I don't know why my previous comments went all haywire, anyways, I agree that we need to avoid becoming zealots on both sides, very few people can/will do a 100% version of either diet. From my journey and research into this space though, it seems that meat should be the main food source for humans and is actually sustainable in the long run. Vegans begin having nutritional deficiencies after around 5 years, unless they supplement, which means it's a nutrient deficient diet. So eat veggies and some fruit if you want, but make sure you add plenty of fatty meat to that dish.