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Eating late at night adds weight

By Sudeep Chand

Health reporter, BBC News

According to research, late-night snacking really does put on weight.

The research team, from Northwestern University, Illinois, found that when you

eat, not just how you eat, could make a big difference.

Scientists found that when mice ate at unusual hours, they put on twice as much

weight, despite exercising and eating as much as others.

The study in the journal Obesity, is said to be the first to show directly that

there is a "wrong" time to eat.

How or why a person gains weight is very complicated - but it is clearly not

just calories in and calories out

Fred Turek Center for Sleep and Circadian Biology

Recent studies have suggested that circadian rhythms, the body's internal

clock, have a role in how our bodies use up energy. However, this had been

difficult to definitively pin down.

Deanna Arble, lead author of the study, said: "One of our research interests is

shift workers, who tend to be overweight.

"This got us thinking that eating at the wrong time of day might be

contributing to weight gain."

The experiment looked at two groups of mice over a six-week period. Both groups

were fed a high-fat diet, but at different times of the mice "waking cycle".

One group of mice ate at times when they would normally be asleep. They put on

twice as much weight.

This was despite them doing the same level of activity, and eating the same

amount of food, as the other mice.

Groundbreaking

The findings may have implications for people worried about their weight.

"How or why a person gains weight is very complicated, but it is clearly not

just calories in and calories out," said Fred Turek, from the Northwestern's

Center for Sleep and Circadian Biology, US, where the research took place.

"Better timing of meals could be a critical element in slowing the

ever-increasing incidence of obesity."

Tam Fry, from the National Obesity Forum, agreed. He said: "It is

groundbreaking. It really gets you thinking why this has not been done before.

"It could be very dramatic if it affects whether you are going to get fat or

not."

At this stage, the results could still be interpreted as controversial when

applied to humans.

The scientists now hope they can find out more about how the process works. It

is thought that sleep, hormones and body temperature all play a part in how we

gain weight.