Is Blue Light Linked To Cancer & Other Diseases? Studies that can be found linked at the bottom of this page display a link between exposure to blue light at night, such as working the night shift, to types of cancer, diabetes, heart disease, and obesity. We also know that exposure to blue light suppresses the creation of melatonin, a hormone that assists with controlling our circadian rhythms, and there's some preliminary studies that suggest lower melatonin levels might explain the association with cancer and other diseases. That’s not all. A Harvard study identified preliminary results that link blue light to diabetes and possibly obesity. The researchers put

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