Eat Late, Put on Weight?
Study Shows Eating at the 'Wrong' Time of Day Could Lead to Weight Gain
WebMD News Archive
'Right' Time vs. 'Wrong' Time continued...
The only variable, she says, was when the food was consumed.
Arble can't say for sure why the mice that ate at the ''wrong'' time gained
so much more weight. ''We speculate that it's the interplay between body
temperature, metabolic hormones such as leptin, and the sleep-wake cycle," she
For humans, nighttime is a time for rest, as the body temperature declines,
she says. "Eating at night is contradicting your body's natural circadian
rhythm,'' she says. "The leptin levels are starting to rise, and are supposed
to be discouraging you from eating." Rising leptin levels suppress
She is hopeful that other researchers will focus on the same concept in
human studies. "If it turns out to be a major factor,'' she says of the food
timing, ''it will be a great way to help weight maintenance and maybe weight
loss. It would be a fairly simple behavior modification, to move the time you
But night-time eating would be one factor among many contributing to weight
gain, Arble tells WebMD. "I don't want people to read this study and think 'Oh,
I can eat as much as I want as long as it's the right time of day.'"
''Eating too much late at night is not good," says Arline D. Salbe, PhD, a
senior research fellow at the Kronos Longevity Research Institute in Phoenix,
who has also researched and published on the topic.
''In a simple but elegant study design using mice, Arble [and her
colleagues] have confirmed our own results in humans that nighttime eating is a
risk for weight gain," says Salbe. "As modern lifestyles continue to modify
work and sleep patterns, the risk of weight gain from nighttime energy intake
becomes more relevant to greater numbers of people," she tells WebMD.
In her own study, Salbe and her colleagues evaluated the food intake of 94
people over a three-day period while they stayed in a clinical research unit
and were allowed to eat as much as they wished. They found that 29 were night
eaters, defined as those who ate between 11 p.m. and 5 a.m. on at least one of
the three days; 65 were not night eaters.