The point here is about diet soda - ie, a drink that, as far as I know, does not contain sugar. I am seeking confirmation that diet soda is not harmful to diabetics. My mother receives insulin injections from the district nurse team who visit her daily. She has frequent blood tests, and the insulin dose has been varied to try to control her condition. I feel that we are under some criticism from the (medically unqualified) care home staff for bringing her diet Coke, and wanted confirmation that this should not effect her diabetes. Could you therefore please confirm that diet soda is not harmful to a diabetic.