The best foods for blood sugar regulation

Blood sugar control is a key factor for people with pre-diabetes, diabetes, and anyone wanting to prevent metabolic diseases.

According to nutrition experts at the Harvard T.H. Chan School of Public Health, diet plays a decisive role in the ability to stabilize blood sugar, often having a greater impact than relying solely on medication.

Some foods can cause glucose spikes, while others help the body absorb it slowly, increase insulin sensitivity, and reduce inflammation – the foundation of metabolic health.

Below are 5 food groups evaluated by many prestigious studies as being most beneficial for those needing to control blood sugar.

1. Berries

Berries such as blueberries, strawberries, and raspberries contain abundant soluble fiber that helps slow down the absorption of carbohydrates and limits post-meal blood sugar spikes.

A synthesis of research from Harvard Medical School shows that anthocyanins – natural pigments in berries – can improve insulin sensitivity and reduce oxidative stress, thereby supporting better blood sugar control.

Additionally, a study published in the Journal of Nutrition noted that eating strawberries with a high-starch meal helped reduce post-meal glucose peaks compared to a control group.

Serving suggestion: eat 1/2-1 cup of berries daily, combined with unsweetened yogurt or whole-grain oats.

2. Nuts

Almonds, cashews, walnuts, and pistachios are all rich in unsaturated fats, plant-based proteins, and fiber – a trio that helps control blood sugar effectively.

According to the Cleveland Clinic, eating nuts before a meal can reduce the rate of glucose release into the blood and curb sweet cravings.

A small trial on people with type 2 diabetes showed that including almonds or peanuts in a low-carbohydrate diet helped reduce post-meal blood sugar and improved feelings of fullness.

Serving suggestion: 20-30g of nuts per day, prioritizing unsalted, un-sugared roasted nuts.

3. Seafood

Salmon, mackerel, sardines, and shellfish provide easily digestible protein and are rich in omega-3s, zinc, selenium, and vitamin D – factors linked to inflammation control and glucose metabolism.

According to Johns Hopkins Medicine, protein helps slow down digestion, reducing the rate of carbohydrate absorption and contributing to stable blood sugar levels. Specifically, fatty fish containing omega-3s can help reduce insulin resistance and improve blood lipids – important factors for people with pre-diabetes.

Serving suggestion: eat seafood 2-3 times per week, prioritizing steamed, pan-seared, or grilled options over deep-fried ones.

4. Beans and Lentils

Soybeans, black beans, chickpeas, lentils... are all rich in soluble fiber, resistant starch, and plant-based protein, helping to maintain sustainable blood sugar control.

According to the WHO, a diet high in fiber (especially from beans) can help reduce the risk of developing type 2 diabetes and improve glucose control in those already living with the condition.

Many studies also indicate that replacing a portion of refined starches in meals with beans can reduce post-meal blood sugar peaks and improve insulin sensitivity.

Serving suggestion: add beans to salads, soups, or eat them alternately as a starch source to replace white rice.

5. Kale - A "superfood"

Kale belongs to the group of vegetables rich in fiber, flavonoids, and antioxidants that help the body control blood sugar and reduce inflammation.

A study conducted in Japan on 42 adults showed that eating kale with a high-carbohydrate meal helped reduce the increase in glucose levels compared to the group that did not consume kale.

Experts at the Harvard School of Public Health also emphasize that dark leafy greens are the foundation of a good diet for pre-diabetics due to their high nutrient content and ability to support blood sugar stability.

Serving suggestion: blend into a green smoothie with apple and pineapple; mix into salads; or quick-sauté with olive oil.

Adding the above foods is only one part of a sustainable blood sugar control strategy. Experts recommend:

Prioritizing whole, minimally processed foods.

Limiting sugary drinks, sweets, and refined starches.

Maintaining 30 minutes of physical activity daily to increase insulin sensitivity.

Regularly checking blood sugar and developing a meal plan with a nutrition expert.

A balanced, healthy diet combined with correct food choices will help you effectively control blood sugar and reduce the risk of metabolic diseases in the long term.