See links:
https://www.aofas.org/footcaremd/conditions/diabetic-foot/pages/charcot-joints-or-neuropathic-arthropathy.aspx
http://www.diabetes.org/living-with-diabetes/complications/gastroparesis.html?referrer=https://www.google.com/
https://nei.nih.gov/health/diabetic/retinopathy