Avoid TRANS FAT.
Other than that read following:
It's really difficult to deal with doctors and NUTRITIONISTS who despite all the evidence still talk ADA NONSENSE. They won't discuss .. most will just scare with heart attacks. On this very forum in questions section there's a case where STATINS are givejn for Cholesterol level of 160. Ridiculous.
Dr Richard Bernstein joined medical school at age of 45 just because he was fed up of doctors of his time. He is a Type 1 diabetic himself. Google for Dr Bernstein and learn more from a diabetic.