We have and many other species have developed 24 hour biological rhythms, which are called circadian rhythms. Modern day artificial lights at night, as well as dimly lit indoor environments during the day, threaten to throw this carefully orchestrated rhythm completely off balance, which can have far-reaching effects on our health.
Your circadian rhythms needs bright light to reset themselves after a night’s sleep. This is why getting 30 minutes of morning sunlight is extremely beneficial to inform your internal clock that day has arrived. This is important for many reasons, including, as new research has highlighted, maintaining a healthy weight (and even losing weight).
BMI is calculated by dividing your weight in kilograms by the square of your height in meters. A recent study published by Northwestern University researchers found that people who had exposure to light in the morning were most likely to have a lower body mass index (BMI), regardless of how many calories they consumed, activity levels, or how long they slept.
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The benefit was most pronounced in early morning hours. BMI rose by 1.28 points for every hour that light exposure was delayed. The researchers recommended that people should strive to get light exposure between 8 a.m. and noon, for about 20 to 30 minutes.
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