However, it is not enough simply to inject insulin at the booster rate for each of the main meals.
This needs an explanation.
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Before each main meal, someone who does not have diabetes, with a healthy metabolism, releases into the blood just enough insulin to keep the blood sugar within narrow limits (60 mg/dl - 110 mg/dl [3.3 mmol/l - 6.1 mmol/l]).
This is called the booster rate.
In addition, and quite independently of food intake, small amounts of insulin are continously and unceasingly released by the pancreas, throughout the day and night.
This is called the basal rate.
One simple way of considering this is by comparing the pancreas with a car. A car with its engine running gets away from the traffic lights much faster than a car which has to be started up every time the lights turn green. The pancreas works with its engine continuously ticking over so that if there is a sudden rise in blood sugar it can immediately release insulin.
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