I just went through a whole week of non stop hunger, no matter what I ate-I couldn't get rid of that feeling and I drink alot of water. I read in the book that if you feel this way, you're out of ketosis so I panicked. however, I lost 4.5 lbs this week so I don't think that is the case. Not sure what caused it but its better the last couple of days. Maybe you need to eat more with the exercising-thats what was suggested on here to me-to up my calories some.