Editor’s Note: This article was originally published in 2018 and is preserved for historical interest. Some recommendations, regulations, and scientific evidence have changed since it was written. It reflects the research and perspectives available at that time.

Research appearing in the Archives of Internal Medicine (2008 July 28;168(14):1493-9) shows that higher levels of serum vitamin C is associated with a lower incidence of type 2 diabetes. Subjects of the study were over 21,000 non-diabetic patients.