinks) having a mild diuretic effect that is substantially offset by their water content at moderate consumption (net positive hydration at ≤400mg caffeine/day), and alcoholic beverages having a significant diuretic effect through ADH (antidiuretic hormone) suppression that produces net fluid loss proportional to alcohol content.
Role
Beverage hydration literacy is practically important because most people's fluid intake comes from beverages other than plain water — and the net hydration contribution of those beverages varies significantly by type. The person who drinks 3 cups of coffee, 2 glasses of wine, and 1 glass of water daily may believe they are adequately hydrated while being in net negative fluid balance from the diuretic effects of alcohol offsetting the positive contributions of everything else. Understanding the hydration arithmetic of a daily beverage pattern is a basic practical skill that most people have never applied to their own consumption.