Hopefully critical rather than judgmental--most obvious example, Jimmy Moore. He did his version of nutritional ketosis for a full year. It worked, for a full year. Then he changed a bunch of stuff, and said, stress is making this not work any more. Keto doesn't work for me without a kitchen scale.

I'm not saying other stuff doesn't happen and that this approach will get everyone where they want to go, just that you can't be certain that something stopped working for somebody unless you're certain they kept doing the same thing, what justifies criticizing Jimmy Moore in this for me is that people might take this "experiment" as evidence against an approach that Jimmy hasn't applied consistently. I don't think he even has to cheat--for me, just not measuring my heavy cream can get me in trouble. I can easily eat 2000 calories or so a day, feel satisfied and not gain weight, but I can easily take in an extra cup of heavy cream in a day in my coffee, almost half again the calories, without feeling stuffed.