The best foods to help regulate blood sugar levels
Controlling blood sugar is crucial for individuals with prediabetes, diabetes, and anyone seeking to prevent metabolic diseases.
According to nutrition experts at the Harvard T.H. Chan School of Public Health, diet plays a decisive role in stabilizing blood sugar levels, having a much stronger impact than relying solely on medication.
Some foods can trigger sharp spikes in glucose, while others promote slower absorption, increase insulin sensitivity, and reduce inflammation—the foundation of metabolic health.
Below are 5 food groups rated by prestigious studies as the most beneficial for those who need to manage their blood sugar.
1. Berries
Berries such as blueberries, strawberries, and raspberries are rich in soluble fiber, which helps slow down carbohydrate absorption and minimize postprandial blood sugar spikes.
A review of studies by Harvard Medical School showed that anthocyanins—natural pigments found in berries—can improve insulin sensitivity and reduce oxidative stress, thereby supporting better blood sugar control.
In addition, a study published in the Journal of Nutrition found that consuming strawberries with a carbohydrate-rich meal helped reduce postprandial glucose spikes compared to the control group.
Usage suggestion: eat 1/2–1 cup of berries daily, combined with unsweetened yogurt or whole rolled oats.
2. Seeds and nuts
Almonds, cashews, walnuts, and pistachios are all rich in unsaturated fats, plant-based protein, and fiber—a trio that helps manage blood sugar effectively.
According to the Cleveland Clinic, eating nuts before meals can slow the release of glucose into the bloodstream and curb cravings for sweets.
A small trial in people with type 2 diabetes showed that consuming almonds or peanuts as part of a low-carbohydrate diet reduced postprandial blood glucose levels and improved satiety.
Usage suggestion: 20–30g of nuts per day, preferably unsalted, unseasoned dry-roasted nuts.
3. Seafood
Salmon, mackerel, sardines, and shellfish provide easily digestible protein while being rich in omega-3, zinc, selenium, and vitamin D—factors associated with inflammation control and glucose metabolism.
According to Johns Hopkins Medicine, protein helps slow down digestion, reduces the rate of carbohydrate absorption, and contributes to keeping blood sugar stable. In particular, fatty fish rich in omega-3s can help reduce insulin resistance and improve blood lipid profiles—crucial factors for people with prediabetes.
Usage suggestion: eat seafood 2–3 times a week, prioritizing steaming, searing, or grilling over deep-frying.
4. Beans and lentils
Soybeans, black beans, chickpeas, lentils, and other legumes are all rich in soluble fiber, resistant starch, and plant protein, helping maintain steady blood sugar control.
According to WHO, a diet rich in fiber (especially from beans and legumes) can help reduce the risk of type 2 diabetes and improve glucose control in people living with the disease.
Numerous studies also indicate that substituting beans for part of refined starches in meals can reduce post-meal blood sugar spikes and improve insulin sensitivity.
Usage suggestion: add beans to salads, soups, or incorporate them as a carbohydrate source to alternate with white rice.
5. Kale - a "superfood"
Kale belongs to the group of vegetables rich in fiber, flavonoids, and antioxidants, helping the body regulate blood sugar and reduce inflammation.
A study conducted in Japan on 42 adults showed that eating kale with a carbohydrate-rich meal helped reduce glucose spikes compared to the group that did not consume kale.
Experts from the Harvard School of Public Health also emphasize that dark green leafy vegetables are the cornerstone of a healthy diet for people with prediabetes due to their high nutritional content and ability to help stabilize blood sugar levels.
Usage suggestion: blend into green smoothies with apple and pineapple; toss in salads; or quickly stir-fry with olive oil.
Incorporating the above foods is only one part of a sustainable blood sugar management strategy. Experts recommend:
Prioritize whole, minimally processed foods.
Limit sugary drinks, sweets, and refined starches.
Maintain 30 minutes of physical activity daily to increase insulin sensitivity.
Monitor blood sugar regularly and develop a meal plan with a dietitian.
A balanced and healthy diet, combined with the right food choices, will help you manage blood sugar effectively and reduce the long-term risk of metabolic diseases.