Drinking Warm Water on an Empty Stomach: Myths, Realities, and Digestive Benefits
A Popular Morning Ritual
Drinking a glass of warm water on an empty stomach right upon waking up is widespread advice. But what do science and nutritional practice actually say about this ritual? Nutritionist Mouna Saïdi helps us separate fact from fiction.
What Warm Water REALLY Does to Your Body
Ingesting moderate-temperature water (neither boiling nor ice-cold) on an empty stomach has direct physiological effects:
- Kickstarts bowel movements: This is the number one benefit. For people suffering from constipation, warm water acts as a mild stimulant for intestinal muscles, facilitating morning transit.
- Cleansing and detoxification: Although the liver and kidneys already do this job very well, morning hydration helps fluidify the elimination of metabolic waste produced during the night.
- Soothing spasms: Heat helps relax smooth muscles, which can relieve digestive or even menstrual cramps.
Tip: Adding a few drops of lemon or some fresh ginger can improve the taste and provide a slight boost in vitamin C and antioxidants.
The Great Myth: Does Hot Water Burn Fat?
The answer is NO. This is one of the most persistent internet myths. Water (whether hot, warm, cold, or with lemon) contains no molecules capable of dissolving or burning fat stored in your fat cells. Fat loss is exclusively the result of an overall caloric deficit.
Beware of excess: It is useless (and even counterproductive and dangerous) to drink a whole liter of water at once upon waking up. A single large glass is more than enough to rehydrate the body after 8 hours of sleep.
In conclusion, warm water in the morning is an excellent hydration and digestive hygiene habit, but it is not a miracle cure for weight loss.