It's probably a back brace to correct late onset adult scoliosis, or curvature of the spine.
Which, in turn, is correlated with a lack of melatonin production.
TLDR:
> Backbrace
> Scoliosis
> Lack of melatonin
> Not eating enough "meat"
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC1855314/