You have probably heard that mango is too sugary to eat often, especially if you have trouble with blood sugar. For many people with prediabetes, that worry means skipping the fruit altogether. The science has started to look more closely at that advice.
In a 24-week trial published in the journal Foods in August 2025, adults with prediabetes who ate about 300 grams of fresh mango every day saw their fasting blood sugar fall.
The control group, which ate a daily granola bar with the same number of calories, saw their fasting blood sugar rise instead.
The researchers also tracked HbA1c, a longer-term measure of blood sugar that reflects average levels over about three months. In the mango group, HbA1c stayed stable. In the control group, it drifted up.
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Insulin sensitivity, meaning how well the body's cells respond to insulin, held steady in the mango group. In the control group it declined over the 24 weeks.
What the trial actually tested
The trial, led by Raedeh Basiri, Assistant Professor of Nutrition at George Mason University, included 23 adults aged 50 to 70 with prediabetes. Half ate about 300 grams of fresh Tommy Atkins mango each day.
The other half ate a low-sugar granola bar with the same number of calories.
The mango serving carried about 32 grams of natural sugar. The granola bar carried 11 grams of added sugar. Despite the much higher sugar load, the mango group did better on nearly every measure the researchers tracked.
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Basiri pointed to the broader food context in her comments on the trial. "It is not just the sugar content that matters, but the overall food context that matters," she said.
A smaller change in body fat
The mango group also showed a modest drop in body fat percentage, from 30.5 percent to 29.1 percent. The effect was borderline in statistical terms. Fat-free mass, which covers muscle, water, and bone, moved up over the six months.
The waist-to-hip ratio dropped in the mango group but climbed in the control group. The authors describe body composition findings as suggestive and in need of confirmation in larger trials.
Why fiber and vitamin C matter here
A one-cup serving of fresh mango provides about 67 milligrams of vitamin C, which covers most of an adult's daily need. It also delivers around 3 grams of fiber.
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Fiber slows how quickly sugar from the fruit enters the bloodstream, which can blunt the rise in blood sugar after eating.
Mango has what nutritionists call a moderate glycemic index. That measure describes how fast a food raises blood sugar after a meal. A moderate score suggests a gentler rise than refined grains or sweetened snacks.
Honest limits of a small trial
The study was funded by the National Mango Board, a US fruit industry group. The authors reported no other conflicts of interest. Twenty-three completers is a small sample, and most participants were white and female.
The researchers set fasting blood sugar as the main outcome. Other measures, including body fat percentage and insulin sensitivity, were listed as exploratory and will need to be confirmed in larger studies.
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Anyone already diagnosed with type 2 diabetes should talk to their doctor before adding daily mango to a routine. The blood sugar response to any sweet fruit depends on medication, meal timing, and portion size.
In the trial, the daily portion was about 300 grams of fresh fruit, which is roughly one medium mango or close to two cups of diced flesh.
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This article is made and published by Jesper Bengtson, who may have used AI in the preparation.