Not naming names or anything, but when some people "do what they've been told" and "follow the rules" and still fail to make progress ... well, SOMEtimes they ARE actually doing it wrong.
Some of us have to be stricter than Sisson's allowed 80-20 rule. Some of us can't afford to assume we're absorbing our nutrients, even from the best foods. Some of us have to baby ourselves when times get tough, and not try to soldier through workOUTS on top of workING.
I see nutrition gurus post recipe after recipe for "healthy" junk food and think, this just perpetuates the temptation people have to snack! Perhaps i was an archtypal Spartan in a previous life, but when eating goes beyond being a pleasant necessity to being a form of entertainment, this is where the obesity-prone among us get into trouble. Yes, enjoy your cream and chocolate and butter, but bear in mind that your meat is more important; nut-flour-based desserts shouldn't be the centerpiece of your diet! NOURISH your body, for godsake!
If stress is getting you down, perhaps going for a run (or even a walk) isn't as good an idea as lolling in a hammock! Instead of "just do it" maybe we should "just say no." When "play" becomes joyless and just seems to wear you out, it could be that a weekend of couch-potatohood would be a much better idea. DO LESS -- it's not subversive.
Eating a non-toxic diet is only gonna take you part of the way. The rest of your life has to be non-toxic as well, if you're going to thrive -- your habits, or relationships, your profession, everything. Fix what you can, discard what you have to, and take care of yourself. Insist on it.
If the most acclaimed authority makes a pronouncement in favor of something that your body doesn't tolerate, that "authority" is WRONG, and your body is right. You're the only one who knows what your body is saying (and we'll assume that you interpret its message correctly). Doesn't matter if an absolute FLAKE advocates something -- if it works for you that's all that counts. YOU are the authority on YOU -- or if you're not, you'd better learn. Learn what works, and do THAT.