You know, every single meal could be all you can eat assuming you are not a broke mother f*cker. How much would you normally eat? How about one big salad plate and one big plate of meat and veggies. That's probably more than normal, but it's not going to kill you.
This is way anal though. I suggest going for gusto. Eat as much as humanly possible. Then, when you feel like a fat, guilty, ashamed woman (think PP), you will have something bad to remember and thus deter future binges.
Do you have an eating disorder?