Prediabetes diet — an evidence-based guide.
If you have recently been told you have prediabetes, or your doctor is watching your blood sugar closely, you are probably feeling a mix of worry and confusion about what to eat. I want to start by reassuring you: a well-planned prediabetes diet is one of the most powerful tools you have, and for many people the numbers can improve meaningfully with steady, realistic changes. You do not need to overhaul your whole life overnight, and you certainly do not need to give up every food you love.
For deeper context, see: What to Eat Before, During, and After Your Workout (No Bro-Science, Promise).
As a dietitian, I spend a lot of my time helping people cut through the noise around blood sugar. There is a huge amount of fear-based and fad-driven information out there, and most of it makes people feel worse, not better. In this article I want to walk you through what prediabetes actually means, how food affects your blood sugar, and the practical, non-shaming changes that make the biggest difference. I will also share a sample day of meals and tackle some of the myths I hear most often in my clinic.
What Prediabetes and HbA1c Actually Mean
Prediabetes means your blood sugar is higher than the healthy range but not yet high enough to be called type 2 diabetes. It is often picked up through a blood test called HbA1c, which reflects your average blood sugar over the past two to three months, rather than a single moment in time.
- HbA1c gives your doctor a longer-term picture, which is why it is such a useful marker to track over time.
- Prediabetes is best understood as an early warning and an opportunity, not a verdict. It is a signal that your body is finding it harder to manage blood sugar, and that there is room to help it.
- For a great many people, the trajectory can be changed. Research consistently shows that changes to eating, movement and, where relevant, weight can lower HbA1c and reduce the risk of progressing to type 2 diabetes.
- If you already have type 2 diabetes, the same principles apply. Nutrition remains central, alongside any medication your doctor has prescribed.
The most important thing to hold onto is this: prediabetes is often improvable, and the steps that help are things you can genuinely live with.
Blood Sugar Balance: The Core Idea
Almost everything I teach around blood sugar comes back to one idea: balance. When we eat carbohydrate on its own, it tends to raise blood sugar quickly. When we pair it thoughtfully with fibre, protein and healthy fats, that rise is gentler and steadier, and you tend to feel fuller for longer.
- Aim to build meals around a combination of slow-release carbohydrate, protein and vegetables rather than carbohydrate alone.
- Avoid long gaps followed by very large meals. Regular, balanced meals help prevent the swings that leave you tired and craving quick sugar.
- Notice liquid sugar in particular. Sugary drinks, fruit juices and many flavoured coffees raise blood sugar fast because there is nothing to slow them down.
- Steadier blood sugar is not about perfection. It is about the overall shape of your day being balanced most of the time.
Carbohydrate Quality and Portion
I never ask my clients to fear carbohydrate. Carbohydrate is a normal, useful part of eating, and cutting it out entirely is rarely sustainable or necessary. What matters far more is the quality of the carbohydrate and the portion size.
- Choose higher-fibre, less-processed carbohydrates most of the time: wholegrain bread, oats, bulgur, brown or wild rice, wholewheat pasta, quinoa, beans, lentils and chickpeas.
- Enjoy whole fruit rather than juice. The fibre in whole fruit slows the sugar release, and fruit is a genuinely good choice within a balanced day.
- Be portion-aware with starchy foods. A helpful visual is around a fist-sized or cupped-hands portion of cooked starchy carbohydrate per meal, adjusted to your appetite and activity.
- Treat refined carbohydrates such as white bread, pastries, sweets and sugary cereals as occasional rather than everyday foods, without guilt when you do have them.
Fibre and Protein: Your Quiet Allies
Two nutrients do a lot of the heavy lifting in a prediabetes diet, and they rarely get the credit they deserve: fibre and protein.
- Fibre slows the absorption of sugar, supports gut health, and helps you feel satisfied. Aim to include vegetables, pulses, wholegrains, nuts and seeds across your day.
- Beans, lentils and chickpeas are especially valuable because they combine fibre and protein in one food, and they have a gentle effect on blood sugar.
- Protein helps blunt blood sugar rises and keeps you fuller between meals. Include a source at each meal: eggs, fish, poultry, lean meat, dairy, tofu, tempeh or pulses.
- Build fibre up gradually and drink plenty of water alongside it, so your digestion has time to adjust comfortably.
The Plate Method: A Simple Framework
If remembering grams and numbers feels overwhelming, the plate method is a calm, visual way to build balanced meals without weighing anything.
- Fill half your plate with non-starchy vegetables or salad: leafy greens, peppers, courgette, tomatoes, aubergine, cucumber, broccoli and so on.
- Fill one quarter with a protein source.
- Fill the remaining quarter with a higher-fibre starchy carbohydrate.
- Add a little healthy fat such as olive oil, nuts, seeds or avocado for flavour and satisfaction.
- This one framework works across Turkish, Mediterranean and international meals, which is why I lean on it so often with clients.
A Sample Day of Meals
Here is an example of what a balanced day might look like. This is an illustration, not a prescription. Your portions, timings and preferences should be personalised, ideally with a dietitian.
- Breakfast: Oats cooked with milk or a plant alternative, topped with a handful of berries, a spoon of yoghurt and a scattering of nuts or seeds. Or a Turkish-style breakfast with eggs, white cheese, olives, tomato, cucumber and one slice of wholegrain bread.
- Lunch: A large salad with plenty of vegetables, a portion of lentils or chickpeas, some grilled chicken or fish, and a drizzle of olive oil, with a small portion of bulgur or wholegrain bread.
- Snack (if needed): A piece of whole fruit with a few nuts, or plain yoghurt with cinnamon.
- Dinner: A vegetable-based stew or bean dish, a palm-sized portion of fish, chicken or tofu, a fist-sized portion of brown rice or bulgur, and a generous side of vegetables or salad.
- Drinks: Water, unsweetened tea or coffee across the day, keeping sugary drinks for rare occasions.
Weight, Movement and Alcohol
For some people, though not everyone, gentle weight loss can meaningfully improve blood sugar and HbA1c. If this is relevant for you, the aim is a gradual, sustainable change rather than a punishing crash diet.
- Even a modest reduction in weight, where appropriate, can improve how your body handles blood sugar.
- Movement matters in its own right. A short walk after meals is one of the simplest, most effective habits for steadier blood sugar, and it does not require a gym.
- Aim for a mix of daily movement and some strength or resistance activity across the week, at a level that suits your body.
- Alcohol affects blood sugar and adds calories with little nutritional value. If you drink, keep it modest, never on an empty stomach, and discuss it with your doctor if you take medication.
Common Myths About Prediabetes and Diabetes
There is a great deal of misinformation in this space, and it causes real anxiety. Let me clear up some of the myths I hear most often.
- Myth: You have to cut out all carbohydrate. Not true. It is the quality and portion of carbohydrate that matter most, and wholegrains, fruit and pulses can absolutely be part of your day.
- Myth: Sugar causes diabetes directly. The picture is more complex, involving genetics, weight, activity and overall dietary pattern, not one single food.
- Myth: If you take medication, food no longer matters. Nutrition remains central even alongside medication. The two work together, they are not alternatives.
- Myth: Special "diabetic" products are essential. Most are unnecessary and expensive. Ordinary whole foods, balanced sensibly, are far more useful.
- Myth: Prediabetes always becomes diabetes. It often does not. With the right changes, many people stabilise or improve their numbers.
Working With Hanzi Nutrition
Managing prediabetes or type 2 diabetes is not about willpower or perfection. It is about steady, personalised changes that fit your life, your culture and your food preferences, made with someone in your corner. I work with clients online, in English and Turkish, to build a realistic plan around their blood sugar, their routine and their goals, always in coordination with their doctor.
I will never ask you to change your diabetes medication, that is a decision for your GP or endocrinologist, and I actively encourage you to keep them involved. What I can do is help you understand your numbers, plan meals you genuinely enjoy, and feel calmer and more in control of your health.
If you are ready to steady your blood sugar with a plan that actually fits your life, book a consultation with Hanzi Nutrition today.
Hanzi Nutrition offers dietitian-led nutrition counselling across the Netherlands, Belgium, Germany, and Turkey, fully online, in English and Turkish. This article is general education and not a substitute for individual medical care. Please coordinate any changes to your nutrition, supplements, or treatment with your doctor.
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