The only links are to bro science blogs and NO actual Pubmed links.
IIFYM = carbs-protein-fat, doesn't matter where they come from as long as it fits the individuals percentages.
Science shows it's flawed, but the Bro Science brothers are becoming so defensive about it they are shifting the goal posts now saying the quality of macros IS important.
This is a good run down.
"Now, what is wrong here?
I think that this entire dietary
cult is built on a shaky foundation.
First of all, it completely ignores the
quality of the foodstuff you put into your mouth.
Second of all, it falsely assumes that food, beside its macronutrient content, has no other value to your health. It only provides energy.
This approach completely ignores how food alters the
microbiome and how it affects gene expression. More on that in a bit…
Young people may get away with following IIFYM (and flexible dieting) in their
youth years. But even so, it is most likely they are going to pay the price later in life."
http://cristivlad.com/iifym-and-the-major-flaws-of-flexible-dieting/