Everyone will come out of the woodwork and say that that 6 meals a day is the only way this can be done. It actually depends on what your schedule is like and whether or not you're hungry. I eat right at 6 meals a day including my post WO shake. That is on days that I train which is M-F. Sat and Sun are hit and miss, but I still eat 3 or so times a day. I'm just not as hungry on my off days and try to avoid over eating.
I say try each way for no less than 6 weeks and see what happens. Stick with which ever one works best for you.
Also remember that even just a handful of nuts or whatever can be counted as a meal.
Hope this helps.