Green Bean Glycemic Index
Low GI · The honest verdict
Gentle on blood sugar
Glycemic index
15–30
reported range
Glycemic load
1
Low GL
This food's glycemic index is 15–30, which is Low GI.
Green beans are one of the most diabetes-friendly vegetables. Their very low GI, minimal GL, and high fiber content mean they have virtually no effect on blood sugar in normal serving sizes. They can be eaten freely as part of a balanced meal. This is general nutrition information, not medical advice — people with diabetes should confirm dietary choices 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
Green beans have a very low GI of about 15–30 — one of the lowest among common vegetables.
One cup of cooked green beans provides 4.1 g of fiber — about 15% of the daily value.
Glycemic load of 10 or below is classified as low — green beans at GL 1 are among the lowest.
What's actually inside
Per 100 g, with your typical serving noted as 1 cup (125 g), cooked, drained. The carb family is what moves blood sugar — fiber is the number that softens the spike.
Total carbs
9.9g
Net carbs
5.8g
total carbs minus fiber
Fiber
4.1g
slows the glucose rise
- Sugars
- 4.6g
- Protein
- 2.4g
- Calories
- 44kcal
Notable nutrients
- Vitamin C12.1 mg
- Vitamin K43.2 µg
- Folate33 µg
- Manganese0.3 mg
- Potassium211 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
Excellent choice — very low blood sugar impact
Green beans are one of the most diabetes-friendly vegetables. Their very low GI, minimal GL, and high fiber content mean they have virtually no effect on blood sugar in normal serving sizes. They can be eaten freely as part of a balanced meal. This is general nutrition information, not medical advice — people with diabetes should confirm dietary choices with their care team.
Portion guidance
Green beans are so low in carbs and GL that portion restriction is generally unnecessary for blood sugar management. A full cup of cooked green beans contains only about 6 g of net carbs and a GL of 1. Even larger servings (2–3 cups) remain well within low-GL territory. They are a free vegetable for most diabetes meal plans.
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.
Boiling or steaming
Little effectBoiling or steaming green beans until tender-crisp preserves their low GI. Overcooking until very soft can slightly increase GI by breaking down fiber structure, but the effect is minimal for this low-carb vegetable.
Sautéing in oil or butter
Little effectAdding fat does not meaningfully change the GI of green beans. Fat may slightly slow gastric emptying, which could modestly reduce the overall glycemic response of a mixed meal.
Canning
Raises GICanned green beans may have a slightly higher GI than fresh-cooked due to the high-heat processing that softens cell walls. However, the difference is small and the GI remains very low. Watch for added sodium in canned varieties.
Freezing and reheating
Little effectFrozen green beans have a similar GI to fresh. Reheating does not significantly alter their glycemic impact. They are a convenient, equally low-GI option.
Pairing tip
Green beans pair well with almost any protein source — chicken, fish, beef, tofu, or eggs — to create a balanced, blood-sugar-friendly meal. Their neutral flavor complements herbs like garlic, lemon, and dill without adding sugar. Avoid heavy cream sauces or sweet glazes that would add unnecessary carbs.
Why GI numbers vary
Green bean GI data is limited, but published values consistently fall in the very low range — typically 15 to 30. The variation reflects differences in cooking time, variety, and measurement methodology rather than meaningful disagreement. Even at the upper end of this range, green beans remain a low-GI food with negligible glycemic load. We report the range honestly and classify green beans as low GI.
Not medical advice. This page is general nutrition information about Green Bean. 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
Green beans have a very low glycemic index, typically reported between 15 and 30. This places them firmly in the low-GI category. Their glycemic load is also very low — about 1 per cup — because they contain relatively few carbohydrates. Even the higher end of the range is well below the low-GI threshold of 55.
Yes, green beans are excellent for diabetes management. They are a non-starchy vegetable with minimal carbs, a very low GI, and a glycemic load of about 1 per cup. They provide fiber, vitamins, and minerals without raising blood sugar. Most diabetes meal plans list green beans as a free vegetable that does not need to be counted toward carbohydrate limits. People with diabetes should still discuss their overall diet with their care team.
Green beans are very different from dried beans like kidney beans or chickpeas. Green beans are harvested immature and contain far fewer carbs and starch. Dried beans have a moderate GI (around 30–50) and a higher GL due to greater carbohydrate density. Green beans are much lower in both GI and GL, making them a lighter option.
Absolutely. Green beans are low in net carbs — about 6 g per cup cooked — making them suitable for low-carb and even keto diets. They provide fiber and nutrients without using up a significant portion of your daily carb allowance. They are one of the most commonly recommended vegetables for low-carb eating plans.
Cooking method has only a minor effect on green beans' GI. Overcooking until very soft can slightly raise the GI by breaking down fiber, but the effect is small. Steaming or boiling to tender-crisp preserves the lowest GI. Adding fat (butter, oil) does not raise GI and may slightly blunt the glycemic response of a meal. Avoid sweet glazes or sugary sauces.
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Reviewed by
Curex Editorial TeamReviewed for accuracy
Last reviewed July 2026