Cantaloupe Glycemic Index
Medium GI · The honest verdict
A moderate blood-sugar rise
Glycemic index
65–70
reported range
Glycemic load
5
Low GL
This food's glycemic index is 65–70, which is Medium GI.
Cantaloupe is the classic GI-vs-GL lesson: its GI looks concerning (65–70, medium-high), but because the fruit is 90% water, a standard cup serving contains only about 12 g of available carbs — yielding a low glycemic load of roughly 5. One cup is generally manageable for blood sugar; large portions amplify the impact. This is general nutrition information, not medical advice; people with diabetes should discuss cantaloupe portions with their care team.
GI numbers vary by source, ripeness, and how a food is prepared. This is general nutrition information — not medical advice. If you manage diabetes, confirm specifics with your care team.
Key facts
Cantaloupe is about 90% water by weight — this is why a one-cup serving has a low glycemic load (GL ~5) despite a medium-high GI of 65–70.
One cup of diced cantaloupe supplies about 58 mg of vitamin C (65% of the daily value) and exceptional amounts of vitamin A from beta-carotene.
Glycemic load — not GI alone — is the more practical measure for real-world blood sugar impact because it accounts for realistic portion sizes.
What's actually inside
Per 100 g, with your typical serving noted as 1 cup diced (160 g), raw. The carb family is what moves blood sugar — fiber is the number that softens the spike.
Total carbs
13g
Net carbs
11.8g
total carbs minus fiber
Fiber
1.4g
slows the glucose rise
- Sugars
- 12.6g
- Protein
- 1.3g
- Calories
- 54kcal
Notable nutrients
- Vitamin A (beta-carotene)2706 mcg RAE
- Vitamin C58 mg
- Potassium427 mg
- Folate37 mcg
- Vitamin B60.11 mg
Is it a smart choice for blood sugar?
GI is only half the story — portion (glycemic load) and what you eat it with decide the real-world effect. Here's the honest read.
The verdict
Generally manageable in one-cup portions despite the medium-high GI
Cantaloupe is the classic GI-vs-GL lesson: its GI looks concerning (65–70, medium-high), but because the fruit is 90% water, a standard cup serving contains only about 12 g of available carbs — yielding a low glycemic load of roughly 5. One cup is generally manageable for blood sugar; large portions amplify the impact. This is general nutrition information, not medical advice; people with diabetes should discuss cantaloupe portions with their care team.
Portion guidance
One cup of diced cantaloupe (about 160 g) is the key portion boundary — this keeps GL low (around 5). Two cups raises GL to around 10, still technically low but at the upper edge. Three or more cups begins to push into medium-GL territory, especially for people who are managing carbs carefully. Eat cantaloupe as part of a mixed meal rather than alone to blunt the glucose response.
This is general nutrition information, not personal medical advice. Blood sugar responses are individual — if you have diabetes or prediabetes, your care team can tell you how this fits your plan.
How to keep the spike small
The same food can land differently depending on how it's cooked and what it's eaten with. Use these levers to your advantage.
Eating chilled vs. room temperature
Little effectTemperature does not meaningfully change the GI or sugar content of cantaloupe. Chilling is a preference, not a blood sugar strategy.
Blending or juicing
Raises GIBlending cantaloupe into a smoothie or juicing it removes fiber and makes the sugar more rapidly available, raising the effective glycemic response compared to eating the cubed fruit.
Pairing with protein or fat
Lowers the spikeWrapping cantaloupe in prosciutto, serving alongside cottage cheese, or pairing with nuts introduces protein and fat that slow gastric emptying — counteracting cantaloupe's moderately fast sugar release.
Larger portions
Raises GIBecause cantaloupe's high GI is only offset by its water dilution at normal serving sizes, eating a large amount shifts the calculus — a half melon can contain 40+ g of carbs, enough to meaningfully raise GL.
Pairing tip
The classic pairing — cantaloupe with prosciutto — is also one of the best for blood sugar management. The salt and fat of cured meat slow absorption and complement the sweetness. Alternatively, serve diced cantaloupe with plain Greek yogurt and a few mint leaves. Avoid fruit salads that add additional high-sugar fruits on top of cantaloupe in large quantities.
Why GI numbers vary
Cantaloupe GI values in published databases range from about 65 to 70 depending on ripeness, variety, and the study. Harvard's GI table lists cantaloupe at 65; other references put it closer to 70 for very ripe melon. The glycemic load calculation is more stable: at a realistic one-cup (160 g) serving with roughly 13 g of carbs, GL = GI × 13 ÷ 100, which yields about 8–9 regardless of whether GI is 65 or 70. The takeaway is the same either way: a standard portion has a low glycemic load despite a medium-high GI.
Not medical advice. This page is general nutrition information about Cantaloupe. It isn't a diagnosis or a treatment plan. If you have diabetes, prediabetes, or another condition affecting blood sugar, confirm any dietary decisions with your doctor or care team.
❓Frequently Asked Questions
Cantaloupe has a medium-to-high glycemic index — roughly 65–70, which puts it right at or just above the medium-GI threshold of 56. However, GI alone can be misleading for cantaloupe. Because the fruit is 90% water, a typical one-cup serving contains only about 12–13 g of available carbohydrates, which gives it a glycemic load of only about 5 — firmly in the low range. This GI-vs-GL gap makes cantaloupe one of the most instructive foods for understanding why glycemic load matters.
Generally yes, in moderate portions. Despite its medium-high GI, a standard one-cup serving of cantaloupe has a low glycemic load and provides excellent vitamin A, vitamin C, and potassium. The key is portion control — eating a quarter of a large melon or more can stack up to 40+ g of carbs. People with diabetes should factor cantaloupe's roughly 13 g of carbs per cup into their carb count and check their individual response, ideally confirming portions with their care team.
This is the classic GI-vs-GL teaching case. Cantaloupe's GI measures how fast its carbs raise blood sugar relative to glucose — and the answer is 'fairly fast' (65–70). But GI is measured on a fixed amount of carbohydrate (50 g), not a realistic serving. When you eat a cup of cantaloupe, you only get about 12 g of carbs because the rest of the fruit is water. Glycemic load adjusts for this: GL = GI × carbs in serving ÷ 100. At 65 × 12 ÷ 100, GL is about 8 — low. The water content is doing most of the work.
Cantaloupe contains roughly 12–13 g of net carbs per cup. For moderate low-carb diets (50–100 g carbs/day), one cup fits easily. For stricter low-carb or keto plans (under 20–30 g/day), cantaloupe is harder to fit — half a cup (about 6 g net carbs) is a more workable portion. Its high water content makes it easy to overeat without realizing the carb accumulation, so measuring by cup is more reliable than eating by feel.
Watermelon actually has a higher GI (around 72–80) than cantaloupe, but like cantaloupe it also has a low glycemic load per typical serving due to its very high water content. The two are broadly comparable for blood sugar impact when eaten in similar-sized portions. Cantaloupe edges out watermelon slightly in nutritional density — it is exceptionally high in vitamin A and vitamin C. Neither is a major concern at a one-cup serving.
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Reviewed by
Curex Editorial TeamReviewed for accuracy
Last reviewed July 2026