Is diabetes mellitus 1 characterized as the inability of the pancreas to produce sufficient insulin?

A key issue, but No: Glucose control is complex & Insulin is only one of many controls involved, but insufficient ouput is basis for DX of type 1, <35 to 45 units/24 hrs, easily checked by checking c-peptide production. Insulin always secreted with amylin, available as symlin (pramlintide), (pramlintide) thus stopping all carbs & adding symlin (pramlintide) can markedly help. Other issues: body fat (binds insulin), muscle mass, adrenalin, gh, resistin, glp-1.