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Message: <blockquote data-quote="catapillar" data-source="post: 1716183" data-attributes="member: 32394">Novorapid takes up to 20 minutes to start working after injecting, for some a bit longer. If you don't inject until after you've eaten you blood sugar will start rising before your insulin is even in, let alone working. And when your blood sugar is high your cells will be surrounded by glucose and it will take longer for the insulin to start working because it will have to battle it's way through the crowd of glucose surrounding the cells to get to the cell before it can start to work.While novorapid is marketed as a fast acting insulin, in reality it do isn't work instantly or even that fast. You are advised to inject before eating and many people pre bolus (ie then inject 20-30 minutes or more before eating) to combat post prandial spikes.Working out how pre-bolusing timing might work for you would be easiest done with a cgm or a libre because you can see when  your blood sugar starts curving down. Obviously if your going to experiment with pre bolusing you need to be cautious to avoid hypos, ie have something ready to eat and test every 5 minutes while you're working out the time it takes for novorapid to start working for you.Gary Schneier's article, strike the spike has good info on pre bolusing - <a href="https://www.diabetesselfmanagement.com/managing-diabetes/blood-glucose-management/strike-the-spike-ii/" target="_blank">https://www.diabetesselfmanagement.com/managing-diabetes/blood-glucose-management/strike-the-spike-ii/</a></blockquote>

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