I have often wondered what similarities we would find if various forums compared notes on their various conditions. I even talked with docjohn about it at one time and he was supportive. If there was a forum for something like that would you be interested? There are several overlaps that I know of and I'm sure there are others. Just hitting Medline with "celiac parkinson's" turned up some interesting bits:

1: Martin A, Romito G, Pepe I, De Vivo G, Merola MR, Limatola A, Gentile V.
Transglutaminase-catalyzed reactions responsible for the pathogenesis of celiac
disease and neurodegenerative diseases: from basic biochemistry to clinic.
Curr Med Chem. 2006;13(16):1895-902. Review.
PMID: 16842200 [PubMed - indexed for MEDLINE]

2: Ihara M, Makino F, Sawada H, Mezaki T, Mizutani K, Nakase H, Matsui M,
Tomimoto H, Shimohama S.
Gluten sensitivity in Japanese patients with adult-onset cerebellar ataxia.
Intern Med. 2006;45(3):135-40. Epub 2006 Mar 1.
PMID: 16508226 [PubMed - indexed for MEDLINE]

3: Ostrowski M, Izdebska M, Grzanka A, Zuryn A, Grzanka D.
[The involvement of transglutaminase 2 in autoimmunological diseases]
Postepy Hig Med Dosw (Online). 2005;59:334-9. Review. Polish.
PMID: 16012394 [PubMed - indexed for MEDLINE]

4: Pellecchia MT, Ambrosio G, Salvatore E, Vitale C, De Michele G, Barone P.
Possible gluten sensitivity in multiple system atrophy.
Neurology. 2002 Oct 8;59(7):1114-5. No abstract available.
PMID: 12370481 [PubMed - indexed for MEDLINE]

5: Kim SY, Jeitner TM, Steinert PM.
Transglutaminases in disease.
Neurochem Int. 2002 Jan;40(1):85-103. Review.
PMID: 11738475 [PubMed - indexed for MEDLINE]

6: Hadjivassiliou M, Gibson A, Davies-Jones GA, Lobo AJ, Stephenson TJ,
Milford-Ward A.
Does cryptic gluten sensitivity play a part in neurological illness?
Lancet. 1996 Feb 10;347(8998):369-71.
PMID: 8598704 [PubMed - indexed for MEDLINE]

7: Wakabayashi K, Takahashi H, Ohama E, Ikuta F.
Parkinson's disease: an immunohistochemical study of Lewy body-containing neurons
in the enteric nervous system.
Acta Neuropathol (Berl). 1990;79(6):581-3.
PMID: 1972853 [PubMed - indexed for MEDLINE]

8: Wakabayashi K.
[Parkinson's disease: the distribution of Lewy bodies in the peripheral autonomic
nervous system]
No To Shinkei. 1989 Oct;41(10):965-71. Japanese.
PMID: 2557873 [PubMed - indexed for MEDLINE]