A fasting insulin level is not very useful, and doesn't really tell one much. It may be an indicator of insulin resistance, but it isn't the ideal test. The ideal test is a complex test done using an insulin and glucose infusions. The likely cause of a raised insulin is being overweight, and the clinical features of this are skin tags around the neck and upper body or acanthosis(darkness around the neck). Insulin resistance can be improved with weight loss, and is not a cause for weight gain
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