Not exactly, it's professionals understanding physiology and recognizing the best ways to tune their bodies before a show. This is quite different from shills and book authors pitching dietary advice to millions of normal people without any desire to prep themselves for a show. It seems there is a misconception about what a fad is. It literally has nothing to do with what you eat, it's how the idea is pitched. And more importantly, who the target demographic is.
People like Gary Taubes, Mark Sisson, or Shawn Baker aren't trying to reel in professional bodybuilders. They know that's a lost cause because the bodybuilders already know more than they do, lol. Most of them, if not all of them, also already look better and have better bodies than they do. These people specifically target overweight, working class westerners who are dealing with chronic issues and promising a quick fix for it. While choosing to gloss over, if not entirely ignore, the aspects regarding it's difficulty to maintain, lack of scientific data, and adverse effects on blood work. Invalid Link Removed
Also I don't mean to pick on Taubes, Sisson, or Baker. Those are just the pushers that come to mind, they were popular back in my day. I don't keep track with who's popular in the low-carb spehere. But the profile can be applied to pretty much anyone. These people's target demographic isn't the guys who already look good. Bodybuilders harnessing ketosis to fine tune their physique doesn't really change the "faddness" behind how these diets rise and fall in public relations. Or the fact most people don't stick with it long-term.
Again, I would like to reiterate that fads are not hoaxes. It just a cultural phenomenon of overly zealous people (usually book authors making money) aggressivevly pushing dietary practices that are extremly hard to maintain in long term on desperate people with weight issues or health problems. They promise quick changes when they remove "x, y, z" from their diets, usually lacking rigorous scientific evidence, and may also cause adversed reactions in some people. Case in point, with ketoers it's typically their lipids that get blasted.