Regardless of an individual's physical activity level, diet, sleep, or age, people who had most of their daily exposure to natural light between 8 a.m. and noon had significantly lower BMIs than those who got most of their exposure later in the day.
The reason: Natural light provides a boost to your circadian rhythms—or your body's internal clock—which is known to regulate your metabolism, hunger, and energy levels, says co-lead author, Giovanni Santostasi, Ph.D. In fact, previous studies have found that constant exposure to bright light later in the afternoon or at night can throw off your circadian clock and increase your risk of obesity.
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