I can tell you this about nutrition. When I was having severe blood sugar drops twice, three times a week, a medical doctor told me the issue was that I was letting 6 hours go by between meals and that I just couldn't go that long without food.

I would certainly hope a doctor would know what she was talking about when she said my low blood sugar was due to not eating often enough.

And this is something where the knowledge has been around forever. As a teen when I felt shaky and sweaty and disoriented my mother would insist I eat a sugar and a protein, the sugar to feel better immediately, the protein to keep me feeling better. She learned that from my grandmother, who was born in the 19-teens. So the need to eat and what to eat to stabilize your blood sugar has been general non-medical knowledge for close to 100 years.