Hi. Yes, the dietician gave you bad advice and you can get all the energy you need from small amounts of carb each day plus proteins and fat. I sometimes wonder why the NHS employs these idiots at our cost. Gliclazide stimulates the pancreas to produce more insulin and is of most use when the islet cells are failing usually due to antibodies (typically in T1) or very long-term T2. Metformin has no effect on the pancreas but reduces insulin resistance and reduces glucose around the body a bit. If you are not overweight and gliclazide doesn't work even at full dose (320mg) then the next step might be adding Sitagliptin for a while and then moving to insulin. If you have excess weight then Metformin might help plus the low-carb diet. In summary your BMI will be a very rough guide as to your diabetes type (and I mean rough!). Being thin implies T1 and being overweight implies T2. There are tests that can help.