A study has suggested that the timing, intensity and duration of exposure to light during the day are associated with an individual’s weight.

The study revealed that individuals who had most of their daily exposure to even moderately bright light in the morning were found to have a significantly lower body mass index compared to those with most of their light exposure later during the day.

The earlier the light exposure during the day, the lower the body mass index, reported co–lead author Kathryn Reid, research associate professor of neurology at Northwestern University Feinberg School of Medicine.

The impact of morning light exposure on the body weight was found to be independent of a person’s physical activity level, caloric intake, sleep timing, age or season. It was accountable for nearly 20% of an individual’s BMI.

One must get more bright light from 8 a.m. to noon. About 20 to 30 minutes of morning light is sufficient to affect the BMI. (Science Daily)