[andyoyo]

Most things have already been cleared up.

As far as eco-footprint, it takes around 10x the amount of food for meat then it does veg/fruit. For each tier, so if a lion only ate rabbits that ate veg/fruit a pound from the meat of the lion would = resources of 100lb veg/fruit

For nutrition, ever body reacts differently to foods. Many can live close to their best with a vegan diet as far as energy. Most bodies are very able to digest meat from evolution. A lot of bread is a very bad choice if you are a Vegan and trying to reach your energy potential, because humans are not used to it digested yet, its fairly recent. But with the current manufacturing & overpopulation, I'd suggest anyone to try out vegan for a few weeks, unless you are in a competitive sport / energy required activity that you can't sacrifice the change.