I low carb, and I'll eat a chip. My will power is to the point where I can eat just one or two. And I'll eat it slowly and enjoy the hell out of it. (Except chilis' chips aren't that great, I've literally had better chips out of a bag.) But yeah, her cheating the previous day is atrocious when attempting a low carb diet that it negates any accomplishment from avoiding 3 chips. It's like saying:  I didn't eat a jelly bean today. See, I have will power, My boyfriend ate a bunch of jelly beans right in front of me. I beat that jelly bean craving. Tell me how awesome I am. Oh, I ate a whole cake and quart of ice cream yesterday, but I won't let that jelly bean beat me.