Evid Based Complement Alternat Med. 2012;2012:163280.
Antidiabetic Effect of Morinda citrifolia (Noni) Fermented by Cheonggukjang in KK-A(y) Diabetic Mice.
Lee SY, Park SL, Hwang JT, Yi SH, Nam YD, Lim SI.

Diabetic mice fed fermented noni juice for 90 days had significantly lower blood glucose, glycosylated hemoglobin (HbA1c) levels, serum triglycerides and low-density lipoprotein (LDL) cholesterol, and food consumption than those in a reference group that did not consume noni.  Further, noni juice enhanced insulin sensitivity. (original abstract available at https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3434424/).