- There is no single prediabetes diet. The best eating pattern is one you can enjoy and keep up.
- Four principles matter most: more fiber, better carbs, enough protein and fewer sugary drinks and ultra-processed foods.
- Mediterranean, DASH, vegetarian and lower-carb approaches can all improve blood sugar.
- Start with a few easy swaps rather than a complete overhaul.
Food is one of the most powerful tools you have for prediabetes. What you eat affects your blood sugar within minutes, your weight over weeks, and your insulin sensitivity over months. The good news is that you do not need special “diabetic” foods, expensive supplements or a strict diet. Everyday whole foods, chosen a little more carefully, do the job.
Four simple principles
Vegetables, legumes, whole grains, fruit, nuts and seeds slow the release of sugar into the blood and keep you full. Aim for 25–30 g a day or more.
Swap refined grains and sugar for whole, minimally processed carbs, and keep portions moderate.
Protein helps you feel satisfied and reduces the blood sugar rise from the carbs you eat with it.
Sugary drinks raise blood sugar fast and do not fill you up. They are the single easiest thing to cut.
Why fiber matters so much
Reynolds et al., Lancet 2019; Aune et al., Eur J Epidemiol 2013. Most adults eat only about 15–20 g of fiber a day.
Eat more
- Non-starchy vegetables: leafy greens, broccoli, cauliflower, cabbage, okra, beans, peppers, tomatoes, cucumber, mushrooms.
- Legumes: lentils (dal), chickpeas, kidney beans, black beans, soybeans and edamame.
- Whole grains: oats, barley, brown or red rice, quinoa, millets such as jowar, bajra and ragi, whole-wheat bread and roti.
- Nuts and seeds: almonds, walnuts, peanuts, chia, flax and pumpkin seeds, a small handful a day.
- Healthy fats: olive, mustard or canola oil, avocado, and oily fish such as salmon, sardines or mackerel.
- Plain dairy or alternatives: unsweetened yogurt or curd, milk, paneer in moderate portions.
Eat sometimes, in moderate portions
- Starchy vegetables: potatoes, sweet potatoes, corn, peas. Keep to about a quarter of the plate.
- Whole fruit: 2 servings a day is great; berries, apples, oranges and guava are good choices. Pair tropical fruits like mango with nuts or yogurt.
- Lean meat and eggs: chicken, fish and eggs are fine as part of a balanced plate.
- White rice and white bread: smaller portions, mixed with vegetables or legumes.
Eat less
Soda, sweet tea, energy drinks and fruit juice. One to two a day raises diabetes risk by about a quarter.
Cakes, biscuits, sweets and sweetened cereals: save for occasional treats.
Chips, instant noodles and packaged snacks are easy to overeat and low in fiber.
Bacon, sausages, ham and deli meats are linked with higher diabetes and heart risk.
How you eat matters too
It is not only what is on the plate. Eating vegetables and protein first and the starchy part of the meal last can noticeably reduce the blood sugar rise after a meal. Regular meal times, not eating late at night and a short walk after eating all help as well. Portion size counts: using a smaller plate, serving vegetables first and putting the serving dish back in the kitchen make it easier to eat a little less without feeling deprived. Cooking at home more often gives you control over oil, salt and sugar, and it is usually cheaper too.
Choosing an approach that suits you
| Eating pattern | What it looks like | Good for |
|---|---|---|
| Mediterranean | Vegetables, legumes, whole grains, olive oil, nuts, fish; little red or processed meat | Blood sugar, heart health and long-term sustainability |
| DASH | Plenty of fruit, vegetables and low-fat dairy; less salt | People who also have high blood pressure |
| Vegetarian or plant-based | Legumes, whole grains, vegetables, nuts, dairy or soy | Fiber, weight and cholesterol |
| Lower-carb | Fewer starchy foods; more vegetables, protein and healthy fats | Quick improvements in blood sugar and weight for some people |
In the PREDIMED trial, a Mediterranean diet with extra olive oil lowered the risk of type 2 diabetes by about 40% even without weight loss. Pick the pattern that fits your culture, budget and tastes. The best diet is the one you can still follow in a year.
Easy swaps to start this week
MythPeople with prediabetes cannot eat fruit.
FactWhole fruit is linked with a lower risk of diabetes. It is fruit juice and dried fruit in large amounts that are best limited.
Common questions
Should I follow a keto diet?
Very low-carb diets can lower blood sugar quickly, but many people find them hard to sustain, and long-term evidence is limited. A moderate reduction in refined carbs works well for most people.
Is intermittent fasting helpful?
It can help some people eat less and lose weight. Results are similar to other ways of cutting calories. See the fasting section of our Prediabetes Complete Guide.
Are artificial sweeteners OK?
They are better than sugar-sweetened drinks as a stepping stone, but water and unsweetened drinks are the best long-term choice.
Already diagnosed with type 2 diabetes? Read Small Food Swaps That Help Lower Blood Sugar in our 18-part Type 2 Diabetes Basics series.
- Focus on fiber, better carbs, protein at each meal and water instead of sugary drinks.
- Eat more vegetables, legumes, whole grains and nuts; eat less sugar, processed snacks and processed meat.
- Mediterranean, DASH, plant-based and lower-carb patterns can all work.
- Start with two or three easy swaps.
- Next: 6 steps to improve prediabetes, starting this week.
Sources
- Reynolds A, Mann J, Cummings J, Winter N, Mete E, Te Morenga L. Carbohydrate quality and human health: a series of systematic reviews and meta-analyses. Lancet. 2019;393(10170):434–445.
- Aune D, Norat T, Romundstad P, Vatten LJ. Whole grain and refined grain consumption and the risk of type 2 diabetes: a systematic review and dose–response meta-analysis of cohort studies. Eur J Epidemiol. 2013;28(11):845–858.
- Salas-Salvadó J, Bulló M, Estruch R, et al. Prevention of diabetes with Mediterranean diets: a subgroup analysis of a randomized trial. Ann Intern Med. 2014;160(1):1–10.
- Malik VS, Popkin BM, Bray GA, Després JP, Willett WC, Hu FB. Sugar-sweetened beverages and risk of metabolic syndrome and type 2 diabetes: a meta-analysis. Diabetes Care. 2010;33(11):2477–2483.
- Shukla AP, Iliescu RG, Thomas CE, Aronne LJ. Food order has a significant impact on postprandial glucose and insulin levels. Diabetes Care. 2015;38(7):e98–e99.
- Evert AB, Dennison M, Gardner CD, et al. Nutrition therapy for adults with diabetes or prediabetes: a consensus report. Diabetes Care. 2019;42(5):731–754.
This article is for general education and is not a substitute for advice from your own doctor or healthcare team.