Drinking Water on an Empty Stomach: What Does It Actually Do?
You may see claims that drinking water immediately after waking up can “detox” your body, flush your kidneys, melt fat, or cure disease. Those claims go far beyond the evidence.
Drinking water in the morning is perfectly fine and can contribute to your daily hydration, but your body doesn’t require an empty stomach for water to work.
A few potential benefits:
Rehydrates you after sleep: You lose water through breathing and normal overnight fluid loss.
May help constipation: Adequate fluid intake can help keep stools softer, particularly when you’re also getting enough dietary fiber. (niddk.nih.gov
)
May reduce overeating in some circumstances: Drinking water before a meal can increase feelings of fullness, although it isn’t a weight-loss treatment by itself. (cdc.gov
)
Supports normal kidney function: Your kidneys need adequate fluid to perform their normal filtering and waste-removal functions. (niddk.nih.gov
)
Is there a special benefit to drinking it before breakfast?
Not that has been firmly established. The important thing is getting an appropriate amount of fluid throughout the day rather than following a particular “empty-stomach” schedule.
Don’t force yourself to drink enormous quantities of water. Excessive water intake can dangerously lower blood sodium (hyponatremia), and people with certain heart or kidney conditions may have individualized fluid limits.
Bottom line: A glass of water after waking is a healthy, simple habit if you’re thirsty—but it isn’t a miracle detox or cure.
