Is a glucose meter useful if you don't have diabetes?
Without diabetes, a glucose monitor gives you some genuinely interesting information about how your body responds to food, exercise and stress. But that monitoring actually leads to better health has not yet been demonstrated.
A continuous glucose monitor, or CGM, measures your blood sugar around the clock via an adhesive sensor patch. A study of 153 healthy people aged 7 to 80 found that those values sit between 70 and 140 mg/dL 96% of the time, with an average of 98-99 mg/dL. People over 60 averaged 104 mg/dL. Useful as a reference point, but it says nothing yet about whether monitoring actually makes you healthier.
There are indications that CGM can detect early disturbances in blood sugar regulation. In a cohort of more than 7,000 people without diabetes, higher average values were associated with abnormalities on retinal photographs and a worse sleep pattern. These are observational associations: whether the higher blood sugar is the cause, or whether a shared underlying factor is at play, cannot be concluded from this.
Among endurance athletes, CGM is increasingly used to fine-tune nutrition around training. Scientific guidelines on how to interpret that data in athletes are still lacking. Notably, after one week of extremely intense training, healthy test subjects showed a measurable deterioration in their blood sugar regulation. Elite athletes showed demonstrably worse glucose regulation via CGM than a comparable control group. CGM therefore sometimes reveals unexpected patterns in athletes that would otherwise go unnoticed.
Researchers are also combining CGM data with AI. In a study of around 28,000 participants, an AI model trained on CGM and dietary data outperformed existing methods in predicting disease. Interesting, but this is still early-stage research and cannot simply be translated to your personal sensor.
The clinical benefit for healthy people has not yet been demonstrated in long-term, controlled research. How best to interpret CGM data outside a medical context, whether monitoring leads to better choices, and whether those choices ultimately produce health gains, remains unclear. In addition, a sensor can cause anxiety or unnecessary worry about normally fluctuating values.
All claims are based on observational studies and cohort research, not on randomised controlled studies with hard health outcomes in healthy people. The strength of the evidence is therefore limited to moderate.
Does it make sense to limit blood sugar spikes, even without diabetes?
Limiting blood sugar spikes makes sense even without diabetes: the risk of cardiovascular disease appears to rise with spikes that are still officially considered 'normal', and walking immediately after a meal is a simple, evidence-based way to reduce those spikes.
How do I know if my blood sugar is healthy (prediabetes)?
Prediabetes can be measured reliably, but no single blood test provides complete certainty on its own. If in doubt, have multiple values measured and discuss with your doctor whether a lifestyle programme or medication is worthwhile, because that difference has been proven to matter.
Does eating a lot of sugar give you type 2 diabetes?
Sugary drinks clearly and demonstrably raise your risk of type 2 diabetes. Sugar from solid food barely does. The biggest difference comes from drinking fewer sugary drinks, moving more, and losing weight.
How do you measure insulin resistance?
There is no single best method for everyone. For daily use, a fasting blood draw with HOMA or QUICKI (calculation methods for insulin resistance) is a reasonable starting point, as long as the result is compared with norms that fit your particular group.
Does a walk after eating help control your blood sugar?
A short walk after eating, or better still several short walking breaks of 2 to 3 minutes spread throughout the day, is a practical and well-supported way to limit blood sugar spikes, especially if you have excess weight or type 2 diabetes.
What does stable blood sugar do for healthy ageing?
A stable, low blood sugar is associated worldwide with more healthy life years. The association is clear, but the exact gain per individual cannot be quantified on the basis of this research.