‘Resetting’ a dysfunctional bowel by using fecal transplants is becoming accepted.
Risks of falling come from many sources, including blood pressure medications.
Whiplash is quite capable of causing stubborn problems even in low-speed shunts.
NIH guidelines on Vitamin D.
At ANY age, making sure you have enough muscle is very important.
If your feet and ankles stiffen up, the amount of information going to the brain (proprioception) drops dramatically.