A recent study has found that lack of sleep can decrease fat reduction up to 55 per cent. The study was conducted with a combination of diet and sleep restriction. Cutting down on sleep reduced, by over half, the volume of fat loss in participants. It was discovered that when the body is deprived of sleep, the body increases a hormone that reduces fat burning and physical activity.
Ten healthy, but overweight volunteers participated in the study for a period of four weeks. During this time, they were permitted to sleep for a little over eight hours in the first two weeks and a little more than five hours in the second fortnight.
The actual average they achieved in the first fortnight was seven hours, twenty-four minutes and five hours, fourteen minutes during the second fortnight. With enough sleep, nearly half of their weight loss was fat. When their sleep was shorter, they only a fifth of their weight loss was fat.
There was not any difference in the amount of weight loss between fortnights. The weight loss other than fat consisted mainly of muscle. So, it would seem that reducing sleep is not a good idea if you want to lose fat.
Reducing sleep appears to increase release of a hormone known as ghrelin. High levels of ghrelin suppress physical activity, increase hunger, and encourage fat retention. The study validated these conclusions by pointing out that participants lost less fat during periods of light sleep and that they had increased hunger pangs. Study directors believe that, have they been given access to more food, the participants may have lost even less fat.
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