Watching TV before bed makes you hungry for dessert.
Just one hour of exposure to artificial blue light at night, the kind of light produced by the our screens and light bulbs:
• increases sugar consumption
• raises blood sugar levels
• reduces glucose tolerance (a warning sign of pre-diabetes.) After the exposure to one hour of blue light, male rats drank more sugar that night than during the nights with no blue light exposure.
Acute exposure to blue light at night impairs glucose tolerance, alters insulin secretion and increase sugar intake in a diurnal rodent. Anayanci Masís-Vargas, David Hicks, Andries Kalsbeek, Jorge Mendoza, Light, Vision and the Brain Team, Presented July 2019, Society for the Study of Ingestive Behavior, Utrecht, Netherlands.