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The Truth About Drinking 8 Glasses of Water Daily.
The idea might come from the fact that we need about 1 ml of water per calorie we eat. If you eat 2,000 calories, that’s about 2 liters (or 8 glasses). But research shows that this one-size-fits-all approach doesn’t work for everyone. Some people need more, some need less.

References:
https://www.healthline.com/nutrition/8-glasses-of-water-per-day

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