Having your appendix out as a child slashes the risk of developing Parkinson's disease by up to a quarter, according to new research. The tiny organ acts as a "major reservoir" for rogue brain proteins that trigger the illness, say scientists. It could even be where the neurological condition that causes devastating symptoms of shaking and slurred speech starts. The discovery could lead to a cure for the disorder that attacks the central nervous system. rates are increasing because of the ageing population.