Too Much Ammonia?

Ammonia buildup from poor methylation resulting from MTHFR 1298c gene mutation?

Worth a shot.  Switching part of my laxative regimine to lactulose,  which lowers serum ammonia also.  Many articles suggest high ammonia levels correlate with PD, such as this one:

http://www.ncbi.nlm.nih.gov/m/pubmed/11240569/

May also explain part of why the eggplant juice has been working well, since it drives the urea/uric acid production, thus disposing ammonia.