A UK study of nearly 57,000 people found that, even with high genetic risk, moving more and eating less ultra-processed food were linked to roughly half the risk of type 2 diabetes. It seems the activities that make the most difference are the ones that change what somebody's blood glucose does after they eat.
A study published on 5 October in the journal Diabetes followed 56,964 UK Biobank participants for almost eight years. Each person had a genetic risk score for type 2 diabetes. Among those with the highest genetic risk, people who moved more and ate less ultra-processed food had roughly half the risk of those with the least healthy habits.
The headline is encouraging, but the detail is more useful - even though this was just an observational study, not an experiment. When the researchers looked at which habits led to the healthiest outcome, two stood out: physical activity, which had the strongest link of anything measured, and ultra-processed drinks, the only food category still clearly linked to diabetes after full adjustment. Both have the same thing in common. They change how much your blood sugar rises after you eat or drink.
Type 2 diabetes starts long before the diagnosis
Type 2 diabetes is diagnosed on a single day, but it develops over years. The Whitehall II study, which followed 6,538 British civil servants, found that the metabolic changes behind it could be detected up to 13 years before diagnosis. Glucose levels, both fasting and after a sugary drink test, rose slowly for years and then climbed steeply in the final three years. Insulin sensitivity fell fastest in the last five.
That long run-up matters because routine tests are built to catch the end of it. An HbA1c or fasting glucose test gives one number, and that number can sit in the normal range while the body is working harder and harder to keep it there. What tends to change earlier is what happens after meals: how high glucose rises and how long it takes to come back down.
Genes and habits act on the same system
Most of the gene variants linked to type 2 diabetes affect how well the pancreas produces insulin or how well the body responds to it. In other words, genetic risk largely works through glucose control. You can't change your genes. You can change the daily load you put on that system, and the two habits in this study do exactly that.
Movement is the clearest example. Working muscles can take glucose out of the blood with much less insulin than resting muscles need. A 10-minute walk, started 20 to 30 minutes after a meal, reliably reduces the rise in glucose that follows. Over years, that means the pancreas does less work after every meal.
Drinks are the opposite case. Sugar in liquid form arrives with no fibre, fat or protein to slow it down, so it produces some of the fastest and sharpest rises in glucose of anything people consume. It also doesn't make you feel full, so it rarely replaces food. A daily flavoured coffee or energy drink adds a large glucose rise on top of everything else.
Why seeing it helps
The study is observational, and it didn't measure anyone's glucose, so it can't prove that blood sugar explains the result. What it does show is that the habits linked to lower risk are the same ones that most change glucose after meals.
The practical problem is that none of this can be felt. A glucose rise after a sweet drink feels like nothing at all, and the benefit of a walk is invisible on any single day. That makes these habits easy to drop.
A glucose sensor makes the effect visible. It can't diagnose anything; only a blood test can do that. What it can show is how your own body responds: which meals and drinks produce the biggest rises, and how much a walk afterwards flattens the line. When our members see the same lunch produce a sharp rise one day and a much flatter line the next because they walked afterwards, the habit stops being advice and becomes something they've measured. In our own data, flatter glucose lines (reduced glucose variability) tracked with weight loss.
See what Nico member Charles did about pre-diabetes:
If the changes behind type 2 diabetes start years before a diagnosis, the most useful time to pay attention to your blood sugar is during those years, while a family history is still only a risk.
Sources: Diabetes.co.uk report of the study published in Diabetes, 5 October 2026; Medical Economics summary of the Whitehall II findings.
Note: If you suspect you are pre-diabetic, you need to see a doctor. Glucose sensors or glucose test kits cannot give you this information. Speak to your doctor about your concerns.
Wear a sensor, log your breakfast, and your coach will tell you by lunchtime whether it worked.
This article is general information, not medical advice. If you're worried about your blood sugar, talk to your GP.
