Lack of sleep may also affect the kind of
weight you lose. In another study at the
University of Chicago, researchers followed 10
overweight but healthy subjects who were
placed on a balanced diet, then observed in
two 14-day increments, one in which they got
about 7.5 hours of sleep, and another in
which they got five hours and 15 minutes.
During both periods, the subjects lost an
average of 6.6 pounds. But when they got
more sleep, they lost 3.1 pounds of fat,
whereas during the short-sleep period, they
lost only 1.3 pounds of fat.
Those who got more sleep reported less
hunger, which makes sense: When they got
enough sleep, their ghrelin levels stayed the
same. On the 5-hour nights, their ghrelin
levels rose by nine points. Since ghrelin also
promotes the retention of fat, researchers
theorize that a lack of sleep explains why the
non sleepers held on to body fat. This
happens because the diet-unfriendly hormone
reduces the number of calories you burn off
and increases glucose production.
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