Study investigates possible anti-diabetic effects of probiotics, on mice.

Yes, this study was performed on mice, but the findings were quite interesting.   You can read more about the aim, method, and results of the study here.  

“The anti-diabetic effect of 14 probiotics in db/db mice seem to be related to an increase of SCFA-producing bacteria, the improvement of intestinal barrier function and the upregulation of GLP-1 production, and indicate these probiotics might be a good candidate to prevent and treat diabetes.”