Vegans?

I am seriously considering adopting the vegan lifestyle. Not only for a much healthier diet, but for a positive change as well. My sister*tried it for a few months, and while she was only doing it for animal rights, she ended up losing quite a bit of weight too, before it was too much for her and she binged on beef jerky, lol. Anybody have any comments/stories/advice/food ideas*they want to give me on this venture?