For individuals grappling with prediabetes, often a silent precursor to type 2 diabetes, dietary adjustments are frequently recommended. Recent research from the Illinois Institute of Technology suggests that incorporating two specific fruits – avocados and mangoes – into the diet may offer significant benefits, improving both blood vessel function and blood pressure. This finding offers a potentially palatable and accessible approach to managing a condition affecting millions worldwide.
The study, published in February 2026, focused on 82 participants aged 25 to 60 who had been diagnosed with prediabetes (defined as fasting blood glucose levels between 100 and 125 mg/dL) and were either overweight or obese (with a Body Mass Index, or BMI, between 25 and 35 kg/m²). Participants were divided into two groups: an avocado-mango consumption group and a control group. Over an eight-week period, the avocado-mango group added one avocado and one cup of mango to their daily diet, consumed with meals and as snacks. The control group consumed a comparable number of calories through carbohydrate-based foods.
Researchers carefully excluded individuals who might skew the results. Participants were required to be non-smokers and not following any specific diet. Those with chronic diseases, vegetarian dietary habits, allergies to the study foods, recent significant weight fluctuations (more than 5kg in the past 60 days), a history of substance abuse, or those currently taking medications or supplements that could influence the study were excluded. Pregnant or breastfeeding women were also not included in the study.
The primary outcome measure was ‘flow-mediated dilation’ (FMD), a key indicator of blood vessel health. After eight weeks, the avocado-mango group showed a notable increase in FMD, rising from 5.9% to 6.7%. In contrast, the control group experienced a decrease in FMD to 4.6%. Higher FMD values are associated with a reduced risk of cardiovascular diseases like heart attack and stroke. Health Chosun reports that this suggests improved endothelial function, the inner lining of blood vessels.
The benefits weren’t limited to vascular health. Male participants in the avocado-mango group also experienced a reduction in diastolic blood pressure, averaging approximately 1.9 mmHg. Conversely, diastolic blood pressure increased by 5 mmHg in the control group’s male participants. The avocado-mango group demonstrated improvements in kidney function, as measured by glomerular filtration rate (eGFR).
The research team suggests that nutrient-rich fruits like avocados and mangoes can promote cardiovascular health without causing weight gain. Daum News highlights this finding, particularly in relation to the prevention of type 2 diabetes.
While the study focused on individuals with prediabetes, maintaining a healthy diet is crucial for everyone, including those already diagnosed with diabetes. The Korean Diabetes Association’s 2025 guidelines recommend that individuals with diabetes consume approximately 50-100 calories of fruit daily – equivalent to half to one apple, two medium-sized tangerines, or 5-10 strawberries. Prioritizing fruits with a lower glycemic index is also advised.
The association emphasizes the importance of dietary fiber found in fruits, which slows digestion and helps stabilize blood sugar levels. Consuming whole, fresh fruits is more effective in reducing diabetes risk than other forms. Studies have shown that individuals who consume fresh fruit at least twice daily have a 36% lower risk of developing diabetes, according to research from Edith Cowan University in Australia.
Fruits also contribute to preventing diabetes complications due to their high content of vitamins C and E, and flavonoids – powerful antioxidants that reduce oxidative stress and lower the risk of cardiovascular complications. A Japanese study found that individuals with diabetes who consumed the most fruits and vegetables had the lowest risk of diabetic retinopathy and stroke.
This research adds to a growing body of evidence supporting the role of dietary interventions in managing and preventing chronic diseases. While more research is needed to fully understand the mechanisms behind these benefits, incorporating avocados and mangoes into a balanced diet appears to be a promising strategy for those at risk of developing type 2 diabetes.
Researchers will continue to monitor the long-term effects of avocado and mango consumption on cardiovascular health and diabetes progression. Further studies are planned to investigate the optimal dosage and the specific compounds responsible for these observed benefits. For more information on managing prediabetes and diabetes, consult with a healthcare professional or refer to resources from the Korean Diabetes Association.
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