Kinetic:
My personal experience with vegetarianism went something like this...
I am a huge food nerd--I love cooking and I love eating good food. About 5-7 years ago I experimented with vegetarianism mostly because it was a type of cuisine I didn't have much experience with, and a girl I lived with was vegetarian so it seemed like a good time to try it out and expand my cooking repertoire a bit. I had also heard some offhand claims about vegetarianism being healthier, etc; most of the same stuff that a lot of people hear about, I suppose.
I learned how to cook a bunch of recipes and how to work with tofu and other ingredients. A lot of it was quite delicious.
However I always left every meal feeling super hungry. Granted, I wasn't composing each meal with an athlete's mind to training food, but I did have this roommate to help me, she had been a vegetarian for life (mostly since her vegetarian parents, when she was 2, took her to a slaughterhouse, but that is a topic for a totally different forum) so she knew how to cook meals in a balanced way.
I also left every meal having eaten probably 4-6 times more than I usually ate; most of it in the form of carbs (granted they were mostly vegetable carbs but still).
About 6 months into this, I developed a sudden and severe allergy to peanuts and to soy. My theory (although my doctor will not confirm or deny it) is that my experience with vegetarianism, where I tried to get my protein mostly from soy and peanuts, overloaded my body and caused a reaction. My reasons for believing this are because now--after being omnivorous again for several years--I can tolerate small amounts of peanuts and soy without a reaction, or with a very small reaction (a hive on my lip versus my throat closing up), whereas before it would cause throat and tongue swelling.
Obviously a ton of people out there are vegetarians and eat protein from soy and nut sources and are fine. I don't say my vegetarian streak necessarily "caused" my allergy but I believe (read that again--I believe... it hasn't been proven true, just a belief) that I may have had a predisposition that was aggravated by the massive amounts I was eating.
The biggest issue, besides the allergies, was that I just couldn't stand not eating meat. I missed it too much and pretty much felt like I was starving the whole time. Perhaps with more attention to composing my meals properly for my body's needs that wouldn't have happened, but for me personally I wasn't motivated to try experimenting with that because I didn't have a strong ethical or other reason to be vegetarian.
I have immense respect for people who are vegetarian for ethical reasons and live their beliefs; as I have respect for anyone who lives their beliefs honestly and genuinely. But for me personally, I do not share those beliefs and I know from experience that I love meat way too much to not have it in my diet.
It took me years to find a diet that really works for me, and I will tell you it doesn't fit in any kind of category. It's more rules of thumb than a labeled "diet" per se--lots of vegetables and lean proteins, dairy products, some fruits, few to no processed foods, and minimal sugars besides those naturally occurring in fruits. I eat whole-grain carbs in moderation, and there are a few "naughty" foods that I willingly allow simply because I like them too much to give them up. So I accept the fact that (a) I can only have them in moderation, and (b) my performance will not be optimized as a result. These foods are: coffee, French baguette and croissants (but only from France or from ONE bakery here in the city), wine and some spirits, and chocolate. On very very special occasions I will have a beer; usually 2-3 per year, tops. I also try to eat organic/free-range/local foods as often as I possibly can, although they can get expensive. Next summer I will have a garden and grow my own vegetables. With very few exceptions, I eat NO processed foods. I like my food to look as close to how it looked when it was alive as possible.
I don't always follow this diet but when I do it really works well for me. Like anyone else I have my weak moments and my weak phases of life. But I arrived at this diet by experimenting, seeing how things made me feel, reading a lot, doing research, talking to my doctor, etc. And it is a constant work in progress.
You asked for peoples' opinions, mine is the same as Chris's--try it and see if it works for you. Be willing to tweak it if necessary. If you don't have a strong ethical reason for being vegetarian, it is probably not the best diet for you, but only you know your body chemistry and how certain foods make you feel/affect your training. I just figured I'd share my personal experience with you to give you some fodder to consider as you make your decision.
Good luck with whatever you decide!
