Hey fam, remember this? Sunlight and the circadian rhythms in your skin
Tl;dr: During the day, when potential DNA damage from UV light is higher than at night, the circadian rhythms in your skin upregulate expression of enzymes which protect & repair DNA. They also downregulate proliferation because the last thing you want is for a harmful DNA mutation to be rapidly spread. All of this thanks to a robust circadian rhythm.
Time-Restricted Feeding Shifts the Skin Circadian Clock and Alters UVB-Induced DNA Damage (Wang et al., 2017)
In general, LIGHT entrains the central circadian clock and FOOD entrains peripheral clocks. That’s why we try to get a big breakfast and go outdoors in the morning (or mimic this as closely as possible).
And from the aforementioned blog post, there is a bona fide circadian rhythm in skin, too. Well it appears this one, similar to other peripheral tissues, is regulated in part by FOOD but is also influenced by LIGHT.
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