High insulin levels are very common amongst people who are overweight. One of the best methods to address this, is with frequent exercising - a huge study was performed the DPP study, evaluating different groups of patients with glucose intolerance, and the group on life style changes did the best. Some medications are also insulin sensitisers and may help for insulin resistance, but I would definitely recommend an exercise program as part of your treatment.
I would recommend you contact a dietician to advise you on your diet - there are different ways of managing your diet and the best is to find out what works for you - one of the best diets, is a diet with low glycaemic index foods that will help to keep your blood glucose levels stable.
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