FOOD SMARTS FRESH FACE - WebMD

®
Sleep
Sense
Young men who pride themselves on
being able to skip sleep—whether
it’s to study, party, or play around on
Facebook—might want to change their
ways when they hear the new research
showing a link between sleep loss and
lowered testosterone levels.
Researchers leading the study measured
testosterone levels in a group of 10
healthy young men (average age 24) during
a week of normal sleep (eight hours
a night). Then the researchers measured
their testosterone levels during a week
in which the men had slept 10 hours
a night for three nights and five hours
for eight nights. After losing sleep, the
men’s testosterone levels were 10% to
15% lower than after the normal week of
sleep. The men also reported declines in
mood and vigor.
8
*in a nationwide survey; among those with a preference.
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WebMD the Magazine | September 2011
In men, testosterone is crucial for sexual
behavior, reproduction, and building
muscle mass, strength, and bone density.
Low testosterone levels are associated with
low energy, reduced libido, poor concentration,
and fatigue.
Starting around age 40, testosterone
levels naturally drop by one to two
percentage points a year; a 10% to 15%
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drop in one week is the equivalent of
aging 10 to 15 years.
Although the study was small,
researchers believe it suggests that longterm
sleep loss could negatively affect
men’s testosterone levels and well-being.
About 15% of adult workers regularly get
five hours of sleep or less each night.
Source: JAMA
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Comedians love to joke about how
people with Botox can’t show their
emotions because they can’t move their
facial muscles. But a new study shows a
not-so-funny side: Botox injections can
inhibit your ability to read others’
emotions, too.
The reason? One way we detect what
others are feeling is by mimicking their
facial expressions. And if you can’t move
your own facial muscles, you can’t
mimic others’ expressions enough to
empathize with them.
In the study, led by a psychologist at
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Source: Social Psychological and Personality Science
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