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

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

June 3, 2013
A new study demonstrates a strong relationship between workplace daylight exposure and office workers' sleep, activity and quality of life.

People exposed to earlier sunlight are leaner than those who get afternoon light

April 2, 2014
A surprising new strategy for managing your weight? Bright morning light. A new Northwestern Medicine study reports the timing, intensity and duration of your light exposure during the day is linked to your weight—the first ...

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 ...

Short-wavelength light increases beneficial stress hormone response in sleep-restricted adolescents

October 25, 2012
Adolescents can be chronically sleep deprived because of their inability to fall asleep early in combination with fixed wakeup times on school days. According to the Centers for Disease Control (CDC), almost 70 percent of ...

Sleep apnea plus dim light at night increases depression, anxiety in mice

July 16, 2013
(Medical Xpress)—New research suggests the estimated 12 million Americans who have obstructive sleep apnea should take better care to sleep in a very dark room. Scientists at The Ohio State University Wexner Medical Center ...

Recommended for you

Breathing dirty air may harm kidneys, study finds

September 21, 2017
Outdoor air pollution has long been linked to major health conditions such as heart disease, stroke, cancer, asthma and chronic obstructive pulmonary disease. A new study now adds kidney disease to the list, according to ...

Excess dietary manganese promotes staph heart infection

September 21, 2017
Too much dietary manganese—an essential trace mineral found in leafy green vegetables, fruits and nuts—promotes infection of the heart by the bacterium Staphylococcus aureus ("staph").

Being active saves lives whether a gym workout, walking to work or washing the floor

September 21, 2017
Physical activity of any kind can prevent heart disease and death, says a large international study involving more than 130,000 people from 17 countries published this week in The Lancet.

Frequent blood donations safe for some, but not all

September 21, 2017
(HealthDay)—Some people may safely donate blood as often as every eight weeks—but that may not be a healthy choice for all, a new study suggests.

Higher manganese levels in children correlate with lower IQ scores, study finds

September 21, 2017
A study led by environmental health researchers at the University of Cincinnati (UC) College of Medicine finds that children in East Liverpool, Ohio with higher levels of Manganese (Mn) had lower IQ scores. The research appears ...

Higher levels of fluoride in pregnant woman linked to lower intelligence in their children

September 20, 2017
Fluoride in the urine of pregnant women shows a correlation with lower measures of intelligence in their children, according to University of Toronto researchers who conducted the first study of its kind and size to examine ...

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.