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Old 09-05-2009, 04:48 AM
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Default Midnight Snacks May be More Fattening than You Thought!

When it comes to weight gain, the timing of your meals may be just as important as what or how much you eat. According to a study of lab animals published online by the journal Obesity, eating during the hours that the body would naturally be sleeping may lead to excess weight gain.

In the first study to associate meal timing with degree of weight gain, sleep scientists at Northwestern University compared two groups of mice, each placed on opposite feeding schedules for a six-week period. Both groups were fed the same high-fat food, and both had the same amount of daily physical activity. The only difference: one group was fed during its normal 12-hour waking period, while the other rodents where fed while they should have been asleep. By the end of the study period, the latter group had gained more than twice as much weight as the mice that ate during active hours: 10.4 g, a 48% increase in body weight, versus 4.4 g, or a 20% gain in baseline weight.

. . .

The salient issue, says study co-author Fred Turek, may be the disruption of the body's internal clock, known as the circadian rhythm. Eating at inappropriate times may disturb the body's natural rhythm, setting off a string of metabolic reactions that ultimately lead to weight gain. "Because our bodies are naturally cued to eat at certain times of the day, dining at the wrong time might affect the body's ability to maintain its energy balance," he explains, meaning that our body starts to use its calories differently than it normally would. That in turn could cause fluctuations in numerous hormones, including an increase in ghrelin and a decrease in leptin — the two key hormones that govern appetite and satiety. The hunger hormone ghrelin, which is produced by the stomach, sends a "feed me" message to the brain; leptin, the satiety hormone, signals the brain to stop eating.

But while these hormones have been successfully manipulated in lab mice to prompt weight gain or loss, the same has not been true in humans. Experiments in which obese human patients were injected with leptin have failed, because the metabolic pathways that control hunger and fullness in people are far more complex than they are in mice. Knocking out one of, say, 50 such pathways through drug treatment just means the other 49 will eventually pick up the slack, says Dr. George Fielding, a bariatric surgeon at the NYU Program for Surgical Weight Loss.

. . .

Until future studies in humans bear out Turek's preliminary findings, Aronne suggests that avoiding post-dinner snacking is probably still a good strategy, regardless of size. Not only could it help prevent extra weight gain, it can also lower the risk of gastroesophageal reflux and other digestive problems that may compound sleep problems. Aronne further recommends taking well-balanced and evenly spread meals throughout the day, rather than consuming 50% or more of your daily calories at dinner or afterward, since that may also lead to unwanted pounds.

http://www.time.com/time/health/arti...wsletter-daily
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Old 09-06-2009, 09:30 AM
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oh so true. Hubby has gained lots of weight doing the eatting at night thing. Its a hard habit to break
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Old 09-07-2009, 07:01 PM
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Last time I had a midnight snack I was pregnant
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