One more irony of present life. If you ask someone to do Surya Namaskar, it is deemed as mere exercise or communal practice. Basically it is positive exposure to the source of life.
On the other hand, we succumb to artificial light thoughtlessly. 🙂
The Notification anxiety is ruling our minds. Check mobile before sleep, during sleep, after sleep. Check, check, check! 😀
We prefer even leisure time on gadgets by playing video games, chatting and watching movies.
And one fine day, when diabetes is detected, we blame climate change! 😀
Take care! Avoid unnecessary exposure to bright light. Esp after sunset. Never for children below 12!! They really don’t need gadgets!
Bright light exposure increased insulin resistance compared to dim light exposure in both the morning and the evening. In the evening, bright light also caused higher peak glucose (blood sugar) levels.
Insulin resistance is the body’s inability to adequately move glucose out of the bloodstream, resulting in a buildup of blood sugar. Over time, the excess blood glucose could result in increased body fat, weight gain and a higher risk for diabetes.

Morning and Evening Blue-Enriched Light Exposure Alters Metabolic Function in Normal Weight Adults

“Our findings show that insulin was unable to acutely bring glucose levels back to a baseline level following a meal with bright light exposure in the evening,” said first author Ivy Cheung, a postdoctoral fellow in neurology at Feinberg. “The results of this study emphasize that our lighting environment impacts our health outcomes.”


Increasing evidence points to associations between light-dark exposure patterns, feeding behavior, and metabolism. This study aimed to determine the acute effects of 3 hours of morning versus evening blue-enriched light exposure compared to dim light on hunger, metabolic function, and physiological arousal. Nineteen healthy adults completed this 4-day inpatient protocol under dim light conditions (<20lux). Participants were randomized to 3 hours of blue-enriched light exposure on Day 3 starting either 0.5 hours after wake (n = 9; morning group) or 10.5 hours after wake (n = 10; evening group). All participants remained in dim light on Day 2 to serve as their baseline. Subjective hunger and sleepiness scales were collected hourly. Blood was sampled at 30-minute intervals for 4 hours in association with the light exposure period for glucose, insulin, cortisol, leptin, and ghrelin. Homeostatic model assessment of insulin resistance (HOMA-IR) and area under the curve (AUC) for insulin, glucose, HOMA-IR and cortisol were calculated. Comparisons relative to baseline were done using t-tests and repeated measures ANOVAs. In both the morning and evening groups, insulin total area, HOMA-IR, and HOMA-IR AUC were increased and subjective sleepiness was reduced with blue-enriched light compared to dim light. The evening group, but not the morning group, had significantly higher glucose peak value during blue-enriched light exposure compared to dim light. There were no other significant differences between the morning or the evening groups in response to blue-enriched light exposure. Blue-enriched light exposure acutely alters glucose metabolism and sleepiness, however the mechanisms behind this relationship and its impacts on hunger and appetite regulation remain unclear. These results provide further support for a role of environmental light exposure in the regulation of metabolism.