The headline “Did you know that drinking water on an empty stomach could be…” is usually followed by claims that it can cure diseases or dramatically improve health. Those claims are often overstated.
Here’s what drinking water on an empty stomach can and can’t do:
Potential benefits
- Rehydrates your body after several hours without fluids during sleep.
- Supports normal digestion by helping the digestive system function properly.
- May help you feel full, which can reduce how much you eat at breakfast for some people.
- Supports kidney function by helping maintain hydration.
- Helps maintain normal physical and mental performance, especially if you wake up mildly dehydrated.
Common myths
There is no good scientific evidence that drinking water on an empty stomach:
- Flushes toxins better than drinking water at other times.
- Speeds up metabolism enough to cause meaningful weight loss.
- Cures high blood pressure, diabetes, or arthritis.
- Prevents cancer or other major diseases.
How much should you drink?
There is no required amount. Many people comfortably drink 1–2 glasses (250–500 mL) after waking, while others simply drink when they feel thirsty. The key is staying well hydrated throughout the day.
For most healthy people, drinking water first thing in the morning is a healthy habit, but its benefits come mainly from good hydration—not from a special effect of having an empty stomach.
