Before anyone breathlessly gushes about their life-changing fasting regime, remember that this study was done on mice.
Not only that, more often than not, it turns out that the original claims turn out to be false or negligible at best. The latest weight fad was intermittent fasting. Turns out it isn't any better than any other weight loss regime. https://news.ycombinator.com/item?id=18537250
So the track record of people who study diets is abysmal in my experience.