IIFYM vs. Clean Eating: English Research Topic?

All fitness enthusiasts want to know how to achieve the best results. How to do so is where the topic gets controversial. Many people simply believe in clean eating, others do things like backwards dieting, and some like the 'if it fits your macros,' or IIFYM, approach which is something I would be interested in researching for a future English assignment.

This method, I believe, consists of having a set amount of fats, carbs, and proteins to eat each day and staying within those limits, allowing yourself to splurge on something no-so-clean if it fits in these daily set amounts of macronutrients. People like it because it helps keep them from binging, helps create a balanced lifestyle, and apparently allows them to best transform their bodies, more so than simply clean eating. 

Other than these few things, I don't know much about IIFYM, how to do it, and why it works for some people. I believe it would be interesting to compare the views of those who practice it and those who don't believe in it or prefer clean eating. Right now, I believe that clean eating is the way to go. Our bodies weren't meant to digest the processed foods we have today and either way they are still unhealthy. Ultimately I think those who see better results from IIFYM than they did with clean eating is because their nutrients was not appropriate before. In a way I see it as trying to cheat your body by providing it with the refined and unhealthy version of those macronutrients. Basically, you can't cheat the system because it knows when something is off. 

However I could most definitely be wrong. This method may consist of mainly clean eating with a few splurges here and there, or it may not. I have an extensive list of questions about IIFYM in comparison to eating clean. What are the rules of IIFYM and how are they determined? If this method does work well, then why? What do those who have experience with both approaches have to say? Because everyone's body is different, will some benefit from clean eating more than the other and vice versa, or is this applicable to most?

I did some simple internet searching and found a woman who wrote a blog post about her positive experience with switching from eating clean to IIFYM and she listed a number of links, many of which discussed how to approach it. I have yet to look through the sources, but her post is linked below.

"Jodiefuturefigure's Blog": https://jodiefuturefigure.wordpress.com/2013/08/03/the-iifym-directory/