In the right circumstances can be a very healthy and very simple way to live, requiring little energy and resources. For near a decade I lived on a diet of fresh fruits, dried fruits, vegetables, nuts and seeds, mostly eaten raw and in specific combinations.

However, different environments can make this way of life very difficult for many. I personally consumed much that was shipped in, and though I lived in an agricultural location, still needed to supplement at times from other global locations. Long winters can present a challenge for the maximum benefits to a vegan. Also, living in the Arizona desert for example, would provide other challenges. Without a very good new age food store providing a large variety of local and imported foods, many locations would prove difficult. If the entire world was organized around a vegan culture, and bounties were shipped and shared, much of the ill health supporting modern medicine would disappear. However that is not the world we presently live in.

Veganism in theory could provide for our needs, however a lightly omnivorous diet, lifestyle and agriculture system could also find success, an solve some sustainability problems in organic farming collectives. I presently am omnivorous consuming some dairy, limited poultry and occasionally meat, but I never pass up a chance to haul some manure into the garden to balance the system.

I personally find veganism to the point of limiting all animal products from the inputs of my life, to be over and unnecessarily restrictive, in my situation.

Different strokes for different folks.