Is 4-6oz of Jicama root safe to eat every day?
According to the following website, Jicama root contains a fat-soluble organic toxin that is linked to the development of Parkinson's disease. It then seems to contradict itself a little by saying peeled roots are safe for human consumption.
I think their point is that peeled roots contain much less of the toxin, but given that the toxin is fat-soluble, it seems that build-up could occur if a person eats enough of it regularly. The question is: How much is too much?
Jicama plant contains significant levels of fat-soluble organic toxin, rotenone. This toxin is concentrated especially in the leaf tops, stems and seed pods but at much lower concentrations in the roots. Several studies found that it linked to the development of Parkinson's disease. However, peeled roots are safe for human consumption, including in children. Rotenone works at cellular level inhibiting several metabolic enzymes like NADH dehydrogenase in the mitochondria. Outside, it used as environmentally safe broad-spectrum insecticide, piscicide (to poison fish), and pesticide.