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Morning Light and Your Weight

If you want to slim down, you might try getting up earlier in the morning. A small study from Northwestern University in Chicago suggests that the timing of your daily exposure to moderate levels of light may influence body mass index (BMI) and body fat. The researchers found that people who received more exposure to moderate or high intensity light in the morning had a lower body mass index and a lower percentage of body fat than those who got most of their exposure to light later in the day. Only 23 adults, most of them women, mean age 26, participated in the study. All were healthy. They each wore a wrist monitor for seven days to determine the patterns of their exposure to light. Study co-author Ivy N. Cheung said that the results emphasize the importance of getting most of your exposure to moderate or higher intensity light early in the day, and that the new findings lend support to earlier evidence that changes in environmental light exposure may affect body weight regulation.