New research has uncovered the basis of the relationship of sleep to loss of weight. It turns out that sleep deprivation creates an imbalance in certain hormones that govern appetite.
Dr. Shahrad Teheri, an endocrinologist at Bristol University, found that with less sleep, there is more ghrelin in the blood, a hormone secreted by the stomach that creates hunger sensations. He also found less leptin in the blood, a hormone created by fat cells that send satiation messages to the brain.
In another study, conducted at the University of Chicago's sleep laboratory, it was found that after a single night of insomnia, folks showed this same pattern of hunger-making hormones in the blood. When volunteers were made to sleep only four hours a night for three nights in a row, they would awaken with complaints of being hungry.
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