A study from the Illinois Institute of Technology found that adults with prediabetes who ate one avocado plus 1 cup of mango daily for eight weeks showed improved blood vessel function and reductions in diastolic blood pressure. Participants in the avocado-and-mango group had flow-mediated dilation (FMD) rise to 6.7%, while FMD fell to 4.6% in the control group, indicating better vascular function with the fruit combination. Men in the intervention group saw central diastolic blood pressure fall by about 1.9 mmHg, whereas men in the control group experienced an average increase of 5 mmHg.
The trial enrolled 82 participants, with 68 completing the protocol, and was funded in part by the National Mango Board and the Hass Avocado Board—details the authors noted when interpreting results.
Karen E. Todd, a registered dietitian nutritionist, said the findings are promising but not a magic bullet. She emphasized that the benefit likely reflects replacing lower-quality foods with nutrient-dense options. Mango adds vitamin C, potassium, and fiber, which support blood-vessel integrity, blood-pressure regulation, cholesterol, and blood-sugar control. Avocado contributes monounsaturated fats, fiber, and potassium that support cholesterol management and blood pressure. Together the foods complement each other nutritionally and may be more effective than either alone, particularly when they replace processed foods.
Cardiologist Brett A. Sealove noted the study warrants consideration but has limitations: a relatively small sample, short duration (8 weeks), partial control because participants prepared some of their own meals, and a diastolic blood-pressure benefit seen mainly in males, which limits generalizability.
Practical guidance: moderation matters. Avocados are calorie-dense and mangoes are higher in natural sugars, so typical portions might be one-third to one-half an avocado and half to 1 cup of mango several times weekly rather than daily for everyone. Whole-fruit sugars are less concerning in moderate portions because of accompanying fiber, but excess intake can add calories and undermine weight and metabolic goals.
Ways to include them: add mango and avocado to yogurt bowls with seeds, salads with leafy greens and legumes, as toppings for fish like salmon, blend them with spinach and a protein source for smoothies, or mash avocado on whole-grain toast and top with mango salsa. Experts stress that the greatest long-term heart benefits come from consistently building meals around whole, minimally processed foods and overall diet quality rather than single food fixes.