1. You will start poring over ingredients as if they were scripture
2. You will have a boatload of stress added to every social event
3. You will learn to have endless patience
4. You will be constantly worried about their health
5. You will be forced to deal with the terror of childhood vegetables
Eggplant. Cauliflower. All your old enemies reassembled to battle with you once again. Yes, one of your magical vegan friends might make these horror foods palatable, but for the most part they are as bad as you remember. One does not eat purple.
6. However, you will learn that they also hate salad
It's not a meal. It's a punishment. You are making everyone unhappy!
7. And secretly, a majority of Vegans are good cooks
Long before Whole Foods roamed the earth, Vegans had to fend for themselves using nothing but their brains and ingenuity. Chances are a Vegan is more likely to be able to whip up something incredible from the six things remaining in the fridge than you yourself.
8. You will constantly have to sample fake meats or substitutes
You're going to have to learn to be tough and break some hearts. No, it doesn't taste like bacon. That isn't roughly close to mayo. And seriously, most of the stuff you eat tastes like cardboad
9. You will realize that most Vegans are normal accepting people
The chances are that if you have a "good" Vegan friend, they are going to excuse your screwing up and occasionally serving them something they can't eat. This is turn multiplies your guilt 1000%. Good on vegans though for overcoming their uptight image.
10. Except when they are not
11. You will come to grips with your own personal shame
Look, there is something incredibly galling about someone having the willpower to completely change their life, give up cheese and make healthy choices while you still like going to Wendy's. It's a tiny dark coal of envy that is going to cling to you for the rest of your life. Well, until you have another piece of Brie.