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Eating an egg is identical to killing an animal for food, therefore vegetarians refuse to do it. It is -impossible- to get protein on a vegetarian diet. You can get calcium, fat, starch, and various other stuff, but you cannot get protein. That's why they have to take protein suppliments, otherwise they'd never be able to heal or grow. However there are vegetarians who refuse dairy products on the basis that it's an animal product and is therefore bad. But yes, dairy products would solve the bone problems, at least to a certain extent.
The fact of the matter is, one way or another, we need to eat meat. It contains things that you have to eat and otherwise must be supplimented, and those suppliments are made from animals anyway. If you leave them out completely, you'll find yourself with some serious health problems later on in life.
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Actually, soya and seitan are some of the best sources of high quality protein available. Tofu and Quorn contain mycoprotein which is purely a plant-based protein that promotes cell renewal and growth and gives 12 units of the 50 RDA. Wheat is one of the best sources of glutenated protein, giving 16 units of the recommended 50 units. Scientific research has actually found that people can reach their full growth potential on a vegetarian diet. Also, vegetarians have a 23% less chance of contracting heart disease, 36-50% less chance of contracting cancers, 37% less chance of clogged arteries and almost always have a much lower cholesterol number than meat eaters. Actually, in the 1996 American Medical Journal, 90-97% of heart disease and colon cancer could've been prevented by a vegetarian diet.
All in all, a vegetarian diet is healthier and a lot less fatty than a meat-eating diet. Overall, vegetarians have a higher life expectancy than meat-eaters and encounter many less health problems than their meat-eating counterparts.
Basically if you're vegetarian, you can expect to live longer, encounter less illness and have a low cholesterol.