The short answer is yes. Research shows that more than half of adults over 65 have prediabetes, and that number climbs even higher once you hit 70. A large study published in JAMA Internal Medicine found that around 50% of American adults already have diabetes or prediabetes, and the rates among older adults are significantly higher than the general population. In Australia, Diabetes Australia estimates that roughly 2.5 million Australians have prediabetes right now, and most of them have no idea.
That last part matters. Prediabetes usually has zero symptoms. No pain, no warning signs, nothing that makes you think something is wrong. Your blood sugar quietly sits in a danger zone for years while your body keeps sending the same distress signal nobody reads.
So if you are over 70 and wondering whether this applies to you, it very likely does. But here is the thing. Knowing about it gives you a real chance to do something about it.
Why do older people get prediabetes?
Age itself changes how your body handles sugar, and the changes stack up fast after 65.
Here is what actually happens inside your body as you get older.
- Muscle mass drops. Muscle is your biggest user of blood sugar. When you move less or lose muscle over time, your body has fewer places to send the sugar you eat. It builds up in your blood instead. Research from the Journal of Clinical Endocrinology and Metabolism shows that muscle loss alone can raise blood sugar levels significantly, even without any change in what you eat.
- Your pancreas gets slower. The pancreas makes insulin, which is the hormone that moves sugar out of your blood and into your cells. As you age, the pancreas produces insulin more slowly and less efficiently. A 2019 study in Diabetes Care confirmed that beta cell function, which is the part of your pancreas that makes insulin, declines measurably after age 50.
- Cells become insulin resistant. Even when insulin is released, older cells do not respond to it as well. Think of insulin like a key and your cells like a door. Over time, the lock gets stiff. The key still fits, but the door barely opens. This is called insulin resistance, and it forces your pancreas to pump out even more insulin just to move the same amount of sugar.
- You move less. This is the big one. Physical activity is one of the most powerful tools for lowering blood sugar. When you walk, lift, or even just stand up regularly, your muscles soak up glucose without even needing insulin to do it. Less movement means more sugar sitting in your blood.
- Body fat shifts. Even people who weigh the same as they did at 40 often carry more fat around their abdomen by the time they hit 70. Abdominal fat is directly linked to insulin resistance. A 2020 review in Obesity Reviews found that visceral fat, which is the fat around your organs, actively interferes with insulin signalling.
What is a normal blood sugar for a 70 year old?
Normal blood sugar does not change based on your age. The target ranges are the same whether you are 30 or 80.
Here are the numbers you need to know.
- Fasting blood sugar (no food for 8 hours) should sit between 3.9 and 5.5 mmol/L. That is what is considered normal.
- Prediabetes range is 5.5 to 6.9 mmol/L fasting, or an HbA1c between 5.7% and 6.4%.
- Type 2 diabetes is diagnosed when fasting blood sugar hits 7.0 mmol/L or above, or HbA1c reaches 6.5% or higher.
The HbA1c test is the most useful one for older adults. It gives your average blood sugar over the past 2 to 3 months, so one bad meal or a stressful day does not throw off the result. Ask your GP for this test if you have not had one in the past year.
One thing worth knowing. Some doctors used to suggest that slightly higher blood sugar was acceptable in older adults. The current evidence does not support that view. A 2018 paper in The Lancet Diabetes and Endocrinology confirmed that blood sugar levels in the prediabetes range increase the risk of heart disease, cognitive decline, and kidney problems regardless of age. Normal is normal at any age.
Is everyone prediabetic now?
Not quite everyone, but the numbers are alarming. A major 2015 study published in JAMA using data from 2,781 adults found that 38% of American adults had prediabetes. More recent data suggests the number is now closer to 50% when you include undiagnosed cases. In Australia, the Australian Bureau of Statistics found that 1 in 3 adults has impaired fasting glucose, which is the pre-stage before a prediabetes diagnosis.
Why is it so widespread? Modern food is calorie-dense and low in fibre. Sitting is the default for work and leisure. Stress is high and sleep is short. All of these things push blood sugar up. Add in the fact that most people only get tested when they already have symptoms, and you end up with millions of people walking around with a problem they do not know they have.
But calling it an epidemic does not mean it is inevitable. Prediabetes is one of the most reversible conditions in medicine when you catch it early enough.
Can a 70 year old reverse prediabetes?
Yes. The research is clear on this.
The most important study on this topic is the Diabetes Prevention Program, a large clinical trial that ran for years across multiple sites in the United States. It found that lifestyle changes reduced the progression from prediabetes to type 2 diabetes by 58% overall. In adults over 60, the reduction was even better, reaching 71%. Older adults responded better to lifestyle changes than younger adults did.
That is not a small effect. That is more than two thirds of older adults stopping a serious disease in its tracks just by changing how they move and eat.
Here is what actually moved the needle in that study and in the research that followed.
1. Walking works better than most people think
You do not need to run, lift heavy, or suffer through intense cardio to lower blood sugar. Walking is one of the most researched and effective tools for reversing prediabetes. A 2022 meta-analysis in Sports Medicine found that walking after meals reduced blood sugar spikes by up to 30% compared to sitting. Even a 10 to 15 minute walk after eating makes a measurable difference.
Aiming for 7,000 to 10,000 steps a day is a solid target. If that feels like a lot right now, start with 3,000 extra steps daily and build from there. The consistency matters more than the total number.
2. Building muscle lowers blood sugar directly
Muscle tissue acts like a sponge for blood glucose. The more muscle you have, the more sugar your body absorbs with every meal. Resistance exercise, which means lifting weights, using resistance bands, or doing bodyweight exercises like squats and wall push-ups, increases how much glucose your muscles take up. A 2017 study in Diabetes Care found that resistance training alone reduced HbA1c by 0.38% on average, which is clinically meaningful for people in the prediabetes range.
Two sessions per week is enough to start seeing results.
3. Cutting refined carbs has an immediate effect
Not all carbs are the same. White bread, sugary drinks, white rice, and processed snacks spike blood sugar fast. Swapping them for high-fibre whole foods like oats, legumes, vegetables, and fruit slows the rise in blood sugar significantly. A 2020 study in Cell Metabolism found that people who switched from a processed food diet to a whole food diet excreted an extra 116 calories per day and had lower blood sugar, even when total calories stayed the same.
You do not need to go low-carb. You just need to choose carbs that come with fibre attached.
4. Losing even a small amount of weight helps a lot
You do not need to lose 20 kilos to see results. The Diabetes Prevention Program found that losing just 5 to 7% of body weight, which is about 4 to 6 kg for most people, reduced diabetes risk significantly. That is a realistic and achievable goal at any age.
The main driver here is reducing abdominal fat. Even when total weight on the scale does not change much, building muscle and reducing body fat around the midsection improves insulin sensitivity quickly.
What happens if you ignore prediabetes?
Around 5 to 10% of people with prediabetes progress to type 2 diabetes every year if they do nothing. Over 5 years, that adds up to roughly 25 to 50% of people with untreated prediabetes developing full diabetes. But that is not the only risk. Blood sugar in the prediabetes range already starts damaging blood vessels and nerves before diabetes is ever diagnosed.
A 2019 review in BMJ Open Diabetes Research and Care confirmed that prediabetes independently raises the risk of heart disease by 15%, stroke by 20%, and cognitive decline. Catching it now and doing something about it changes your long-term health trajectory in a real way.
Frequently asked questions
Should I see a doctor before starting exercise for prediabetes?
If you have been mostly sedentary, yes. Get a check-up and ask about your blood sugar, blood pressure, and heart health first. For most people, walking and light resistance training are very safe. Your doctor can confirm what is appropriate for your situation.
Can diet alone reverse prediabetes without exercise?
Diet alone can improve blood sugar, but the research consistently shows that combining diet and movement works better than either one on its own. The Diabetes Prevention Program specifically found that the combination was what produced the strongest results.
How long does it take to see results?
Most people see measurable improvements in fasting blood sugar and HbA1c within 3 months of consistent lifestyle changes. The Diabetes Prevention Program showed significant results within the first 6 months for most participants.
Does prediabetes feel like anything?
Usually no. Some people notice they feel more tired after meals, get thirsty more often, or have trouble losing weight. But most people have zero symptoms. A blood test is the only way to know for sure.
Is metformin used for prediabetes?
Sometimes. Doctors occasionally prescribe metformin for high-risk prediabetes cases, particularly for people under 60. But the Diabetes Prevention Program found that lifestyle changes outperformed metformin for adults over 60. Movement and diet are the first-line approach for older adults.
The bottom line
More than half of people over 70 have prediabetes, and most of them do not know it. It happens because of real biological changes that come with age, but those changes are not a life sentence. The research is clear that older adults can reverse prediabetes, and they actually respond better to lifestyle changes than younger people do.
Get your HbA1c tested. Start walking after meals. Add some resistance training twice a week. Swap a few processed foods for higher-fibre options. These are not small tweaks. They are the exact strategies that cut diabetes risk by 58 to 71% in clinical trials.
The data says most people your age have this problem. The data also says most people can fix it.
