Injecting insulin using 2 different insulins gives increased flexibility in terms of meal timings. There would be the need to inject a long acting insulin once daily, at a similar time each day, to provide constant 'background' cover for blood glucose levels.

To cover the spikes in blood glucose following a glucose containing meal, a rapid or fast acting insulin is administered before a meal. The timings of the meals can be varied, as long as the insulin is given just before in all cases. This method of delivering insulin is more akin to the normal physiological release of insulin in response to glucose from a meal.

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