Enlarge / These mice are about to have issues. (credit: Getty | Portland Press Herald ) In mice with either type I or type 2 diabetes, an intense, four-day fasting diet seemed to regenerate pancreas cells and restore insulin production. Researchers reported this finding on Thursday in Cell. In Petri dish experiments, human pancreas cells from patients with type 1 diabetes also showed altered gene expression and kick-started insulin production after being exposed to blood from people on a fasting diet. The results of the early work are promising for potential dietary treatments of both types of diabetes.