This myth probably arose because insulin is often given in situations where atherosclerosis (narrowing of the arteries) is already present but not clinically evident. Atherosclerosis takes years to develop, so a medication like insulin that has been started in the last few months is hardly to blame. Want an example? When young men killed in combat during the Korean War were carefully examined, they already had evidence of early atherosclerosis that probably wouldn't have been clinically evident for decades.
The fact is that insulin actually causes a decline in atherosclerosis by reversing the processes that lead to elevated blood glucose levels and elevated fatty acids in the blood.
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