Many people ask me this question, particularly because it's a bit unusual in my culture. But my mother and father have both been vegetarian (my dad isn't anymore) and so it's always felt quite normal for me. They did not raise me vegetarian however and the choice has always been mine. I chose to become vegetarian myself when I was 21.
It happened whilst eating dinner at a friends house. My student friends at the time were very excited to be eating beef, something we could not usually afford. Seeing them so happy to be eating meat, made me realise I was not. I ate it anyway, not wanting to be a spoilsport, but didn't really like the taste, and felt awful afterwards. I got indigestion and gas and I realised I could no longer eat meat, even if it was cooked and served to me by a friend.
The decision coincided with my decision to travel to India to visit my Guru, and though not directly related I feel that being vegetarian reflects my spiritual commitment to a non violent life. I have been strictly vegetarian for three years now, and have been told that five years is easy, and after that people begin to crave meat agian. We'll see. I suspect the reason for such cravings is a lack of knowledge in our culture of how to cook wholesome satisfying meals without meat
In Ayurveda meat is not recomended as a daily food, but it does have it's place. Meat is traditionally used for treatment of diseases including luekemia and certain lung disorders and animal products are used in many medicinal formulas. This is, of course, a very contentious issue, and the decision is very personal. I suggest that meat is ok if it is chosen very carefully and eaten with great appreciation and without guilt.
If you don't actually want to be vegetarian, but agree that it is better for your body, mind and the planet just reducing your intake of meat to once a week will make a really big difference. Make sure you choose organic, free range, local and fresh sources of meat, and eat it with reverence for the animal and prayers for it's soul.
So that mentions a few of my reasons-spiritual, health and a general dislike of meat anyway. It's a very personal thing, and I'm not really sure words will explain it properly. But I'll continue this thread by expanding on those reasons and a few more individually and in a bit more detail.