I also think she said we need some carbs to help with "low serotonin" state that is the Schwarzbein 1 (first book she wrote).
I definitely feel better with some carbs. I think I have this low serotonin state she talks about because of longterm use of coffee/caffeine. I am currently trying to "self medicate" with black tea instead, then hope to wean off it at some future point....