Reason for nonworking of regular insulin in my body

I have been on various types of insulin since I was diagnosed with Type 1 diabetes close to 30 years ago. There are so many factors involved when dealing with diabetes, that there must be a good reason (s) for your doctor to make this switch. There are many decisions that I make on my own on a day to day basis when it comes to dealing with my diabetes, but when it comes to changing to a different type of insulin, I will only seek the advice of my doctor. He or she knows you best and if you have other problems that have to do with your diabetes this might come into play. My advice to you is ask you doctor your question again and don't leave the office until you feel satisfied that you get the answer you want.

Just as your body can build up an immunity to certain antibiotics and other drugs, insulins can lose their effectiveness.  There are different formulas and they all work in slightly different ways.  You should ask your doctor if there is an insulin similar to the Novorapid that is less expensive.  I am, however, confused by his choice.  The Mixtard is a combination of fast acting and slow release insulins, which cover you throughout the day.  He has changed you to three injections of fast acting insulin which won't cover you throughout the night.  Do you also take Lantus once a day and use the Novorapid at meals??  How have your morning blood sugars been since this change?  Do you wake up  with highs in the morning?  It has been my experience that unless you are on an insulin pump, which supplies your body with a stead stream of fast acting insulin, you need something long acting to keep your Blood sugars even between meals and during the night.  Let me know how you are doing and about whether or not you are taking Lantus as well.