When I was younger and training very heavily in some sports, I experimented a bit with different diets. Bottom-line the more meat heavy my diet, the faster I would heal from injuries -- radically so. For a while I went on a low-carb diet and ate a <i>very</i> heavy animal protein diet. I shed pounds, had absolutely unstoppable stamina, had far <i>fewer</i> injuries, stretching improved, basically never bruised, and healed from sports injuries that would have taken weeks in days. I felt like Wolverine.<p>I also felt like a grease grenade all the time and got tired of the diet which is why I stopped, but it was definitely superhuman for me.<p>I felt the worst in this sports context was when I experimented with a vegan/vegetarian diets. The effects were virtually the exact opposite. I'm sure with a nutritionist and more dedication I could have overcome many of these issues, but I found building a decent diet harder and required more effort.