Diabetes occurs when either the pancreas does not produce enough insulin, or when the body can't effectively use the insulin it produces. (breastfeedingtoday-llli.org)
In type 2 diabetes, the beta cells at first produce enough insulin, but the body's cells are resistant to its action, so blood sugar remains high. (mediatrendings.com)
One is caused by a failure of the pancreas because of a congenital defect to produce enough insulin for metabolism. (breedingbusiness.com)