Might this be an early effect of cortisol? The connection between high cortisol and lowered bone density is well known - as is the connection between a stressful environment and cortisol levels. Add in the stress from being the target of racism...
Just thinking aloud here.
Written by Bob Koure
Retired software architect, statistical analyst, hotel mgr, bike racer, distance swimmer. Photographer. Amateur historian. Avid reader. Home cook. Never-FBer