Blue Light Exposure Just Twice A Day Causes Insulin Resistance In Humans


Mar 18, 2013
USA / Europe
No need to elaborate, given how much Ray has written about red and blue light and their effects on metabolism. The key result from the study was that just 3 hours of exposure was enough to trigger that metabolic dysfunction. Imagine what happens at night when there is ambient blue light everywhere, including coming through the window from the streets. Of course, I don't even have to mention the 8-10 hours 5 days a week that every working person has to endure under the soul-sucking office fluorescent (blue) lights.

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

"...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.


Sep 11, 2013
Does that maybe mean that staring to a computer screen for hours in the day is problematic? I read that computer screens contain a lot of blue light.

Also, I wonder, the sun also contains a lot of blue light wavelengths, but maybe it is not problematic as it comes with red light as well?



Apr 30, 2015
Hmm. The question in my mind, is this blue light as absorbed through the retina? Or through the skin?


Jan 6, 2015
other than f.lux i changed windows color and firefox theme to red and it seems good at least on my eye and especially at nights.

nice study ,thanks haidut:)


Aug 5, 2015
San Francisco
Peat has written about the effect of red light potentially protecting from exposure to blue light.

Maybe using a red light (like from Red Light Man) would be a good idea when working under fluorescents (like now :???:)


Jan 6, 2015
i also turned off all gamma rays of my monitor, that one should be done on monitors settings i think.


Nov 28, 2015
sunlight is full spectrum and follows a batural diurnal rhythm both in rise and set as well as the frequencies that make it to you depending on its angle of inclination. morning contains most blue, evening more red. ever seen a blue or white sunset?
Sep 3, 2016
Cleveland, Ohio
I'm confused about what is "blue-light" and what is not. Is it blue-light if it just looks blue? And does using a red filter really help? Blue light from the sun or from fluorescent light doesn't look blue, so how can I tell when I'm being exposed to it? If using a red filter on the phone or computer helps, shouldn't one be used all the time?
Similar threads
Thread starter Title Forum Replies Date
tankasnowgod Simple, Easy And Free Way To Reduce Blue Light Exposure (and Increase Red) Red Light, Infrared, LLLT 33
dfspcc20 Morning And Evening Blue-Enriched Light Exposure Alters Metabolic Function Scientific Studies 1
M Is blue light causing internet addiction? Miscellaneous 2
joshquintanilla Found A Way To Block ALL Blue Light On IPhone Easily Light 36
B Methylene Blue And Red Light Cure Tinea Versicolor Scientific Studies 1
D Blue Light Protection From Computers Miscellaneous 10
M Blue Light Health 0
Mito Inactivation Of Three Emerging Viruses In Plasma By Methylene Blue Plus Visible Light Scientific Studies 10
haidut Blue Light Accelerates Aging And Reduces Lifespan By More Than 50% Scientific Studies 13
GorillaHead Any Ideas On How To Mitigate Blue Light Damage ? Ask For Help or Advice 4
Hans Red Light, Methylene Blue And Potassium Iodide Very Effective Against Drug Resistant Infection Scientific Studies 8
P Blue Light From Screens Metabolism 4
A Chemists Discover How Blue Light Speeds Blindness (by Increasing Oxygen) Scientific Studies 0
SOMO Methylene Blue And Red Light Aggravate DNA Damage? Ask For Help or Advice 9
Soren Methylene Blue And Light For Lymes Disease/Parkinson's? Mental Issues 0
walker_in_aus Topical Methylene Blue + Red Light For Skin Healing Supplements, Pharmaceutical Drugs 29
haidut Blocking Blue Light Can Cure Bipolar Disorder Scientific Studies 19
Herbie Red And Blue Light Experiences Red Light, Infrared, LLLT 8
Endocrinologist Methylene Blue And Red Light - Caution Scientific Studies 31
Hugh Johnson Hepatitis C And Human Immunodeficiency Virus RNA Degradation By Methylene Blue/light Treatment Of Hu Scientific Studies 1
Y Protection Against Neurodegeneration With Low-dose Methylene Blue And Near-infrared Light ( Scientific Studies 5
Y Using cellophane to filter blue light Ask For Help or Advice 1
haidut Blue light lethal to insects, while red / infrared is least harmful Light 0
J Computer Blue Light: Flux vs. Amber Filter Light 4
L Blue light reduces fatigue Articles & Scientific Studies 4
J Blue Light in Digital Devices Light 7
gately Blue Light, SAD, And Bilirubin Light 11
charlie Blue Light/Ultraviolet Blocking Sunglasses, Orange Lens Light 40
S Methylene Blue while on T3 meds Supplements 1
S How to dose with Health Natura methylene blue Ask For Help or Advice 7
S Elevator pitch for Methylene Blue. Ask For Help or Advice 3
Mito Methylene Blue Inhibits the SARS-CoV-2 Spike-ACE2 Protein Miscellaneous Health Discussions 6
Advocate2021 Oxidial/Methelyne Blue If Taking Cyproheptadine Supplements, Pharmaceutical Drugs 2
NodeCerebri Methylene Blue lowering nitric oxide too much? Supplements 1
Mr Joe What's the link between CO2, Methylene blue, ATP and Electricity (Ether) ? Ask For Help or Advice 2
P Methylene Blue On Hairline + Scar Reduction/help? Hair & Nails 4
N Safe To Use Infrared Sauna When Taking Methylene Blue? Supplements, Pharmaceutical Drugs 3
O Methylene Blue As An Anti-COVID-19 Mouthwash In Dental Practice Articles & Scientific Studies 0
Inaut Shilajit And Methylene Blue Supplements, Pharmaceutical Drugs 2
R J Informative Interview About Methylene Blue Miscellaneous Health Discussions 26
TacoVampire Waterpik And Methylene Blue Oral Health 2
bzmazu METHYLENE BLUE FOR COVID Viruses, Parasites, Fungus, Vaccines 1
A Methylene Blue USP Dosage Methylene Blue 13
R J Leucomethylene Blue For Covid And Other Respiratory Infections — Regular Oxidized M.B. Is Dangerous Scientific Studies 11
R J Nebulized Methylene Blue Methylene Blue 1
Jam Methylene Blue Has A Potent Antiviral Activity Against SARS-CoV-2 In The Absence Of UV-activation Methylene Blue 0
TheFatKid Breathing Issues With Methylene Blue Ask For Help or Advice 3
R Methylene Blue Suppliers Supplements, Pharmaceutical Drugs 15
O COVID-19 Should Be A Methylene Blue “promoter” Articles & Scientific Studies 5
Mauritio Methylene Blue Increases Thyroid , Decreases Estrogen And Prolactin Scientific Studies 40

Similar threads