"To discover to the world something which deeply concerns it, and of which it was previously ignorant; to prove to it that it had been mistaken on some vital point of temporal or spiritual interest, is as important a service as a human being can render to his fellow creatures..."
John Stuart Mill, "On Liberty"
We all remember the youthful spiritual song Dem Bones, about the ankle bone being connected to the shin bone, the thigh bone being connected to the hip bone, etc. What the song didn’t include is the connection between the stomach and the brain. And it’s not just about what you eat. It's about the vast array of bacteria and microorganism that live in your gut, and the impact they have on how your brain works.