"You guys know that in the United States right now we've got a big time depression, suicide, and opiate problem. What most people don't realize is that this problem all links back to a chemical that's made in your eye and goes into your brain.

"The chemical's called POMC. […] This chemical is made in the brain and it basically breaks down to six different chemicals. […]

"There's other chemicals that are made in here but […] we make two really big chemicals in our eye initially that link to this story. So if you're not getting AM sunlight, […] from sunrise to about 10:00 AM, you're chronically deficient in it, you have an alteration in melatonin and dopamine. And it turns out depression is very associated with dopamine.

Well people don't understand about dopamine, is dopamine is created from the aromatic amino acid tyrosine and phenylalanine in humans. […]

"These aromatic amino acids are photon traps for this AM light. It turns out that melatonin has to first be programmed by AM light, but it doesn't act in the brain or the gut until light is gone at night for about four hours. So this is the reason why there's a brain-gut axis."

—Dr. Jack Kruse with Kriben Govender and Jame Shadrach @ 08:34–08:59 & 10:05–10:42 & 11:35–11:57 https://youtu.be/g_rlcavhGLs&t=514