The headline is broadly defensible, but the qualifications matter. Effect sizes vary by population, the strongest claims rest on shorter trials, and credible voices push back on how it's typically framed.
So melatonin is a transducer. It's a communicator of how much light on average is in your physical environment. What this means is for people living in the northern hemisphere, you're getting more melatonin release in the winter months than you are in the summer months. So you have a calendar system that is based in a hormone and that hormone is using light in order to determine where you are in that journey around the sun.
Every Sunday: the week’s new conflicts and verdict changes — and nothing else.
Native comments, Twitter mentions, and Reddit threads about this claim — surfaced together so the conversation isn't fragmented across platforms.
Bookmarking — the dossier-vs-overview split is the right call. Most of the time I want overview; sometimes I want receipts.
Would love a "what would change this verdict" RSS feed. Sign me up if it exists.
Light arriving on the eyes is absorbed by a particular cell type called the intrinsically photosensitive ganglen cell. It's just a name. You don't need to know the name, but if you want, it's the so-called intrinsically photosensitive ganglen cell, also called the melanopsin cell, because it contains an opsin, a photo pigment that absorbs shortwavelength light that arrives through sunlight. Those cells communicate to particular stations in the brain that in turn can connect to your so-called pineal gland, which is this little P-sized gland in the middle of your brain that releases a hormone called melatonin.