9. Another disadvantage of consuming high concentration oxalic acid is that it could form dangerous oxalic acid crystals or gallstones in the body. A gallstone is a small, hard crystalline mass formed abnormally in the gallbladder or bile ducts from bile pigments, cholesterol, and calcium salts. Gallstones can cause severe pain and blockage of the bile duct.
Sources:
http://www.fao.org/docrep/t0207e/t0207e08.htm
http://www.ncbi.nlm.nih.gov/pubmed/2404325?dopt=AbstractPlus
https://en.wikipedia.org/wiki/Raffinose
https://en.wikipedia.org/wiki/Clostridial_necrotizing_enteritis
https://en.wikipedia.org/wiki/Trypsin_inhibitor
https://en.wikipedia.org/wiki/Starch
