What’s a good diet for guys looking to get shredded, sleep better, keep their heart healthy…you get the gist. Below, our Men’s Health nutrition advisors consult on what makes a 'good' diet, and a few of their favorites. First, What Makes a 'Good' Diet? The occasional cookie or cheeseburger isn’t going to derail your overall health goals. 6 Diets for Men, According to RDsFlexitarian plant-based diet for better performanceAbeyta calls the flexitarian plant-based diet one of the best diets for men aiming for performance.