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Can Prediabetes Be Reversed? What the Diabetes Prevention Program Found

Yes. In the US Diabetes Prevention Program, lifestyle change cut diabetes risk by 58%. Getting back to normal glucose even once lowered later risk by 56%. Here is how.

PREDIABETES REMISSION

Dr. Sayantan Banerjee

10/31/20268 min read

Yes, prediabetes can be reversed, and this is one of the strongest findings in all of diabetes research. The best evidence comes from a large trial funded by the NIH in the 1990s, whose participants are still being followed today, along with similar trials in Finland and China.

This article explains what those trials showed, why getting back to normal glucose matters more than simply slowing things down, what actually worked for participants, and how you can get the same kind of support in the US or the UK.

What "reversed" means here

In prediabetes research, reversal usually means returning to normal glucose regulation. In practice, that means an A1C below 5.7% (39 mmol/mol), a fasting glucose below 100 mg/dL (5.6 mmol/L), or a normal glucose tolerance test, depending on which measure is used.

This is slightly different from type 2 diabetes remission, which has its own definition. With prediabetes, there are usually no medicines to stop. The question is simply whether your glucose returns to the normal range, and stays there.

The Diabetes Prevention Program

The Diabetes Prevention Program, or DPP, enrolled 3,234 adults in the US with raised glucose but no diabetes. Their average age was 51 and their average BMI was 34. About two-thirds were women, and 45% came from minority groups, so the results apply to a broad range of people.

Participants were split into three groups: placebo, metformin 850 mg twice a day, or an intensive lifestyle programme.

The lifestyle goals were simple to state and hard to do. Lose at least 7% of body weight, and do at least 150 minutes a week of moderate activity, such as brisk walking. Participants had 16 one-to-one sessions with a lifestyle coach in the first 24 weeks, covering diet, exercise and behaviour change, followed by regular contact.

The results were published in the New England Journal of Medicine in 2002. After an average of 2.8 years:

Lifestyle change cut the risk of developing type 2 diabetes by 58% compared with placebo.
In people aged 60 and over, the reduction was 71%.
Metformin cut the risk by 31%.

The lifestyle programme beat the drug. The researchers estimated that about 7 people needed to go through the programme for three years to prevent one case of diabetes, compared with about 14 for metformin.

The same result in Finland and China

The Finnish Diabetes Prevention Study, published the same year, tested a similar lifestyle programme in middle-aged adults with overweight and impaired glucose tolerance. It also found a 58% reduction in the risk of diabetes.

In China, the Da Qing study ran a six-year lifestyle programme in the 1980s. Long-term follow-up found that people in the intervention groups developed diabetes several years later on average, and 30 years on, they had fewer heart problems and lower death rates than the control group.

Three trials, on three continents, in different populations, all found the same thing. Lifestyle change works.

Delay or reversal?

Some people point out that preventing diabetes for three years isn't the same as reversing prediabetes. That is a fair point. So researchers looked closely at what happened to the people whose glucose actually returned to normal.

In 2012, a follow-up analysis published in The Lancet looked at DPP participants who reached normal glucose regulation at least once during the trial. Over the following years, their risk of developing diabetes was 56% lower than for people who stayed in the prediabetes range. This was true regardless of which group they had been in, lifestyle, metformin or placebo.

That is the key point for you. Getting your numbers back into the normal range, even for a while, appears to change your long-term path. It is a real target, not just a nice extra.

The same analysis found something worth knowing. People who stayed in the prediabetes range despite the intensive lifestyle programme had a particularly high risk later on. The authors concluded that prediabetes is a high-risk state, especially for people who remain prediabetic despite lifestyle changes. For those people, closer follow-up, and sometimes medication, may be needed.

How long do the benefits last?

The DPP Outcomes Study continued to follow participants after the main trial ended. Over about 15 years, the lifestyle group still had a lower rate of diabetes than the placebo group, although the difference had narrowed to about 27%, as people aged and some weight returned. Metformin's benefit was around 18% over the same period.

The pattern is consistent. Lifestyle change works, its effect lasts for years, and it fades if the habits fade. That is a reason to plan for the long term, not a reason to give up.

What actually worked in the DPP

Weight loss was the strongest single driver. In the lifestyle group, each kilogram of weight lost was linked to a further fall in diabetes risk. People who reached the 7% goal did best.

Physical activity mattered too. People who met the activity goal of 150 minutes a week had a lower risk of diabetes, even if they didn't meet the weight-loss goal.

Diet changes focused on reducing fat and total calories, which was the standard approach at the time. Since then, research has shown that a range of eating patterns can work, including Mediterranean, lower-carbohydrate and plant-based diets, as long as they help people lose weight and improve food quality.

For a 90 kg (198 lb, or about 14 stone) person, 7% is about 6.3 kg (14 lb). That is a realistic amount for most people over six months.

The activity target of 150 minutes a week works out at 30 minutes on five days. Brisk walking was the most common choice.

Why it works: the biology

Prediabetes usually develops when the liver and muscles become resistant to insulin, often because of excess fat in the liver and around the organs. The pancreas compensates by producing more insulin. Over time, it struggles to keep up, and glucose starts to rise.

Weight loss reduces liver fat quickly, which makes the liver more responsive to insulin. Physical activity makes muscles take up glucose more readily, both during exercise and for hours afterwards. Together, these reduce the load on the pancreas.

At the prediabetes stage, the insulin-producing beta cells usually still have plenty of capacity. That is why change works so well here, and why acting early matters.

What about people who aren't overweight?

Some people develop prediabetes at a normal BMI. This is more common in people of South Asian and East Asian heritage, older adults, and people who are inactive or carry most of their weight around the middle. For these people, weight loss may still help if the waist is large, but activity, strength training, food quality and sleep become especially important.

How to get the same support

In the US, the CDC runs the National Diabetes Prevention Program, based directly on the DPP. CDC-recognised programmes run in person and online, through YMCAs, hospitals, community organisations and employers. Medicare covers a version called the Medicare Diabetes Prevention Program for eligible people, and many private insurers cover it too. The CDC says the programme can cut the risk of type 2 diabetes in half.

In England, the NHS Diabetes Prevention Programme, called Healthier You, offers a free course lasting at least nine months for people with non-diabetic hyperglycaemia, either in groups or digitally. Ask your GP to refer you, or check whether you can self-refer in your area. Scotland, Wales and Northern Ireland have their own services. Diabetes UK says combined lifestyle interventions can reduce the risk of type 2 diabetes by about 50%.

A realistic plan to reverse prediabetes

Know your numbers: A1C, fasting glucose, weight and waist.
Set a weight goal of 5% to 7% of your body weight if you have overweight.
Build up to 150 minutes a week of brisk walking or similar activity, and add strength exercise twice a week.
Cut sugary drinks, reduce refined carbs, and build meals around vegetables, protein and whole foods.
Sleep at least seven hours a night.
Join a structured programme if one is available.
Retest your A1C after three to six months, then at least once a year.

Common obstacles, and how people get past them

Knowing that prediabetes can be reversed is one thing. Doing it alongside work, family and everything else is another. These are the obstacles that come up most often.

"I don't have time to exercise." You don't need an hour at the gym. Ten minutes of walking after each main meal adds up to 30 minutes a day. Walking part of the commute, taking stairs, or a short walk at lunch all count.

"Healthy food is too expensive." Some of the most useful foods are cheap: oats, eggs, tinned beans and lentils, frozen vegetables, tinned tomatoes, bananas, potatoes and brown rice. Cutting sugary drinks and takeaways often saves money.

"I'm always hungry when I cut back." Hunger usually means meals are low in protein and fibre. Building each meal around vegetables and a portion of protein, and choosing whole grains and beans over refined carbohydrates, helps most people feel fuller on less.

"My family eats differently." Changes are easier when the whole household shares them. Many family favourites can be adapted, for example adding more vegetables and beans to a chilli or curry and serving smaller portions of rice.

"I've tried before and failed." Most people who succeed have tried before. Small, specific changes kept up for months work better than big changes for a few weeks. A structured programme with a coach or group can make a real difference.

"I feel fine, so it doesn't seem urgent." That is the trap of prediabetes. It is silent, but it is also the stage where change works best. Acting now is easier than managing diabetes later.

Myths about reversing prediabetes

Myth: You have to give up all carbohydrates. You don't. Cutting refined carbs and sugary drinks matters most. Whole grains, beans and fruit fit well in a prediabetes diet.

Myth: Supplements can reverse it. No supplement has matched the evidence for lifestyle change. Cinnamon, berberine, apple cider vinegar and similar products have weak or limited evidence, and some interact with medicines.

Myth: Only weight loss matters. Weight loss was the strongest driver in the DPP, but activity, sleep and food quality all help, including for people who don't need to lose weight.

Myth: Once reversed, it's gone for good. Glucose can rise again if weight returns or activity drops. Keep testing at least once a year.

How my book can help

The Prediabetes Exit Strategy takes these principles and adds what research has learned since, including food structure, meal timing, sleep and stress. It is designed to help you work towards normal glucose, not just slow the slide. More on the book page.

Frequently asked questions

How long does it take to reverse prediabetes? Many people see A1C move within three to six months. It depends on how much weight you lose and how active you become. I cover this in detail in a separate article.

How much weight do I need to lose? In the DPP the goal was 7% of body weight. Smaller amounts still lowered risk.

Can you reverse prediabetes without losing weight? Exercise alone helps, but weight loss had the biggest effect in the DPP.

Can prediabetes come back? Yes, especially if weight returns or activity drops. Yearly testing helps catch it early.

Is prediabetes reversible at any age? Yes. In the DPP, people aged 60 and over had the largest benefit from lifestyle change.

Do I need medication? Most people don't need it at first. Metformin may be considered for some higher-risk groups.

Is walking enough to reverse prediabetes? Walking helps a lot, especially after meals, but most people get the best results by combining it with diet changes and some weight loss.

What is the best diet to reverse prediabetes? There isn't one best diet. Mediterranean, lower-carb and plant-based patterns can all work if they cut refined carbs and sugary drinks and help with weight loss.

Does stress or sleep affect prediabetes? Yes. Short sleep and chronic stress both reduce insulin sensitivity and make weight loss harder.