I'm not convinced that this is true (careful monitoring necessary). As long as you cheat once a week, you should be fine. Especially so if your fats are coming from organic plant sources. What I notice from it is 1) increased mental efficiency/lack of mental fog and 2) decreased pain in my body. When I consume starches and sugars, my joints ache and I have increases in random shooting pains which are almost absent when I'm keto.