You're correct, many things play into it, but in the US we eat SO MUCH protein that, since the body cannot store it, the protein has to be excreted through the urine which takes a huge amount of calcium to keep the Ph correct. That's why milk is a bad thing for people with osteoporosis, unless you need all the protein in the milk--which most of us don't--then it takes all the calcium in the milk and some extra out of the body in order to excrete the excess milk protein. I should have been more precise: in rich, heavy meat-eating cultures, protein is a primary cause/contributing factor in the development of osteoporosis. Sorry.

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Research has not shown that complementing amino acids to get "complete" proteins in each meal is not necessary.

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Oh, I can see that. I realize that's how what I wrote came off. I really meant more that people need to balance foods in order to get complete proteins in their diets, not at the individual meal level.

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