The most significant adverse effect of insulin therapy is hypoglycemia. This is especially the case for treatment of T1DM, but is also true for T2DM. Insulin allergy and lipoatrophy were commonly seen with the use of animal insulin before 'pure' and biosynthetic preparations became available. Both reactions are now rare, but can be seen, probably because there is some degradation during storage and/or with depot injection into tissues that can induce an immune response. Weight gain commonly occurs following improved glycemic control with insulin therapy. In the UKPDS, individuals receiving insulin therapy had an average weight gain of 4.0 kg over the course of the study.81
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All you need is a proper diet of fresh fruits and vegetables and get plenty of exercise and you'll be fine. Ever heard those words from your doctor? If that's all heshe recommends then you're missing out an important ingredient for health that he's not telling you. Fact is that you can adhere to the strictest diet, watch everything you eat and get the exercise of amarathon runner and still come down with diabetic complications. Diet, exercise and standard drug treatments simply aren't enough to help keep your diabetes under control.