Mango has a glycemic index (GI) of 51 to 56, placing it at the boundary between low and medium on the GI scale. A score below 55 is considered low GI, so most mango varieties land right in that range, making them one of the more blood sugar-friendly tropical fruits.
How Mango Ranks on the GI Scale
The glycemic index rates foods from 0 to 100 based on how quickly they raise blood sugar after eating. Pure glucose sits at 100, and anything below 55 is classified as low GI. Mango’s score of 51 to 56 puts it in similar territory to orange juice, but well below high-GI fruits like watermelon (which scores around 72 to 80).
For context, a low GI food causes a slower, more gradual rise in blood sugar rather than a sharp spike. This makes mango a reasonable fruit choice for people monitoring their blood sugar, including those with type 2 diabetes, as long as portions stay moderate.
Why Mango Scores Lower Than You’d Expect
Mango tastes intensely sweet, so many people assume it would spike blood sugar quickly. The sugar profile tells a more nuanced story. Per 100 grams, mango contains about 8.5 grams of sucrose, 3.4 grams of fructose, and just 1 gram of glucose. That matters because fructose is processed by the liver rather than entering the bloodstream directly, which slows down the overall blood sugar response.
Mango also contains about 1.6 grams of fiber per 100 grams and roughly 1.1 grams of starch. The fiber slows digestion, which delays sugar absorption. It’s not a high-fiber food by any standard, but it contributes enough to help blunt the glycemic response compared to drinking the same amount of sugar in liquid form.
How Ripeness Changes the GI
A green, unripe mango has more starch and less sugar than a fully ripe one. As a mango ripens, enzymes convert that starch into simple sugars, particularly sucrose and fructose. This means a very ripe, soft mango will raise blood sugar faster than a firmer, less ripe one. The published GI of 51 typically reflects ripe mango eaten fresh, so an overripe mango could push above that number, while a slightly underripe one may score a few points lower.
Dried mango is a different story entirely. The dehydration process concentrates sugars and removes water volume, making it far easier to consume large amounts of sugar in a short time. Dried mango can have a GI in the 60s or higher, and a typical snack portion packs significantly more carbohydrates than the same weight of fresh fruit.
Portion Size Matters More Than GI Alone
The glycemic index only tells you how fast a food raises blood sugar, not how much it raises it in a real-world serving. That’s where glycemic load (GL) comes in. GL accounts for the actual amount of carbohydrates in a typical portion. A cup of fresh mango (about 165 grams) contains roughly 22 to 25 grams of carbohydrates, giving it a glycemic load of around 8 to 12, which falls in the low to moderate range.
If you eat half a mango in one sitting, the blood sugar impact stays relatively modest. Eating two or three mangoes in a single meal is a different equation. The GI stays the same, but the total carbohydrate load multiplies, and so does the blood sugar response. For people with diabetes or prediabetes, keeping portions to about half a cup to one cup of fresh mango at a time is a practical guideline.
Comparing Mango to Other Fruits
- Apple: GI of about 36, lower than mango and one of the lowest among common fruits
- Banana (ripe): GI of about 51 to 62, similar to mango but climbs higher when very ripe
- Pineapple: GI of about 59 to 66, moderately higher than mango
- Watermelon: GI of about 72 to 80, significantly higher, though its glycemic load per serving is low due to high water content
- Grapes: GI of about 43 to 53, roughly in the same range as mango
Mango sits comfortably in the middle of the fruit spectrum. It’s not as gentle on blood sugar as berries or cherries, but it’s far from the sharp spike you’d get from watermelon or overripe bananas. Pairing mango with a source of protein or healthy fat, like yogurt or nuts, further slows sugar absorption and lowers the effective glycemic impact of the meal.