I'll just eat a burger. If I don't, I know that I'm gonna try and sub with a ton of other things to fill my craving and that will be worse in the end.
If it's at home, I'll just swap the bread for my low carb Sara Lee 45 cal bread or something similar. If it's out in a restaurant, sometimes I'll order protein style or with wheat bread. I'll usually just make adjustments to the rest of my day to accommodate for it if I keep the bread. But I'll always tell them no mayo or just ask for it on the side.