Yes—drinking water on an empty stomach can be beneficial, but many of the claims you may see online are exaggerated.
What the evidence supports:
- Rehydrates your body after several hours without fluids during sleep.
- May help you feel more alert if you were mildly dehydrated.
- Supports normal digestion and overall body functions.
- Can help some people eat less if they drink water before breakfast, though the effect on long-term weight loss is modest.
Claims that are not well supported by scientific evidence include that drinking water on an empty stomach:
- “Flushes toxins” (your kidneys and liver already do this continuously).
- Dramatically boosts metabolism.
- Cures digestive disorders.
- Improves skin on its own.
- Prevents or treats chronic diseases.
For most healthy adults, drinking a glass of water when you wake up is a simple way to stay hydrated. There’s no evidence that it’s significantly better than drinking water at other times of the day—the important thing is getting enough fluids throughout the day.
If you were referring to a specific claim you’ve seen (for example, that it lowers blood pressure, aids weight loss, or “cleanses” the body), let me know what it says, and I can explain what the evidence shows.
