On Dopamine, Levodopa, the Gut, and the Pancreas

Collecting references here - post more in the comments if you find them:

Minireview: Dopaminergic Regulation of Insulin Secretion from the Pancreatic Islet

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3725340/

Disruption of the Dopamine D2 Receptor Impairs Insulin mSecretion and Causes Glucose Intolerance

https://academic.oup.com/endo/article/151/4/1441/2456633

Effects of Plantago ovataHusk on Levodopa (with Carbidopa) Bioavailability in Rabbits with Autonomic Gastrointestinal Disorders

-serum levodopa increased ~%50 in rabbits fed the Plantago Ovata Hudk

http://dmd.aspetjournals.org/content/37/7/1434


Parkinson’s Disease - Link With Type 2 Diabetes

https://www.diabetes.co.uk/diabetes-complications/parkinsons-disease.html