Study shows 5 times greater weight loss occurs by drinking warm water

Telling someone who is unwell to "drink more warm water" might seem dismissive, but science proves that drinking warm water really is more beneficial. A study found that overweight individuals who drank a cup of warm water after meals lost up to 5 times more weight. Drinking water boosts metabolism and suppresses appetite, making weight loss efforts more effective. When is the best time to drink, and how much is most effective?

Is there scientific evidence that drinking warm water aids weight loss? A 2023 study published in the international journal Biomedicine divided 50 overweight adults into two groups. One group drank 200-250ml of warm water after each meal, while the other group drank the same amount of room temperature water.

After 3 months, the weight loss results in the warm water group were significantly greater than in the room temperature group. Participants in the "warm water group" saw their average weight drop significantly from 76.29kg to 73.37kg, a loss of 2.92kg, and their BMI also decreased noticeably. The "room temperature water group" lost only an average of 0.56kg. The study demonstrated that drinking warm water after meals aids weight loss without significant side effects, possibly because warm water can relieve pressure in the esophagus and promote relaxation and peristalsis in the digestive tract.

5 Mechanisms by Which Drinking More Water Accelerates Fat Burning

It's common knowledge that drinking plenty of water is good for you. Even without drinking warm water, people who generally drink more water during the day tend to have more success with weight loss than those who don't. The People's Daily Health Client compiled opinions from multiple doctors and experts to explain the 5 mechanisms by which drinking water enhances weight loss effects.

1. Suppresses Appetite: Water acts as a natural appetite suppressant. The brain can sometimes confuse signals for thirst and hunger. Sudden hunger pangs before a meal might actually be a warning sign of dehydration. Drinking a glass of water first may cause this hunger sensation to naturally disappear.
2. Reduces Calorie Intake: Besides drinking water after meals to promote weight loss, drinking water before meals can also help reduce calorie intake and aid weight control. One study found that on a low-calorie diet, drinking 500ml of plain water 20 minutes before each meal for 12 weeks led to an additional weight loss of about 2kg.
3. Replaces Sugary Drinks: Research shows that without deliberately starving oneself or changing one's normal diet, simply replacing daily sugary drinks like soda, milk tea, and juice with plain water for 6 months resulted in an average BMI decrease of 0.31. Replacing them with other unsweetened drinks has a similar effect.
4. Boosts Metabolism: All chemical reactions in the human body, including the breakdown and metabolism of fat, are inseparable from the participation of water molecules. Therefore, having adequate hydration ensures the efficiency of fat breakdown and its conversion into energy for the body. Conversely, dehydration naturally slows down the rate of fat metabolism.
5. Enhances Exercise Performance: Even mild dehydration can significantly decrease physical performance, rapidly increase fatigue, and cause lack of focus, all hindering exercise performance. Adequate water maintains electrolyte balance, lubricates joints, and helps regulate body temperature, giving the body the strength and endurance to complete workouts and burn more calories.

Experts Advise: 5 Optimal Times to Drink Water for Maximum Fat Burning

Experts suggest making drinking water a habit, not just something you do to quench thirst. This small change is easier than any diet method but can be highly effective. On days that aren't too hot or dry, the recommended daily water intake for generally sedentary adult men is 1500-1700ml, and for women, it's 1500ml. If you exercise heavily, sweat a lot, or the weather is hot, you need to supplement. Plain water is best, or very lightly brewed tea is also acceptable, but other drinks should not replace water. The water temperature should be between 10-40°C; drinking water over 65°C increases the risk of esophageal cancer.

When is the best time to drink water?

• After waking up in the morning: Drink a glass of warm water to replenish fluids lost overnight and awaken your metabolism.
• 30 minutes before meals: Drink 300-500ml of plain water to increase satiety and effectively control food intake.
• Around exercise: Replenish 500ml of water 1 hour before exercise; drink small amounts frequently during exercise; replenish generously after exercise to make up for fluid loss.
• When feeling hungry: Drink a glass of water first, wait 10 minutes, and see if the hunger subsides before eating.
• When feeling tired: It could be a sign of dehydration. Drinking a glass of warm water can effectively alleviate fatigue.