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January 29th, 2013
05:01 AM ET
Meal times may affect weight loss successLosing weight may not be just about WHAT you eat but WHEN you eat it, according to a new study. Participants in the study who ate a bigger meal later in the day lost less weight than those who ate earlier. Study authors Marta Garaulet and Dr. Frank Scheer, director of the medical chronobiology program at Brigham and Women’s Hospital in Boston, followed 420 people in Spain during a 20-week weight loss treatment program. The participants were split into two groups – early eaters who ate lunch before 3 p.m. and late eaters who ate lunch after 3 p.m. In Spain, lunch is the biggest meal of the day, comprising about 40% of a person’s daily calories. The early eaters, on average, lost 25% more weight than the late eaters over the course of the study, according to Scheer. The study was published Tuesday in the International Journal of Obesity. Behind the results Did you know your fat tissue has a built-in clock? In fact, the majority of cells in your body run on a 24-hour schedule, Scheer says. The combination of all these body clocks is called the circadian system, and it’s controlled by a group of cells in your brain’s hypothalamus. But the “clocks” in individual organs’ cells can be altered by daily activity that doesn’t affect the control center. For instance, researchers have found that feeding animals during abnormal times can “reset” the clocks in their liver and pancreas, which are key to optimizing metabolism. When this happens, the brain’s central clock remains on schedule. This can result in a de-synchronization between the two. “That then could lead to abnormal weight gain or a decrease in weight loss,” Scheer says. Part of this could be due to the body’s ability to handle glucose, the type of sugar that usually comes from carbohydrates. Late eaters in the study showed significantly higher HOMA levels, an index of insulin resistance that’s used to identify diabetes. Your system is better able to cope with higher glucose levels in the morning, Scheer says, extracting sugar from the blood to use as energy. “The same meal load later in the day would not be received as well.” Genetic link Researchers have identified several genes that may play a role in obesity and sleep cycles – i.e. whether we’re early risers or night owls. One gene called the CLOCK gene affects our circadian rhythms. A rare variant of the gene – the “c” allele - has been linked to obesity. This minor allele was more common in the study’s late eaters. This gene could cause them to want to eat later in the day, Scheer says. Another explanation The late eaters in the study often ate less for breakfast or skipped breakfast all together. Past studies have shown that’s a recipe for diet disaster. Fasting for too long can put the body into so-called “storage mode.” People who skip breakfast are also more likely to overeat later, although the study authors did not find a significant difference in the overall calories both groups ate. Takeaway There are limitations to these results. The study was observational, meaning the researchers asked participants to record their own meals. Observational studies can link two items – like meal times and weight loss – but can’t show cause and effect. The study needs to be verified with a randomized controlled trial. That said, planning your meals for earlier in the day couldn’t hurt. “We should really seriously consider the effect of not only what we eat, but when we eat,” Scheer says. Try to follow the King, Prince, Pauper rule: eat breakfast like a king, lunch like a prince and dinner like a pauper.
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Get a behind-the-scenes look at the latest stories from CNN Chief Medical Correspondent, Dr. Sanjay Gupta, Senior Medical Correspondent Elizabeth Cohen and the CNN Medical Unit producers. They'll share news and views on health and medical trends - info that will help you take better care of yourself and the people you love.
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