Priority food groups for effective blood sugar management
Type 2 diabetes is on the rise in Vietnam, linked to a sedentary lifestyle, overweight and obesity, and high intake of refined carbohydrates. According to recommendations from the World Health Organization (WHO) and the U.S. Centers for Disease Control and Prevention (CDC), proper nutrition is one of the most critical measures to help control blood sugar, improve insulin sensitivity, and reduce the risk of cardiovascular complications.
There is no single "superfood" that can reverse disease, but prioritizing foods rich in fiber, healthy fats, high-quality protein, and with a low glycemic index (GI) can help stabilize postprandial blood glucose, reduce HbA1c, and support weight management.
Below are 5 familiar, easily accessible food groups for Vietnamese people that have been recognized by numerous studies to benefit blood sugar control.
1. Dark leafy greens are great for blood sugar control
Green leafy vegetables such as spinach, kale, mustard greens, water spinach, and amaranth are low in carbohydrates but rich in fiber, magnesium, and antioxidants. The soluble fiber in these greens helps slow glucose absorption in the small intestine, thereby limiting sudden blood sugar spikes after meals. Magnesium is a mineral involved in the action mechanism of insulin; magnesium deficiency can decrease insulin sensitivity.
Some observational studies show that a high intake of green vegetables is associated with a lower risk of type 2 diabetes. For those who already have the condition, increasing vegetables in meals also promotes satiety and supports weight management—a key factor in improving blood sugar control.
Practical recommendations: Consume at least 300–400g of vegetables daily; prioritize boiling, steaming, or quick stir-frying with minimal oil; green vegetables can be prepared as soups, salads, or low-sugar smoothies.
2. Nuts and seeds provide healthy fats
Almonds, walnuts, chia seeds, flaxseeds, pumpkin seeds, etc., provide unsaturated fats, plant-based protein, and fiber. This combination helps slow carbohydrate absorption, prolong satiety, and curb snacking.
Omega-3 fatty acids in certain nuts and seeds have anti-inflammatory effects—while low-grade chronic inflammation is considered a mechanism linked to insulin resistance. Many small clinical trials show that adding nuts and seeds to the diet can slightly improve fasting blood glucose and certain lipid markers. However, nuts and seeds are energy-dense; consuming too much can increase total caloric intake and cause weight gain—which is detrimental to blood sugar control.
Practical recommendations: Consume about 20–30g of nuts/seeds per day, without added salt, sugar, or honey glaze; they can be sprinkled over salads, plain yogurt, or eaten as a snack.
3. Whole Grains to Replace Refined Carbohydrates
Refined starches such as white rice, white bread, and rice noodles often have a high glycemic index, easily causing postprandial blood glucose spikes. Replacing them with whole grains like brown rice, oats, quinoa, and millet provides more fiber, lowers the GI, and slows glucose absorption. Fiber also nourishes the gut microbiome, a factor widely studied in metabolic control.
Several meta-analyses indicate that individuals who consume more whole grains have a lower risk of developing type 2 diabetes compared to those with lower consumption. However, it must be emphasized that portion size remains a decisive factor. Even with "good" carbs, exceeding energy needs can still lead to increased blood sugar levels.
Practical recommendations: Replace 30–50% of white rice with brown rice or whole grains; divide meals into smaller portions and avoid eating too many carbohydrates at once; combine carbohydrates with vegetables and protein to slow down sugar absorption.
4. Fatty fish supports metabolism and cardiovascular health
Salmon, mackerel, sardines, and herring are abundant sources of omega-3 fatty acids. Omega-3s help reduce inflammation and benefit cardiovascular health—cardiovascular disease being the leading complication in people with diabetes.
Although omega-3 does not directly lower blood sugar, adding fatty fish 2–3 times a week helps improve blood lipid profiles, lower triglycerides, and support weight management when replacing protein sources high in saturated fat. High-quality protein in fish also promotes prolonged satiety, limiting overeating.
Practical recommendations: Eat fatty fish 2–3 times a week, prioritizing steaming, boiling, or baking over frying; pair with green vegetables and limit sugary sauces.
Nuts and seeds provide healthy fats that improve blood glucose and certain lipid markers.
5. Beans and lentils are fiber-rich plant protein sources
Lentils, red beans, mung beans, black beans, and other legumes are plant-based protein sources rich in soluble fiber and resistant starch. These components help slow glucose absorption and reduce postprandial glycemic response.
Several interventional studies show that increasing legume consumption can improve HbA1c and insulin sensitivity in people with type 2 diabetes. In addition, legumes have a lower glycemic index (GI) than many refined starches, promote prolonged satiety, and support weight loss when replacing a portion of starchy foods.
Practical recommendations: Replace part of the white rice in meals with beans or lentils; limit added sugar when cooking sweet bean soups; combine beans with vegetables and other protein sources for balanced nutrition.
Effective blood sugar management does not come from a single food, but from an overall dietary pattern rich in vegetables, whole grains, lean protein, and unsaturated fats; while limiting free sugars, sugary beverages, and ultra-processed foods. In addition, maintaining a healthy weight, engaging in at least 150 minutes of physical activity per week, and adhering to medical treatment as prescribed by a doctor are irreplaceable factors. Patients should monitor blood sugar regularly, attend follow-up appointments on time, and not arbitrarily discontinue medication when their numbers improve.