Can light affect mood?

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Yes, light can significantly affect mood. explains that exposure to UVB light, particularly in the early and throughout the day, can boost mood by activating certain neural circuits in the brain that increase the release of mood-enhancing chemicals like dopamine and serotonin 1.

Furthermore, light exposure at the wrong times, especially during the night, can lead to a decrease in dopamine output and worsen mood. It's crucial to avoid artificial UVB light from 10:00 PM to 4:00 AM to prevent activation of the pathways that can induce depressive symptoms 1.

Additionally, research highlights that light exposure affects not only circadian rhythms but also has direct effects on mood regulation. Intrinsically photosensitive retinal ganglion cells in the eyes send information to brain areas like the hypothalamus and habenula, directly influencing mood by regulating the release of neurotransmitters like dopamine and serotonin 2 3. Overall, both daytime light exposure and nighttime dark exposure are essential for optimal mental health 4.

Light and Mood

Andrew discusses the impact of UVB light on mood with insights from Dr. Samer Hattar. UVB exposure throughout the day can elevate and maintain mood, while avoiding UVB light at night can prevent depression.
Huberman Lab
Using Light (Sunlight, Blue Light & Red Light) to Optimize Health | Huberman Lab Podcast #68
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