Every day we lose water through breathing, perspiring, and excretion. Understandably, it must be replenished for our body to function properly. So how much does the average person need? Most doctors recommend 8-9 cups. Here are 3 common ways to also estimate it:
Eight 8-ounce glasses. Another approach is the 8 x 8 rule. It is not necessarily supported by scientific evidence but it serves as an easy guideline to remember how much to drink.
Dietary recommendations. The Institute of Medicine advises men consume 13 cups of total beverages and women consume 9 cups of total beverages a day.
The most important thing is to remember to drink enough fluid so that you rarely feel thirsty and produce enough urine that is colorless or slightly yellow. You may also need to increase your total fluid intake when you exercise, live in hot climates, during illness (especially fever, vomiting, or diarrhea), and during pregnancy/breastfeeding.