When I was younger I did actually try being vegan, lasted about two months. I can honestly say I have never felt so bad in my life: weak and tired. No, I wasn't just eating broccoli. I had soy and beans and all that stuff, but it just doesn't cut it.
To anyone who says being vegan is healthier I really want to give them a good shake. Healthier than what? Eating at McDonalds? Well duh! but healthier than eating an honestly balanced diet of animals that were farm raised, fed on real food, and ethically treated mixed with green vegetables and grains? I don't see how, you are just denying yourself additional nutrients.
Every long term vegan I have ever met looked like they were one step away from anorexia.
As for ethics... what is ethical? There is no objective answer to that, just limitless subjectives varying from culture to culture. I personally see nothing wrong with killing an animal so I can supplement my diet. That's just the reality of life.