How do drinking and anorexia make Knapp feel?

Anorexia was like alcohol in the sense that both things kept Knapp away from discovering her true feelings. When she was starving she couldn't think about her emotions or motives. Same with being drunk. While she was anorexic, Knapp drank a lot, but only in small spurts. She would eat nothing for long spurts, but then go on huge drinking and food binges.