hi this is mary caite…im 14 years old. just was gonna tell u that i was the same way. over my friends house and during lunch at school i was never REALLY on the diet but i drank my formula. well while i was doing it it didnt really seem like a problem for me. but my family was seeing changes in my attitude. i would be tired all the time and cranky. id have mood swings and things like that. now that im following the diet better i realize how different i act. i have so much more energy and im not cranky or have mood swings. you should talk to your friend and tell her she would feel a lot better when she is on the diet.