Well diabetes is a resistance to insulin... When we eat a lot of sugar our body dumps insulin which tries to lower our blood sugar levels by forcing the sugar into cells to be converted for use as an energy source. Over time our body can become less responsive to the insulin thus requiring larger doses. Considering people can develop an insulin resistance naturally. By injecting one's self with insulin (adding additional insulin) they could desensitize themselves too the amounts of insulin they produce naturally..

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