Caveman diet

Any of you tried this? Can you share some expertise and or advice about this.

Tell me OG is this just a waist of time or
Is it really a way to good health? Phone Post 3.0

I know a guy who swears by it, tells me his blood work wasn't good as far as cholesterol etc and he decided to try the caveman diet. Now he's in perfect health, off the charts even and losing weight eating bacon all the time. Lol seems ridiculous to me but who knows. :/ Phone Post 3.0