being a vegetarian is extremly unhealthy over a long period of time. there are amino acids that your body needs that it can only get from meats.
rub your tongue across the top row of your teeth.. feel the sharp ones? Thats not for lettuce sugar plum.
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Your statement about aminos isn't quite accurate. Yes, there are essential amino acids that the body can't manufacture. They must come from food; but, that isn't limited to meat (or other animal products), though getting them from meat is easier.
With the exception of soy, vegetables are incomplete proteins, which means they must be combined with grains or other veggies to make a complete protein source (with each containing the essential amino acids that the other lacks).
As for health problems, I recall reading that members of a certain Christian demonimation (known for practising vegetarianism) tend to live 11 years longer than their meat-eating counterparts.