Insulin resistance means your cells have stopped responding well to insulin, the hormone that moves sugar out of your blood and into your cells for energy. Your body compensates by making more insulin. For a while that works. When it stops working, blood sugar starts to rise.
She had been told her fasting number was "a little high" for three years running. Nobody had drawn the picture. She left each visit with a printout and a feeling that she had failed a test she had not studied for. I see you if that is you. You are not a person who missed a memo. You were handed a lab without a story.
Here is the thing I want you to hear first. This is physiology, not personal failure. You did not talk your cells into this.
I am Cheri Sacks, a registered nurse and a Certified Diabetes Care and Education Specialist. Insulin resistance is the term I explain most often, and almost nobody has had it explained plainly. This is education, not a diagnosis. I work with your physician, not instead of them.
The short version
Insulin knocks on the cell door. In insulin resistance, the cell stops listening, so the pancreas knocks harder. It is usually silent. Most people feel nothing. It is found through blood tests. It often sits on the path to prediabetes and type 2 diabetes.
Movement, sleep, and modest weight change can improve how cells listen. None of this replaces your care team. Talk with your physician before you change a medicine, a meal plan, or an activity plan that could drop your sugar.
NIDDK puts it simply: the body does not respond to insulin the way it should, and researchers do not fully understand what causes it (insulin resistance and prediabetes).
The picture I use
Insulin resistance explained in plain English means the cell stops opening the door, so your pancreas knocks harder.
Insulin knocks. The door opens. Sugar goes in to be used for energy.
In insulin resistance, the cell stops paying attention. So your pancreas knocks harder. It makes more insulin to open the same door. For a while the hallway looks fine. The knocking is happening in the background. Then the hallway starts to fill. That is when a fasting number or an A1C finally makes noise.
Muscle takes up most of the glucose after a meal, so muscle resistance shows up as higher after-meal numbers. Liver resistance shows up as higher fasting numbers, because the liver keeps releasing sugar overnight. That is why a "I didn't eat anything" morning can still look loud. The liver did not get the memo.
How it connects to prediabetes and type 2
Insulin resistance explained as the quiet stretch before prediabetes gives you time to ask your clinician what to watch.
For a while, extra insulin keeps blood sugar in range. Then it does not. That in-between stretch is often prediabetes. Then type 2, if the story continues.
CDC's National Diabetes Statistics Report, updated January 2026, estimates 115.2 million U.S. adults have prediabetes.
This is not a morality play about willpower. Age, family history, sleep, certain medicines, and where we carry weight all play a part. People in smaller bodies can have insulin resistance. People in larger bodies may not. Body size is one clue, not a verdict. If you want the earlier window spelled out, the prediabetes window most people miss is that piece.
What actually helps cells listen better
Insulin resistance explained through daily movement means a walk after meals helps your muscle take up glucose.
The Diabetes Prevention Program showed that a structured lifestyle program (about 7 percent weight loss and 150 minutes of activity a week) lowered new type 2 diabetes by 58 percent over about three years in people with prediabetes (NIDDK DPP). That is delay and less risk, not a cure, and it was a structured program with coaching, not a comment-thread cleanse.
In my chair, that looks like:
- Walking after meals, because working muscle takes up glucose even when insulin's knock is weak.
- A steadier plate.
- Sleep treated as part of the plan. See type 2 diabetes and sleep.
Metformin can be part of the picture for some people. That is a prescriber decision. See metformin and lifestyle. I do not start it.
I will not sell you a supplement protocol. The ADA's 2026 Standards do not treat herbal products as a substitute for standard care.
Insulin resistance explained as everyday care means a steadier plate, real sleep, and a next step you choose with your physician.
Family history is not a sentence. It is a reason to check. Sleep is not a luxury item on this list. Midlife can turn the volume up, which is why menopause and blood sugar sits next to this page for a lot of the women I see.
You do not have to wait for a dramatic A1C to take the knock seriously. A "little high" for three years running is already a story. Ask your physician what test they want next, and what would change in your care.
If you already have type 2, insulin resistance did not pack up and leave. It is still the mechanism under the diagnosis. That is why a walk after the meal still earns its keep, and why a medicine that helps the liver or the muscle is not a betrayal of "lifestyle." They are two tools for the same problem.
A moment from practice. A woman wanted a cleanse because "insulin resistance" had shown up in a comment thread and the cleanse promised to reopen the doors. We did not buy the cleanse. We named the knock. We kept breakfast. We added a ten-minute walk after lunch, which was the meal that always spiked her. Three months later her clinician still ordered the labs. She owned a picture she could live with. That is the work.
A final thought
Your cells are not misbehaving to spite you. They are adapting to a life, a family history, and a body that has been working hard. We can still help them listen.
I offer diabetes education and coaching, one-to-one, and group when that is a better fit. We can put a story on the printout. I still will not diagnose you or start metformin. The first conversation is a free call. You can book that here.
You do not need to do more. You need to do what works for your body.
With Care, Cheri Sacks, R.N., C.D.C.E.S. Your Neighbor, The Nurse
Education, not a diagnosis or a treatment plan. Please talk with your physician before you change a medicine, a meal plan, or an activity plan.
Related reading
- Prediabetes: the window most people miss
- Metformin and lifestyle
- Walking after meals
- The balanced plate
- Living well with type 2 diabetes
Frequently asked questions
Clinicians usually infer it from glucose tests, A1C, history, and sometimes other labs. Fancy insulin scores you bought online are not a DIY diagnosis. Ask your physician what would change in your care.
No. It is a mechanism that often comes first. Type 2 is diagnosed by glucose criteria. You can have resistance without a diabetes label yet.
No. And people in smaller bodies can have it. Body size is one clue, not a verdict.
Yes, for many people, with movement, sleep, medical care, and sometimes weight change. Improvement is not a cure promise.
Not from this article. Sudden carbohydrate cuts while on insulin or certain pills can cause lows. Talk with your physician.
