Diabetes is a complex health condition that affects how your body regulates blood glucose. You are encouraged to monitor your blood glucose levels, eat a balanced diet, stay active, take prescribed medications, and attend regular check-ups. These steps are important, but even when you follow them closely, diabetes doesn’t always cooperate. Pharmacist and Credentialled Diabetes Educator, Donna Itzstein, offers advice on how to manage the unpredictability of diabetes.

Doctors and diabetes educators provide plenty of evidence-based advice to help you manage diabetes, from checking your blood glucose regularly and counting carbohydrates to staying active, taking medications as prescribed, and attending regular health checks. These strategies play an important role in supporting stable blood glucose levels.

Yet even when you do everything “right”, blood glucose levels can still be unpredictable. Every body responds differently, and a wide range of factors, both obvious and unseen, can influence your readings. As a result, blood glucose levels can vary from day to day, even when your routine stays exactly the same.

Why blood glucose can be so unpredictable

It’s not uncommon to feel confused or frustrated when your blood glucose levels fluctuate without a clear reason. You might eat a nutritious breakfast, do some physical activity, take your medications, and still get a reading that doesn’t make sense. Stress, excitement, hormones, weather changes, hydration levels, poor sleep, or even hidden carbohydrates in food can all play a role.

People living with diabetes sometimes call these “rogue numbers” because the readings don’t make sense. You could eat the same lunch every day, yet one day your blood glucose might high or drop unexpectedly low the next. It’s just how diabetes works sometimes.

No routine is perfect

Books, websites, and even well-meaning advice can make it sound like managing diabetes is a simple formula: count carbs, take medication, monitor your levels, and you’ll be fine. But real life is more complicated.

Take the “dawn phenomenon” for example, your blood glucose may rise in the early morning hours even if you didn’t eat before bed. Or consider how exercise, which is usually helpful, can sometimes cause your blood glucose to rise due to the release of stress hormones like adrenaline and cortisol. Even emotions of joy, fear, and frustration can affect your blood glucose levels.

Trying to follow a perfect routine can feel exhausting, especially when it doesn’t always work. And that is frustrating.

How this can affect your feelings

When you’ve done everything right but your blood glucose is still out of range, it’s easy to feel disheartened. You might blame yourself or feel like you’ve failed. But you haven’t. Diabetes is difficult to control, and that’s why we talk about “management” rather than “control”.

Living with diabetes is often emotionally draining. It can cause fatigue, anxiety, and even isolation due to its unpredictability, especially when others don’t fully understand what you’re going through. But you’re not alone, and your efforts matter.

Learning to adapt

So what can you do when diabetes doesn’t follow the rules? The key is flexibility. Do not expect everything to be perfect. Learn to adapt your plans, forgive yourself when things don’t go as expected, and celebrate the small wins.

Tools such as continuous glucose monitors, insulin pumps, and mobile apps can help you track patterns and respond more quickly. These technologies make life easier, but they can’t make diabetes completely predictable.

It is more important to focus on what happens most of the time than to worry about every single number. Be kind to yourself, ask for support when you need it, and remember that managing diabetes takes strength and flexibility.

Science and hope

Researchers around the world are working hard to better understand diabetes and develop more effective treatments. New medications, smarter devices, and deeper insights into how diabetes works are emerging all the time.

Each discovery brings hope and while diabetes may remain unpredictable, the future holds promise. People living with diabetes are among the most resilient and resourceful individuals, and science is on your side.

Stories from real people

If you’re feeling overwhelmed, consider joining a peer support group. If you are a member of Diabetes Australia you are already part of Australia’s largest diabetes community and can access our community forum, Diabetes Connect, at any time. Talk to other people living with diabetes, ask questions, share tips (and frustrations), and meet with health professionals. The community offers connection, understanding, and practical advice. People share tips, celebrate good days, and help each other through tough ones. Most importantly, members remind each other that one difficult day, or one unexpected blood glucose reading, doesn’t erase all the effort you’ve put in.

What success really means

Success is about doing your best every day, being prepared to adjust, and not giving up no matter what diabetes throws your way. Some days you just have to stand back, acknowledge you’ve done the best you can, and agree to start afresh tomorrow. But there will be days when diabetes gives you a break and everything goes to plan. Celebrate these days when they come.

Living with diabetes isn’t about perfection, it’s about persistence. Learn to be flexible, be kind to yourself, lean on others for support when you need it, and remember the one predictable thing about diabetes is its unpredictability.