I have always felt that most of proposed benefits of the keto diet are largely just a result of "giving a shit." People go through lives eating garbage all the time, laying around feeling bloated and crappy. Then jump onto <insert any miracle diet> and after a few weeks feel amazing. The secret is they swapped from shoveling garbage into themselves with becoming relatively picky about what they're willing to put in their bodies. Suddenly they look better and feel better, and want to double down on looking and feeling better.

I myself did the keto diet and found success with it, but then I transitioned to just more of a selective generalized diet and experienced identical effects. Keto was just the first time I'd ever had a set of rules to apply to the food I ate, which was ultimately the actual training I needed.