A few years ago, a friend forwarded me a picture of Alicia Silverstone. The subject line was simple: body by vegan. It got my attention. Because even though I try to exercise two or three times a week, there remains that stubborn five pounds of fat that took hold right below my belly button while I was pregnant and never came off. Now I know that I’m active and healthy, and I knock wood daily for that. But there is a vain teenager inside of every woman. And on the day that my friend sent me Alicia Silverstone’s picture, that teen spoke up. I wanted to have a body by…