Get bright light exposure (natural sun and daylight!) between 8 a.m. and noon and your weight-control chances are much better. From Northwestern University School of Medicine: "The threshold for the link between light exposure and lower BMI was 500 lux, a measure of the amount and power of light. A room lit by a reading lamp and a TV might be 50 lux, an overcast day might be 1,000 lux, direct sunlight might be between 32,000 and 100,000 lux, experts say.
"That exposure could come from many sources, including morning light through the windows of a car or a lunchtime walk outside, Zee said. At the same time, it’s important to avoid brighter light later in the day or at night, which has been linked to increased obesity."
Read full report here.