We do do "cheats" on occasion, and it is remarkable what havoc the 'carbage' (mostly grains) wreaks on our systems for the next few days. For me this is not an 'end' but more of a beginning, or at least a stop along the way.
giving up Pizza, Bagels, Pasta and Beer
Just TRY It! even if for only 2 or 3 weeks, you WILL feel a difference.