This video in 2010 shows Dr. Mark Hyman talking to Google about his UltraMind Solution (which is mainly about the brain)
An important quote from the video (about 45 minutes in) is when he said …
“Your brain runs on nutrients … and if you don’t have adequate levels of nutrients, you can’t actually regulate your brain function properly. So, having adequate levels of nutrients, particularly the methylating nutrients, B6, folate, B12, vitamin D, omega-3 fats, these are critical for brain function.”