Insulin Resistance and Prediabetes: What’s the Difference?
By Sara Estrin, MD, DABOM
Two terms that answer different questions
Insulin resistance and prediabetes often appear in the same conversation, which can make them sound interchangeable. They are related, but one describes how the body responds to a hormone and the other describes a blood-sugar range. Knowing the difference helps you understand what a test result is actually saying.
Insulin helps glucose move from blood into cells. With insulin resistance, cells respond less effectively. Prediabetes means glucose is above the normal range but below the diabetes range. Insulin resistance can be present before blood sugar becomes elevated. [1]
That distinction is a useful starting point for a conversation, rather than a reason to diagnose yourself from a symptom checklist. Ask which finding your clinician is describing and what information supports it.
Start with the result, then ask what it means
Insulin resistance and prediabetes often have no symptoms. Fatigue or cravings alone cannot diagnose them. Clinicians consider history, risk factors and appropriate blood tests; A1C and fasting glucose are common tests for prediabetes. A1C reflects average glucose over roughly three months, while fasting glucose reflects one point in time. Some conditions affect A1C accuracy. [1]
If you have results from different offices, put them together before your appointment. Note the dates and whether the same test was used each time. A short list is easier to discuss than trying to remember numbers during the visit.
You do not need to arrive with your own interpretation. A useful question is: “What does this result change about our plan?” That keeps the conversation focused on decisions.
Prevention is a plan you can repeat
Prediabetes does not mean diabetes is inevitable. Eating patterns, physical activity, sleep and weight management can contribute to prevention, and medication may be appropriate for some people. [1]
The Diabetes Prevention Program makes this more concrete. In this randomized trial of 3,234 high-risk adults, an intensive lifestyle program reduced diabetes incidence by 58% relative to placebo over about three years. Metformin reduced it by 31%. The lifestyle program targeted 7% weight loss and 150 minutes of weekly activity, with substantial coaching. [2]
Those are relative reductions—not a promise that 58 out of every 100 people will avoid diabetes. NIDDK reports annual diabetes development of about 5% in the lifestyle group versus 11% with placebo. The practical lesson is that structured support can matter; a single food or occasional workout is not the intervention that was tested. [2]
For your own plan, translate the discussion into something specific enough to put on a calendar: what you will try, how often, and when you will check in. A plan that only says “eat better” leaves too much to figure out afterward.
Leave with a next step, not a pile of rules
Bring three questions: Which result are we following? When should it be repeated? What is the most useful change for me to start with? If medication comes up, ask what benefit you are aiming for and how the decision fits your circumstances.
It can help to name the part you find difficult—planning meals, finding time, understanding the labs, or keeping a routine going. That gives the conversation a practical starting point. You do not have to solve every part of your health in one appointment.
Sources
NIDDK: Insulin Resistance & Prediabetes. Reviewed March 2025.
NIDDK: Diabetes Prevention Program. Initial trial results published 2002.
Sources checked October 5, 2026. Educational information, not an individual diagnosis or treatment plan.
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