New study links artificial light at night with weight gain in women

Dr. Jennifer Ashton discusses what women should know about a new study that suggests blue and artificial lights at night could be linked to weight gain.
2:31 | 06/11/19

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Transcript for New study links artificial light at night with weight gain in women
George, over to you! Okay. A gma health alert. Two headlines this morning about one says that having a light on while you sleep could increase your waistline. The other, genetics may not play as big of a role as we thought. Dr. Jen is here. Let's talk about light. So interesting. Here is the actual study in Jama internal medicine. They lookeded a over 43,000 women and really trying to make -- ask the question S there a connection between artificial light exposure while we're sleeping and weight gain and obesity. And what they found, any exposure to artificial light while we sleep. A night light, street lights outside, sleeping with the television on. 17% more likely to gain weight. We think it suppresses the worst, people who fall asleep with the TV on. Those people gain average of 11 pounds over a five-year period. When you talk about a way to target obesity. We hear so much about diet and exercise. We don't think about the things that go on while we are sleeping. Darkness. I just got a black out shade a couple nights ago. It has made a world of difference. You thought you slept weapon before. Yeah. So I learned the same thing. I figure, I'm asleep. I never sleep later than 5:00 in the morning. Why do I need shade? Darkness is very, very important. Even that we are exposed to while sleeping. Up with, eye mask. They look funny but they can work. Black out shades or drapes. Very, very important. Turn off your electronics, if you have a compute their goes in sleep mode that has a light on the screen. Cover it and dim the alarm clocks. Everyone the dim can expose us to light. The other big headline, genetics. You know, I have a degree in this is the holy grail. People are asking S there a diet or way of eating that is good for your code? Think they that genetics has a 30% to 70% effect for risk or obesity. Could you see a diet for you in the future? Yeah, but it's not ready for prime time. Diet and exercise. That balance, thanks a lot. Ginger? County right now.

This transcript has been automatically generated and may not be 100% accurate.

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