04/05/2025
Do You Really Need 8 Glasses of Water a Day?
You’ve probably heard the rule: drink eight 8-ounce glasses of water daily. But here’s the truth — there’s no scientific basis for this exact number.
Our water needs depend on a variety of factors, including age, body size, activity level, diet, and environment. The “8x8 rule” likely originated as a general guideline, but it oversimplifies how hydration actually works.
Here’s what science says:
The Institute of Medicine recommends about 2.7 liters (91 oz) for women and 3.7 liters (125 oz) for men per day — but this includes all fluids, not just water.
That means coffee, tea, fruits, soups, and even vegetables contribute to your hydration.
Your body is smart — thirst is a reliable indicator. If you’re healthy, your body will prompt you to drink when needed.
Urine color is also a great gauge. Pale yellow? You’re likely well-hydrated.
So, while staying hydrated is essential, obsessively counting glasses isn’t necessary for most people. Listen to your body, and drink accordingly — especially during exercise, hot weather, or illness.
Bottom line: There’s no need to stress about “8 glasses.” Hydration should be intuitive, not rigid.