In a recent 𝕏 post, Dr. Peter Diamandis—futurist, physician, and author often teamed up with Steven Kotler—suggested that we should be drinking 3.5 liters of water every day. His tone was clear: hydration isn’t just good advice, it’s a daily imperative.
The Official Guidelines
According to the U.S. National Academies of Sciences, men should aim for 3.7 liters of total water intake per day. Women should aim for 2.7 liters per day.
But here’s the kicker: this includes all sources of fluids—not just water. That means coffee, tea, fruits, vegetables, and even soup contribute to your hydration.
What Happens If You Drink 3.5 Liters of Just Water?
Drinking 3.5 liters of plain water every day might be perfectly safe—or it might be too much, depending on your personal needs. If you’re a healthy adult with functioning kidneys, active lifestyle, and live in a warm climate, this level of hydration could keep you energized and clear-headed.
However, overdoing it can cause issues:
Frequent urination (which can become disruptive especially when traveling) Loss of electrolytes (especially sodium, leading to dizziness or cramps) In rare cases: water intoxication (from drinking too much too fast)
When It Makes Sense to Drink More
You might benefit from 3.5 liters per day if:
You’re physically active You’re in a hot or humid climate You’re eating a high-protein or salty diet You’re traveling (hello, jet lag + dry airplane air!)
Pro Tip for Travelers:
If you’re drinking lots of water on a flight, choose an aisle seat. Hydration is great—until you’re stuck in a window seat and your bladder is staging a revolt.
Final Takeaway
Peter Diamandis is all about optimizing performance, and for some, 3.5 liters of water is a smart goal. But the best advice? Listen to your body. If your urine is pale yellow, your energy is good, and you’re not constantly running to the restroom—you’re likely hitting your hydration sweet spot.
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