I actually just watched this recently. When my sister went vegan when she was younger I thought she was CRAZY. Then I started having lots of health problems and was always tired and down, so I gave it a shot and eliminated all red meat, and I felt so energized. Then I took it further to eliminate poultry, which lead to no dairy, no eggs, to complete vegan.
It's so crazy, I never planned on it. I was just driven by how clear minded, and energized I felt, all the time.
Later learning the other benefits of being a vegan, just added to the benefits.
Plus, I was so surprised at how good vegan food can be. BEST desserts you e ever had ;)