Agree lack of nutrient may result in bone loss from long distance running, but in general even being sedentary with calcium and vit D deficiency are extremely bad for bone health or worst.
Agree long distance can affect boen health, especially as you mentioned lack calcium and vit D. But the main cause is catabolism due to low fuel in the blood. Intra workout with highly dense calories fuel is recommended when doing long runs.
Hence BMI is the signal. If you were in high BMI whole life and sedentary, BMD might be less of a concern. Though you may have other health issues.
Nevertheless, a DEXA scan is highly recommended especially those with low BMI. At least you have a baseline BMD to compare progression with running.
So if BMD is poor and you happen to have low BMI while running high mileage, the next best course of actions are to reduce mileage, focus on increasing BMI and build more muscles.
Best is to screen BMD occasionally if really going for endurance running soley for the long term (and no other forms of training)....coz will never confirm and know whether diet/supplementation is working effectively or not also, or like in the vid's case any other condition.
Even RA rheumatic arthritis can lower density....due to the chronic systemic inflammation. Or for that matter, any other similar comorbidities that involve chronic systemic inflammation. Can also screw up other things, one other thing that was screwed up in my wife's case was things like Haemoglobin (anemia), and it got to pretty dangerous levels.
And in not high levels of RA, it is subclinical and be unchecked for decades, and thus the BMD lagi affected as well and lagi exacerbated due to other things like diet/supp endurance running etc.
So it might not be 1 sole reason also.
These things dont go southward in a matter of months or even few years. Is really a very long period of time. Cheap cheap, that time my wife did (i think only last year) was what.....$160 or so if i remember correctly, somemore was private (Mount Elizabeth). I asked the rheumatologist why must check, he said must check, coz some people do overdo things to mitigate their medical condition....esp he knows our sporty background now (I wear my cycling outfit there coz my kid and I cycle there past few times).
Women after age 40/50 lagi higher risk.
So if dont check, we'll never know, doctor also wont know, nobody knows......just guess nia.
Forget about simi superbike.
