Pancreas. If you have insulin deficiency or insulin resistance you will need proper care as prescribed by your doctor. No you cannot get improvement without drugs for diabetes! If you have type 2 diabetes you can carefully decrease your need for insulin drugs by careful food intake and exercise. That won't happen overnight but keep it up and you might no longer have diabetes.
Depends. Hi. Depends on your disease process. If you're type 1, by current technology, you're out of luck! Type 2 is tricky without drugs, but weight loss can lessen insulin resistance and make your insulin go further if not have more secreted (maybe both). But we have GREAT type 2 drugs. Don't be hesitant to use them...the eyes/feet/kidneys you save may be your own!