Blue light at night increases the consumption of sweets in rats

rat
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A new study demonstrates that just one hour of exposure to blue light at night—the kind of light produced by the screens of many devices—raises blood sugar levels and increases sugar consumption in male rats. This study, led by Anayanci Masís-Vargas and colleagues from the University of Strasbourg and University of Amsterdam, was presented this week at the annual conference of the Society for the Study of Ingestive Behavior (SSIB) in Utrecht, Netherlands.

Previous research has shown a strong correlation between obesity and the levels of artificial at night. Much of the artificial light we are now exposed to comes from LED lights and LED screens, which emit high levels of blue light. Retinal cells of the eye are sensitive to this blue light and directly convey information to areas of the brain that regulate appetite

In their study, Masís-Vargas and colleagues, exposed rats to nighttime blue light and measured their and glucose tolerance the following day. It should be noted that, in order to better model human light exposure, the rats used in this study were diurnal, meaning awake during the day and asleep at night, rather than the typical nocturnal laboratory rats which are awake during nighttime hours. The authors found that after only one hour of nocturnal blue light exposure, glucose tolerance was altered in , a warning sign of pre-diabetes.

To investigate what happens with appetite control and food choice after exposure to blue light at night, the rats were given the option to choose among a nutritionally balanced food (standard rodent food), water, lard, and sugar water. After the exposure to blue light, they observed that the male animals drank more sugar that night than during the nights with no blue light exposure.

These studies show clearly that being exposed to light, especially blue light, at night is disruptive, and that at night may increase the tendency to snack on sugary foods and disrupt the ability to process sugar, especially in males. Though the rats were tested after only one night of light exposure, over time, this could lead to weight gain and the development of diabetes.

"Limiting the amount of time that we spend in front of screens at night is, for now, the best measure to protect ourselves from the harmful effects of blue light. In case it is necessary to be exposed to devices at night, I would recommend the use of apps and mode features on the devices, which turn the screens more orange and less blue or the use of filtering goggles that are already available in the market." Masís-Vargas says.


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More information: Acute exposure to blue light at night impairs glucose tolerance, alters insulin secretion and increase sugar intake in a diurnal rodent. Presented July 2019, Society for the Study of Ingestive Behavior, Utrecht, Netherlands.
Provided by Society for the Study of Ingestive Behavior
Citation: Blue light at night increases the consumption of sweets in rats (2019, July 9) retrieved 23 October 2019 from https://medicalxpress.com/news/2019-07-blue-night-consumption-sweets-rats.html
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