Vinny Guadagnino couldn’t be prouder to follow the keto diet! The self-proclaimed “Keto Guido,” who started an Instagram account by the same name in October, says he has lost 50 lbs since embracing the low-carb, moderate protein and high-fat eating plan, which has also been praised by Halle Berry and Kourtney Kardashian. “I’ve discovered the fountain of youth,”