But perhaps other things could be playing into it, as well. Gut dysbiosis seems like pretty much a disaster all round—as well as probably being far more common than is generally realized. Apparently anyone diagnosed with coeliac disease, which is a pretty extreme example of a damaged gut, is now supposed to be automatically screened for osteoporosis:
What People With Celiac Disease Need to Know About Osteoporosis
I don't claim to know much about the subject but the more I find out the more my opinion of the medical profession goes down. I mean (a) they're not generally looking for or finding serious gut conditions like that and (b) they seem far too ready to hand out antibiotics (and without warning the patient to take a probiotic), which we know can kill off good bacteria. Again a disclaimer—who am I?—but I do sometimes wonder if antibiotics really help that often and there must be some doubt as to whether they don't almost always also do some harm. (And if they do, then that's a heritable harm, since you acquire your flora from your mother.)
The GPs round here hand out levothyroxine without pausing for a second to try to find out why the patient has a hypothyroid condition. And do they tell them to be sure to take vitamin A, since they won't be able to convert beta-carotene efficiently, or to avoid goitrogens such as soy? No. Someone told me recently that she'd been prescribed statins for her "high cholesterol". She'd already been on one and the "side effects" (sc. some of the effects) were so severe, that she had to stop it. So now she's on another. Now I know for a fact that there's never been a study that indicates that lowering cholesterol's helpful for women at all. I didn't have the heart to ask her whether her doctor told her to take CoQ10, since statins deplete that, and it's kind of a vital nutrient. I'll bet not; but, heck, I'm not a doctor and it's not my business to go round giving amateur prescriptions. It'd only annoy people anyway.
Maybe I'm getting jaded, but I'm starting to see the medical profession as part of the problem—and not only as regards outdated (and, let's be frank, never actually evidence-based) dietary advice. I think they mean well, but it's ten minutes in and out and "Next please", and look for something that removes symptoms. They evidently assume that the pharmaceutical companies are working for the common good, too. I think in an age when people can research things themselves on the Internet, the public is going to get more and more sceptical.