Yes, some studies show that Acupuncture can help overcome Diabetes. Below is the picture indicating Acupoints for Diabetes. These points can be stimulated either by applying firm pressure - called Acupressure or by using hair-thin needles - called Acupuncture. Studies show that Acupuncture seems to have long-term and intense effects as against Acupressure.
The importance of Acupuncture in treating diabetes is already being answered on the forum. Please check the following link http://community.askgargi.com/577/is-it-true-that-acupuncture-can-help-control-diabetes
Image source - bhojraj.tripod.com