Study links evening blue light exposure to increased hunger

June 2, 2014

A new study suggests that blue-enriched light exposure immediately before and during the evening meal may increase hunger and alter metabolism.

Results show that blue-enriched , compared with dim light exposure, was associated with an increase in that began 15 minutes after light onset and was still present almost two hours after the meal. Blue light exposure also decreased sleepiness and resulted in higher measures of insulin resistance.

"It was very interesting to observe that a single three-hour exposure to blue-enriched light in the evening acutely impacted hunger and ," said study co-author Ivy Cheung, a doctoral candidate in the Interdepartmental Neuroscience program at Northwestern University in Chicago, Illinois. "These results are important because they suggest that manipulating environmental light exposure for humans may represent a novel approach of influencing food intake patterns and metabolism."

The research abstract was published recently in an online supplement of the journal Sleep and will be presented Tuesday, June 3, in Minneapolis, Minnesota, at SLEEP 2014, the 28th annual meeting of the Associated Professional Sleep Societies LLC.

The study group comprised 10 healthy adults with regular and eating schedules who received identical carbohydrate-rich isocaloric meals. They completed a four-day protocol under dim light conditions, which involved exposure to less than 20 lux during 16 hours awake and less than 3 lux during eight hours of sleep. On day three they were exposed to three hours of 260 lux, blue-enriched light starting 10.5 hours after waking up, and the effects were compared with exposure on day two.

Cheung noted that more research is needed to determine the mechanisms of action involved in the relationship between light exposure, hunger and metabolism.

Explore further: Study links workplace daylight exposure to sleep, activity and quality of life

More information: "Evening Blue-Enriched Light Exposure Increases Hunger and Alters Metabolism in Normal Weight Adults," Sleep, 2014.

Related Stories

Blue light may fight fatigue around the clock

February 3, 2014

Researchers from Brigham and Women's Hospital (BWH) have found that exposure to short wavelength, or blue light, during the biological day directly and immediately improves alertness and performance. These findings are published ...

Recommended for you

Losing sleep over climate change

May 26, 2017

Climate change may keep you awake—and not just metaphorically. Nights that are warmer than normal can harm human sleep, researchers show in a new paper, with the poor and elderly most affected. According to their findings, ...

Vitamin D supplements could help pain management

May 23, 2017

Vitamin D supplementation combined with good sleeping habits may help manage pain-related diseases. This paper published in the Journal of Endocrinology, reviews published research on the relationship between vitamin D levels, ...

Recommended daily protein intake too low for the elderly

May 23, 2017

You can find the recommended dietary allowance (RDA) on the nutrition labels of all your processed food. Food manufacturers are obliged to list the nutritional value of their products, and therefore must mention the percent ...

0 comments

Please sign in to add a comment. Registration is free, and takes less than a minute. Read more

Click here to reset your password.
Sign in to get notified via email when new comments are made.