Yoga philosophy begins with the idea of ahimsa. That is, it poses no risk to you or anyone. Many people take this to mean that they should avoid eating animal products.
This is a contentious topic in the yoga community. I believe it is a personal choice that each individual must make for themselves. If you're thinking of being a vegetarian, think about not just your own wellbeing, but also how your decision will affect people who live with you.
Vegetarianism should not be forced on others. Such offensive acts are not ahimsa in the strictest sense.
