Does it fit your macros?
If it fits your macros is nothing short of a miracle diet. You mean to tell, uncertified crazy blogger guy, that I can eat poptarts and lose weight? Yes, I am your hero, thank me later. All IIFYM (for short) means is that you can eat whatever you want, so long as it fits into your macro nutrient calculations, which can be found, along with more information regarding IIFYM, at IIFYM.com.
My favorite diet food, yummy.