Aldose reductase inhibition

Aldose (or aldehyde) reductase is inhibited by several substances, including isoliquiritigenin (which I've been discussing in connection with licorice) and rutin (which interestingly is in tea - http://onlinelibrary.wiley.com/doi/10.1002/elan.200603496/abstract). Dietary sources of aldose reductase inhibition include spinach, cumin, fennel, lemon, basil, and black pepper. (https://www.ncbi.nlm.nih.gov/pubmed/19114390) Aldose reductase is most known for its role in glucose metabolism, but it has other functions including in norepinephrine metabolism (http://www.uniprot.org/uniprot/P15121).

Here are some studies indicating effects of inhibiting aldose reductase:

• Improves nerve conduction velocity in diabetic patients. (http://www.nejm.org/doi/full/10.1056/NEJM198301203080302)
• Helps prevent colon cancer in obese patients. (https://utmb.influuent.utsystem.edu/en/publications/aldose-reductase-inhibition-suppresses-azoxymethane-induced-colon)
• Significantly prevents goblet cell metaplasia in asthma and related pathologies. (http://journals.plos.org/plosone/article?id=10.1371/journal.pone.0014440)
• Negate diabetes-induced hypertension. (http://www.nrcresearchpress.com/doi/abs/10.1139/cjpp-2012-0232#.WArlMVQrIdU)
• Suppresses oxidative stress-induced inflammatory disorders. (https://www.ncbi.nlm.nih.gov/pubmed/21354119)

That last one is probably the most relevant to my quest to discover how to not get Parkinson's.