Insulin resistance and prediabetes: what they are, and what lifestyle can do

Prediabetes sounds like a sentence. It is more of a warning light. It means your blood sugar is higher than normal, and it is not diabetes yet. And the main point: in a large share of people, lifestyle can turn it back. Here it is in plain language. What insulin resistance is, why it rises with age and with extra weight, and what actually helps. No scare tactics, and no miracles.

Insulin resistance and prediabetes, simply

When you eat, your blood sugar rises. The pancreas sends insulin, a hormone that works like a key: it unlocks cells so they can take sugar in as fuel. When everything works, sugar falls, and things are quiet.

Insulin resistance means the key turns poorly. Cells respond lazily to insulin, so the pancreas has to send more and more of it to keep sugar down. For a while, it manages. When it no longer can, blood sugar starts to creep up. That is where you enter prediabetes.

Prediabetes is the step between normal and type 2 diabetes: sugar higher than it should be, but still under the line for a diagnosis. A 2025 review article puts the chance that people with prediabetes progress to full diabetes at about 5 to 10% a year. That is exactly why it pays to deal with it before the line is crossed.

Why it rises with age and with weight

Two things work against you, and you can influence both.

Weight, especially fat around the belly. Excess fat, particularly the visceral fat around the organs and in the liver, worsens insulin sensitivity and keeps the body in a quiet inflammation. The liver then releases more sugar into the blood than it should. That is one of the main engines of the whole problem.

Age, and less muscle. Muscle is the biggest customer for sugar from the blood. As we get older and move less, muscle declines, activity drops, and insulin sensitivity drops with it. It is not that age itself is a disease. It is what happens to a body over the years when nothing is done about it.

The good news: you can actually influence both, the kilos and the muscle activity. That is what the data below shows.

Fat loss and a deficit: the strongest lever

If I have to pick the one thing with the biggest impact, it is losing excess fat. And it is not only about the number on the scale.

The large international PREVIEW study followed people with prediabetes and overweight for three years. Those whose prediabetes went into remission, and stayed there, had not only lost more weight and fat. They had a lasting improvement in how sensitive the liver was to insulin, and that held even independently of exactly how much they had lost (an analysis of PREVIEW data from 2026). At the same time, lasting remission was the exception in that study, not the rule. So it is not enough to drop a few kilos. You have to keep them off and let the body settle.

A 2025 review article says it from the other side: an intensive lifestyle change can cut the progression from prediabetes to diabetes by about 40 to 70%. That is a large number for something that does not require a prescription.

In practice: you do not need a starvation diet, and you do not need zero carbs. You need a modest calorie deficit you can keep, enough protein so you do not lose muscle while you lose fat, and a plan you can live with for months, not for two weeks. What that way of eating looks like is in what to eat to lose fat.

Movement: lifting, plus a walk after you eat

Movement works from two different directions, and combining them is best.

Strength training builds muscle, the tissue that takes the most sugar out of the blood. The more functional muscle you have, and the more regularly you use it, the better the body handles sugar. Two to three lifting sessions a week, where you gradually add load, is enough.

A walk after a meal is a quiet trick that works immediately. In a 2025 experiment, light walking instead of sitting lowered blood sugar after a meal, and a longer continuous walk also brought insulin down after the meal. You do not have to destroy yourself. This is ordinary easy walking, ideally shortly after you eat, when sugar spikes highest.

A practical recipe: the gym or body-weight training 2 to 3 times a week, plus 10 to 15 minutes of walking after main meals, and a decent daily step count. For a non-specialist, that is the best ratio of effort to result. A step target is covered in how many steps a day.

Food quality and sleep: the players people skip

Food does not have to be perfect to work. The base that works: enough protein, plenty of vegetables and fiber, mostly minimally processed food, and a sensible amount of carbohydrate around your movement. The goal is not to "ban" any food. It is to improve the overall pattern so it helps you hold the deficit and a steadier blood sugar. Sugar itself is not the villain the internet makes it. The dose and the pattern are, which is the point of the sugar myth.

Sleep is the thing almost everyone underestimates. A 2026 laboratory study showed that even a short stretch of restricted sleep worsened glucose handling in healthy young adults. And "catching up" on the weekend did not fully iron it out. The people who did best were the ones who slept enough every night.

So before you start chasing exotic supplements, fix sleep. A regular 7 to 9 hours does more for insulin sensitivity than most miracle pills.

What to do now, and where the line is

So this does not stay theoretical, here is the order by size of impact:

• Lose excess fat with a modest deficit you can keep. The biggest lever.
• Lift 2 to 3 times a week and add load. You are building the muscle that takes sugar up.
• Walk 10 to 15 minutes after meals, and keep an eye on daily steps.
• Straighten the food: protein, fiber, less industrially processed food.
• Sleep 7 to 9 hours regularly, not only on the weekend.

And now the important part, so it is clear. This is an educational piece about lifestyle, not medical advice. I am not diagnosing you, and I am not prescribing anything. Prediabetes and diabetes belong with a doctor. They measure your sugar and your HbA1c and tell you what is next. If you take any medication, do not change it and do not stop it on your own. Some drugs can also interact with training: one 2026 study, for example, suggested that metformin may blunt the vascular benefit of exercise in some people. All the more reason that medicines and training are your doctor's territory. Lifestyle and medical care are not opposites. They work best together.

Frequently asked questions

What is insulin resistance?

Cells respond lazily to insulin, so the pancreas has to send more and more of it to keep blood sugar down. When it can no longer keep up, sugar starts to creep up, and you move into prediabetes.

What is the risk that prediabetes becomes diabetes?

Prediabetes is the in-between step: sugar is higher than it should be, but still under the line for a diabetes diagnosis. A 2025 review article puts the chance that people with prediabetes progress to full diabetes at about 5 to 10% a year. Prediabetes belongs with a doctor, and if you take medication, do not change it or stop it on your own.

Why does insulin resistance rise with age and with weight?

Excess fat, especially visceral fat around the organs and in the liver, worsens insulin sensitivity. Muscle is the biggest customer for sugar from the blood, and as it declines with age and less movement, insulin sensitivity declines too. You can actually influence both, the kilos and the muscle activity.

What kind of exercise helps insulin resistance?

A combination works best. Strength training 2 to 3 times a week, with a gradual increase in load, builds the muscle that takes the most sugar from the blood. Add 10 to 15 minutes of walking after main meals. In a 2025 experiment, light walking instead of sitting lowered blood sugar after a meal.

Does sleep affect blood sugar?

A 2026 laboratory study showed that even a short stretch of restricted sleep worsened glucose handling in healthy young adults. Catching up on the weekend did not fully fix it. Set sleep at a regular 7 to 9 hours.

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• Is sugar bad for weight loss?

If you want a calorie number to start from, use the calorie calculator.

Sources, so you can check:

1) Zhu R, et al. (2026). Enduring improvements in hepatic insulin sensitivity predict sustained remission of prediabetes during a 3-year lifestyle intervention: results from the PREVIEW multinational diabetes prevention trial. Metabolism. DOI: 10.1016/j.metabol.2026.156546

2) Agrawal R. (2025). Prediabetes: To Be Treated or Not? Journal of the Association of Physicians of India. DOI: 10.59556/japi.73.1172

3) Wongpipit W, et al. (2025). Light Walking Patterns and Postprandial Cardiometabolic Responses in Young Obese Adults: A Randomized Crossover Study. Journal of Clinical Endocrinology and Metabolism. DOI: 10.1210/clinem/dgae789

4) Cheung Y.Y.Y., et al. (2026). Glucose homeostasis during recurrent periods of sleep restriction and recovery in healthy young adults. Sleep. DOI: 10.1093/sleep/zsaf339

5) Malin S.K., et al. (2026). Metformin Blunts Vascular Insulin Sensitivity After Exercise Training in Adults at Risk for Metabolic Syndrome. Journal of Clinical Endocrinology and Metabolism. DOI: 10.1210/clinem/dgaf551

6) Lim B.S.Y., et al. (2025). Metformin use in prediabetes: A review of evidence and a focus on metabolic features among peri-menopausal women. Diabetes, Obesity and Metabolism. DOI: 10.1111/dom.16442

Martin Barna

Online nutrition and fitness coach. Since 2013 I have helped 600+ people lose fat and keep the result. Science, not crash diets.

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This article is for information and education only. It is not medical advice and it is not a diagnosis. Talk to your doctor about prediabetes, diabetes, and any medication. Do not change or stop a medicine on your own.