Experiments show that 'visceral fat increases' if sleep deprivation continues



Insufficient sleep is known to

cause great damage to the mind and body, and research results have also been reported that 'longer sleep reduces calorie intake and weight.' A new experiment conducted by a research team at the Mayo Clinic in the United States found that 'continuing sleep deprivation increases abdominal visceral fat .'

Effects of Experimental Sleep Restriction on Energy Intake, Energy Expenditure, and Visceral Obesity --ScienceDirect
https://www.sciencedirect.com/science/article/abs/pii/S0735109722003102

Lack of sleep increases unhealthy abdominal fat --Mayo Clinic News Network
https://newsnetwork.mayoclinic.org/discussion/lack-of-sleep-increases-unhealthy-abdominal-fat/

Scientists Reveal Another Consequence of Poor Sleep: More Belly Fat
https://www.sciencealert.com/study-reveals-another-consequence-of-poor-sleep-more-belly-fat

It is often pointed out that in Japan, the sleep time of adults is short even in the world, but in the United States, it is a problem that more than one-third of adults do not get enough sleep. A research team led by Dr. Naima Covassin , a cardiovascular researcher at the Mayo Clinic, has experimented with how sleep deprivation affects fat accumulation in the body.

In the study, 12 healthy and non-obese subjects aged 19 to 39 years were collected and a total of 21 days of experiments consisting of '4 days adaptation period, 14 days experiment period, and 3 days recovery period' were conducted. In this experiment, the subjects were divided into 'experimental group of 4 hours sleep per day' and 'control group of 9 hours sleep per day', and both groups were allowed to sleep up to 9 hours per day during the adaptation period. Subsequent experimental periods restricted sleep to their assigned time, and during the final recovery period, both groups allowed sleep for up to 9 hours. In addition, after an interval of 3 months, the experiment group and the control group were exchanged this time, and the experiment was conducted again for 21 days.



The research team seems to have tracked the subject's energy intake, consumption, body weight, body composition, fat distribution, etc. throughout the experiment, and also performed a CT scan for abdominal fat. As a result, the subjects assigned to the experimental group who slept for 4 hours a day increased their calorie intake during the experimental period by 300 kcal per day, and increased their protein intake by 13% and fat by 17%. It turned out that it was. On the other hand, the calories burned during the experiment period was almost the same as the adaptation period.

In addition, it was confirmed that in the experimental group in which the sleep time was limited to 4 hours, the total area of abdominal fat increased by 9% and the abdominal visceral fat increased by 11% compared with the control group in which the sleep time was limited to 9 hours. rice field. The weight gain was modest at around £ 1 (about 450g), so Dr. Covassin points out that this negative effect could have been missed if the abdominal fat had not been examined by CT scan.

Visceral fat, which accumulates around the internal organs deep in the abdomen, has been known to be involved in heart disease and metabolic diseases from past

studies , and is a more dangerous type of fat than general fat. Dr. Virend Somers of Mayo Clinic said, 'Our experimental results show that sleep deprivation increases caloric intake, slight weight gain, and significant abdominal visceral fat, even in young, healthy, and relatively lean subjects. It shows that it is associated with an increase. '' Normally, fat accumulates preferentially under the skin, but poor sleep seems to move fat to more dangerous visceral areas. '

In addition, the study found that caloric intake and body weight decreased at the end of the experimental period and into the recovery period, but visceral fat continued to increase during that time. This suggests that returning sleep to sufficient length does not reverse visceral fat accumulation, at least in the short term.



'Weighing alone gives you a false sense of security about the health effects of poor sleep, and repeated sleep deprivation can cause visceral fat to build up over the years,' said Dr. Covassin. There are also concerns about the potential impact of an increase in sleep deprivation. '

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