The answer is osteoporosis -
osteoporosis is a disease where bones lose density and become more brittle and prone to breaking
Being underweight can contribute to a very frail and weakened immune system. It can make one feel tired mentally. And can also affect the bones by making them very brittle and frail sometimes.
A and C if it’s the thing I was doing
I would say all of the above, because all of those seem to be true
-hope it helps :3
