That's what's known as an anecdote. This is what's known as a counterexample. And one thing is certain: No method has 100% success. To me the more important question isn't what percentage of cases something addresses, but whether it's a self fix where the benefits outweigh the risks. The risks of intermittent fasting are relatively low, and it may have side benefits like prolonged lifespan and slower telomere degradation as shown in animal models. The risks of essentially hacking your own insulin production to upregulate it if you're not diabetic are not nearly as well understood. On an individual basis, whatever gets you to where you're happy is great. Personally I've fasted every day my entire adult life and still have to work to keep weight off. But when someone puts a slick marketing package on fasting or drugs or surgery or anything else, I have to question whether they really have my best interests at heart. And usually the answer is obviously not.