The human body loses weight during sleep primarily because of water loss. However, day to day weight fluctuations are different from long-term weight loss. On a daily basis, including during sleep, the average person loses just under 1 liter of water as it evaporates from the skin and through breathing.
As you sleep, your body burns calories, causing you to lose between 1 to 4 pounds of your weight overnight; this weight loss can be regarded as temporary weight loss because you need to consume fewer calories than you burn to avoid weight gain.
Some popular weight loss diets suggest that you can lose weight while sleeping. However, the majority of the weight you lose while sleeping may be water weight. That said, getting adequate sleep regularly may promote long-term weight loss.
People do lose weight during sleep. However, this is mostly due to water loss through breathing and sweating. While individuals do not burn much fat during sleep, sleep is a fundamental component of well-being, and a lack of it can make maintaining a moderate weight more difficult.
New research, published in 2022, found not getting enough sleep led to an increase in calorie intake, body fat, and belly fat. The researchers found people who slept four hours a night had a 9% increase in subcutaneous belly fat and an 11% increase in abdominal visceral fat, compared to those who slept 9 hours a night.
Fasting for a certain number of hours each day or eating just one meal a couple days a week, can help your body burn fat. And scientific evidence points to some health benefits, as well.
High-intensity interval training (HIIT): It is probably one of the fastest and most efficient ways to lose stomach fat and reduce the overall body fat percentage. HIIT is a high-intensity short period of exercise that usually doesn't exceed 30 minutes, with short breaks of recovery periods of 30-60 seconds.
“Everyone's weight fluctuates throughout the day, and especially from morning to night,” says dietitian Anne Danahy, MS, RDN. “The average change is 2 to 5 pounds, and it's due to fluid shifts throughout the day.” If you see fluctuations of less than 5 pounds, you needn't worry.
The triglycerides release fat as carbon dioxide and water atoms during fat metabolism or oxidation. In other words, fat leaves the body as carbon dioxide when you exhale. The fat which becomes water mixes into your circulation until it's lost as urine, tears, sweat and other bodily fluids.
Side sleeping: This position helps to improve sleep, lose weight and pain. back, avoid swelling in legs, buttocks, thighs. Sleeping on the left side is a good position for the digestive system, avoiding the accumulation of fat.
Sleeping naked has a slew of health benefits, including helping you to lose weight. A study conducted by the US National Institutes of Health found that keeping yourself cool while you sleep speeds the body's metabolism because your body creates more brown fat to keep you warm.
Your body comprises about 55–75% water, which accounts for a significant proportion of your weight ( 2 , 3 ). According to some estimates, over 80% of overnight weight loss may be due to water loss. That said, how much you lose while sleeping varies depending on your body composition and metabolic rate ( 4 ).
The bottom line. Although it may be theoretically possible, losing 1 pound (0.5 kg) of body fat per day would require you to significantly increase your physical activity and limit your food intake.
“Your skin is the largest organ in the body and absorbs fluid easily,” says Dr. Keith Kantor, a leading nutritionist and CEO of the Nutritional Addiction Mitigation Eating and Drinking (NAMED) program. “After a swim or a shower, your body can absorb 1 to 3 cups of water, increasing your true weight by a few pounds.”
You should step on the scale first thing in the morning. That's when you'll get your most accurate weight because your body has had the overnight hours to digest and process whatever you ate and drank the day before. And you should try to turn that step into a regular part of your routine.
Daily weigh-ins.
If you're really committed to losing weight, weighing yourself every day can be helpful. Research shows that people who weigh themselves every day have even more success with weight loss than those who weigh in once a week.
As against areas such as legs, face and arms, our stomach and abdominal regions possess beta cells that makes it difficult to reduce the fats easily and lose weight in these areas. However, as per research, belly fat is the most difficult to lose as the fat there is so much harder to break down.