I too caved in to drinking beer(love it) after being on the Atkins plan after I had lost a good amount of weight. Wow I felt guilty. I fell apart over Labor Day weekend. Not only did I drink beer, but then proceded to continue down the slide by eating a bunch of pasta (my fav) woke up Tuesday morning and decided to get my head and body back in gear. Just because my friends don't care doesn't mean I should have that attitude. So now I don't. No more breaking down for me. I am back on induction because I felt the need to re-start. From that slip up It has taken me longer to get my body back into the swing of things.
Keep strong for yourself and not weak for others!
good luck!