I suspect a connection with the intestinal flora. Bacteria in the intestinal flora are able to synthesize all kinds of neurotransmitters from carbohydrates. I

I suspect a connection with the intestinal flora. Bacteria in the intestinal flora are able to synthesize all kinds of neurotransmitters from carbohydrates. I myself become very lethargic under a normal carbohydrate-containing diet. On low carb I have a lot of motivation and a lot of energy.