Humans are omnivores.  While there are some nutritional needs to work around, we can pretty much thrive on just about any of the diets out there.  The Inuit did fine on mainly seal meat for centuries.  Some cultures in India thrived on vegetarian diets, and I know of countless elite athletes (and many pros) who are vegan also.  Cave men thrived on paleo diets and people did just fine on the food we had in the 1950s.  Just don't eat to much of it and go light on the sugar.