Sunlight impacts the vitamin D pathway, which in turn influences testosterone, estrogen, and luteinizing hormone production, affecting mood and well-being.

“also through the sun's ability to impact the vitamin D pathway that then impinges on those testosterone estrogen and things like luteinizing hormone Pathways we don't have time to go into into all this now I covered this in an episode about testosterone and estrogen you have hormones such as lutenizing hormone which then stimulate the gonads the testes to the ovaries to make testosterone Endor estrogen the skin is a not so obvious player in this whole thing whereby external environmental stimuli such as the availability of sunlight which in most places in the world varies across the year can stimulate more or less vitamin D production luteinizing hormone production that can hinge on testosterone and estrogen production these pathways are one of the reasons why when we get the right amount of sunlight not too little not too much we feel better we feel better because certain hormones are being produced at certain levels when we're getting that sun exposure and when we don't get that sun exposure we have lower levels of those hormones”