Abstract
The prevalence of type 1 (T1DM) and type 2 diabetes mellitus (T2DM) in youth is on the rise. The increased incidence of obesity makes classifying diabetes difficult. At diagnosis, most young people present with characteristics of either T1DM or T2DM. Young people with double diabetes are obese, insulin resistant and have the immunological markers of T1DM. The appropriate markers must be used to identify double diabetes. Complications of double diabetes include abnormal lipids, polycystic ovary syndrome, hypertension, vitamin D inadequacy, and increased cardiovascular risk. Medical nutrition therapy is vital to the treatment and prevention of double diabetes and its complications.