whats everyones opinion of this? over on bodybuilding.com its practically gospel, but then again i've no idea how there compares to here (ie they might all be clueless). my observations of BB.com are that it seems more relaxed, with diets focusing more on getting what you need rather than eliminating what you dont, but at the same time its quite common to see things accepted over here and apparently disproved as myths over there.
anyway, if anyones not familiar with IIFYM, then basically the idea is that once you've consumed your written out macro amounts for the day (and this is based on the assumption that you're working towards amounts in grams, rather than percentage, eg 40/40/20), you might have some leftover calories (and if you dont, then IIFYM is not applicable). now this is the important bit: you can fill up those calories with whatever the hell you like, protein, fat or carb, high gi or low, even sat/trans/hydrogonated fats are fine.
it is recommended, for general wellbeing reasons, that most of your diet should still come from traditionally 'clean' sources, but if you dont care about that so much, then if you can work ice cream, big macs etc into your macros then it will not affect body compostion in any way. yes, thats right, you dont have to pay attention to types of fats and carbs.
to be honest, this sounds like a really very bad idea to me. of course, i know incredibly little compared to most of you on here, but still, i fail to see how carbs and sat/trans/hydrogonated fats together could not affect progress in any way, not to mention sugar and white stuff aswell. naturally, it would be the most awesome thing ever if this was true, but i need convincing.