I can personally attest to low-carb. I lost 40 pounds in two years. It wasn't easy. No diet is. Everyone told me I'd gain it right back and gave me visceral reactions when I told them how I did it and how it's been years now since I've switched back to a sensibly balanced diet to maintain it.
I don't think people want that particular diet to work. Granted, it's got its downsides. And you can do it in a very unhealthy way. But being 40 pounds overweight was probably worse than intermittent lower-carb with healthy(er) options like chicken caesar salads, stuffed peppers made with turkey, or tuna salad on celery. It just let me eat less calories without as much hunger.
I don't think people want that particular diet to work. Granted, it's got its downsides. And you can do it in a very unhealthy way. But being 40 pounds overweight was probably worse than intermittent lower-carb with healthy(er) options like chicken caesar salads, stuffed peppers made with turkey, or tuna salad on celery. It just let me eat less calories without as much hunger.