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Diabetes Remission, Reversal or Cure: Which Word Is Right?

Is type 2 diabetes reversible or curable? Dr. Sayantan Banerjee explains the official definition of remission, the A1C cut-off, and why the word you use changes your follow-up care.

TYPE 2 DIABETES REMISSION

Dr. Sayantan Banerjee

10/31/20268 min read

Search for "reverse diabetes" and you will find programmes, supplements, books and influencers, all promising a reversal. Your doctor, if you ask, will probably say remission. A few websites still use the word cure. The three words sound close, and many people use them interchangeably. But they lead to quite different decisions about your care, so it helps to know which one the science supports and why.

This article explains where each term comes from, what the official definition says, how to know whether you meet it, and what follow-up you still need if you do.

Why this question even exists

For most of the 20th century, type 2 diabetes was treated as a disease that only moved in one direction. The large UK Prospective Diabetes Study, which began in the 1970s, showed that people's beta cells, the cells in the pancreas that make insulin, tended to lose function year after year. Treatment was built around that expectation. You started with diet, then a tablet, then more tablets, and eventually insulin for many people.

That picture wasn't wrong. It described what happened when the underlying causes, mainly excess fat in the liver and pancreas, stayed the same. What changed over the past 15 years is that researchers began to test what happens when those causes are removed.

Bariatric surgery gave the first strong clue. Many people had normal blood sugar within days or weeks of a gastric bypass, long before they had lost much weight. Then diet trials at Newcastle University, and later the DiRECT trial, showed that substantial weight loss without surgery could do something similar in a large share of people.

Once that became clear, the medical world needed a word for it. That word was remission.

The official term: remission

In 2021, a joint panel from the American Diabetes Association, the European Association for the Study of Diabetes, the Endocrine Society and Diabetes UK published a consensus report in Diabetes Care. They chose the word remission on purpose, and they gave it a precise meaning.

Remission of type 2 diabetes means an HbA1c below 6.5%, or 48 mmol/mol, measured at least three months after stopping all glucose-lowering medication.

The definition applies whatever the cause. It might follow a diet, bariatric surgery, or another kind of intervention. The three-month wait counts from the day the last tablet or injection was stopped.

Three months is not an arbitrary number. HbA1c reflects the average glucose over the life of your red blood cells, which is roughly three months. A test taken sooner would still partly reflect the effect of the medicine you had been taking.

Why the panel avoided "cure" and "reversal"

The consensus report explained the choice clearly.

The word cure suggests the disease has gone permanently. The evidence doesn't support that. In the DiRECT trial, most people who were in remission at two years were no longer in remission at five years, mainly because their weight had crept back. A cure doesn't return.

The word reversal suggests that the process behind diabetes has been fully undone. But nobody can promise that someone's biology is exactly back to where it was before diagnosis. A person who has had diabetes still has the same genetic tendency, the same personal fat threshold, and beta cells that have spent years under pressure.

Remission, as the word is used in cancer care, means the disease is not active now and may or may not return. That fits what we see in type 2 diabetes.

The older categories: partial, complete and prolonged

You may come across an older definition from a 2009 ADA consensus statement. It used three levels:

Partial remission: blood glucose below the diabetes range, without medication, for at least one year.
Complete remission: fully normal values, such as an HbA1c under 6.0% and fasting glucose under 100 mg/dL (5.6 mmol/L), without medication for at least a year.
Prolonged remission: complete remission for at least five years.

The 2021 report replaced these with a single cut-off and a single rule, mainly so research studies could be compared directly. If an older clinic letter or study uses the earlier terms, they aren't wrong. They come from an earlier rulebook.

When HbA1c isn't reliable

HbA1c measures how much glucose has attached to the haemoglobin in your red blood cells. Anything that changes how long red cells survive can push the result up or down, regardless of your real glucose levels.

Common examples include iron deficiency, some forms of anaemia, recent blood loss or transfusion, chronic kidney disease, pregnancy, and inherited haemoglobin variants, which are more common in people of African, Mediterranean, Middle Eastern and South Asian heritage.

For people in whom HbA1c is unreliable, the 2021 report suggested other measures. A fasting plasma glucose below 126 mg/dL (7.0 mmol/L) can be used, or an estimated A1C, sometimes called a glucose management indicator, calculated from a continuous glucose monitor.

If your HbA1c result doesn't seem to match the readings on your home meter, ask your doctor whether one of these alternatives makes sense.

Why the word matters to you

Here is the practical point. If you believe you are cured, you are likely to stop the check-ups. And that is where the risk lies.

A person in remission still carries several of the same risks: a family history, a body that once passed its fat threshold, and beta cells that have been under strain. Blood glucose can drift up again, usually with weight regain, and it often does so without any symptoms.

There is also the question of damage that has already happened. Years of raised glucose before diagnosis, and sometimes after it, can leave early changes in the eyes, kidneys and nerves. These may continue to progress slowly even after glucose has returned to normal. Researchers sometimes call this the legacy effect or metabolic memory.

So the consensus panel recommended that people in remission:

have an HbA1c test at least once a year, and not more often than every three months
continue regular eye screening
continue foot checks
have kidney tests, including urine albumin and blood tests for kidney function
keep track of blood pressure and cholesterol

How it is recorded in the UK and the US

In the UK, ask your GP to record your status as "diabetes in remission" rather than removing the diagnosis altogether. This keeps you on the recall list for annual checks, including the NHS Diabetic Eye Screening Programme. If the diagnosis is removed, those invitations may stop.

In the US, the diagnosis usually stays on your chart with your primary care doctor. That matters for insurance, because it keeps eye exams, A1C tests and other monitoring covered. Ask how your clinic records remission, and make sure your follow-up visits stay booked.

In both countries, if you change doctors, tell the new practice about your history. A person in remission who is treated as never having had diabetes can miss important checks.

Is "reversal" ever fair?

In everyday conversation, many good clinicians say reverse, because patients understand it immediately. I don't think that is a serious problem in itself.

The problem starts when the word is used to sell something, with the hint that once you are "reversed" you can go back to old habits, or that a supplement or short plan has fixed the condition permanently. That is exactly the situation in which people lose remission without realising.

A more useful way to think about it is this. Remission is a state you keep, rather like fitness. You reach it mainly by losing weight and reducing fat in the liver and pancreas, and you hold it with the same habits that got you there.

Common myths about remission

Myth: If my A1C is normal on metformin, I am in remission. Not by the official definition. That is well-controlled diabetes, which is a good result in its own right.

Myth: Remission means I never had diabetes. It means your glucose is currently in the non-diabetic range without medicine. Your history still matters for your care.

Myth: Once in remission, I can eat anything. Weight regain is the most common reason remission ends.

Myth: Only people who are very overweight can reach remission. People with lower BMIs can also reach it, often with a smaller weight loss, because their personal fat threshold may be lower.

Myth: Remission is only possible with soups and shakes. Several routes can work, including lower-carb eating, intermittent fasting and bariatric surgery. What they share is sustained weight loss.

Quick reference

Remission — What it means: HbA1c under 6.5% (48 mmol/mol), at least 3 months after stopping all diabetes medicines; Who uses it: ADA, EASD, Endocrine Society, Diabetes UK, NHS
Reversal — What it means: Informal word for the same idea; Who uses it: Media, many clinics and programmes
Cure — What it means: Permanent end of the disease; Who uses it: Not supported by current evidence
Good control — What it means: Target HbA1c reached while taking medication; Who uses it: Routine diabetes reviews
Partial, complete, prolonged remission — What it means: Older 2009 categories; Who uses it: Some older studies and letters

What to ask your doctor

If you think you might be in remission, these questions help:

When did I stop my last diabetes medicine, and when is three months from that date?
Can we book an HbA1c test for after that date?
Is HbA1c reliable for me, or should we use fasting glucose or a glucose monitor?
How will my record show my status?
Which checks should continue each year?

What remission looks like day to day

People often imagine remission as a single moment, a letter from the clinic saying the diabetes has gone. In practice it feels more gradual.

In the first weeks of a serious weight-loss effort, fasting glucose readings often start to fall, sometimes quickly. That reflects fat leaving the liver. Medicines are reduced or stopped along the way, under supervision. Then comes the waiting period. You keep eating well, you keep moving, and you wait for the three-month HbA1c.

If the result is under 48 mmol/mol, you are in remission. If it is just above, say 49 or 50, you are very close, and a little more weight loss or a few more months often makes the difference. If it is clearly higher, you may need to restart a medicine. That isn't a failure. Your HbA1c is still likely to be lower than before, with fewer drugs.

After remission is confirmed, life becomes about maintenance. Most people who keep remission describe the same habits: weighing themselves regularly, keeping meals built around vegetables and protein, staying active most days, and acting quickly when weight starts to creep back. None of this is dramatic. That is partly why it works.

It also helps to remember that remission can be regained. Some people lose it after a stressful year, an injury or a pregnancy, and then reach it again once they return to their plan. The door doesn't close the first time glucose rises.

How my book can help

In The Type II Diabetes Remission Strategy I keep to the clinical definition throughout, so you always know what you are aiming for. The book includes a tracker journal where you can record when medicines were stopped, your three-month mark, your HbA1c results and your follow-up checks. More on the book page.

Frequently asked questions

Can you be in remission while taking metformin? Not by the 2021 definition. A normal HbA1c on metformin counts as well-controlled diabetes.

Does remission mean I can eat whatever I want? No. Weight regain is the most common reason remission ends.

Will my diagnosis be removed from my records? Usually not. In the UK it is normally coded as diabetes in remission, so annual checks continue.

How long does remission last? It varies. In DiRECT, about a quarter of people in remission at two years were still in remission at five years. Keeping weight off was the strongest factor.

Is diabetes reversal real? The improvement is real. The medical term for it is remission, because glucose can rise again.

What HbA1c counts as remission? Below 6.5%, or 48 mmol/mol, at least three months after stopping all glucose-lowering drugs.