Low Glycemic Index Foods: The List, and How to Use It Well

Published on 25 September, 2026

The glycemic index is a genuinely useful tool that is routinely used badly. It ranks carbohydrate foods by how quickly they raise blood glucose, and that ranking is real—but it says nothing at all about whether a food is good for you.

Here is the list, what the evidence supports, and the four limitations that decide whether the number is worth acting on.

What the Glycemic Index Measures

The glycemic index scores a carbohydrate food from 0 to 100 according to how much it raises blood glucose over two hours, compared with pure glucose, which is set at 100.

Band	Score	Meaning
Low	55 or below	Slower, flatter rise in blood glucose
Medium	56 to 69	Intermediate
High	70 or above	Faster, sharper rise

One detail explains most of the confusion around it. The index is measured using a portion of each food containing 50 grams of available carbohydrate—not a realistic serving. For watermelon, that is roughly a kilogram of fruit. Nobody eats that, which is why watermelon's high glycemic index matters far less than the number suggests.

Glycemic Load Fixes the Portion Problem

Glycemic load takes the index and multiplies it by the carbohydrate in an actual serving, which makes it the more practical of the two measures.

Low glycemic load: 10 or below per serving
Medium: 11 to 19
High: 20 or above

Watermelon is the standard illustration. Its glycemic index is high, its glycemic load in a normal slice is low, and the second figure is the one that reflects what happens when you eat it. Where the two disagree, trust the load.

The Low Glycemic Foods List

Published values differ between databases, because the same food varies by variety, ripeness, processing and cooking. Grouping foods into bands is more reliable than quoting a precise number for any of them.

Category	Low glycemic choices	Higher glycemic alternatives
Grains	Steel-cut and rolled oats, barley, bulgur, quinoa, whole rye, pasta cooked firm	Instant oats, white bread, most breakfast cereals, rice cakes
Rice	Basmati, wild rice, parboiled rice	Short-grain white rice, jasmine, sticky rice
Legumes	Lentils, chickpeas, kidney beans, black beans, soybeans	None in this group; legumes are uniformly low
Vegetables	Most non-starchy vegetables, sweet potato, carrots	Potato, particularly baked or mashed; parsnip
Fruit	Apples, pears, berries, cherries, oranges, plums	Very ripe banana, pineapple, dates, dried fruit
Dairy	Milk, plain yogurt	Sweetened yogurts and flavored milk drinks
Nuts and seeds	All of them	None; nuts are very low
Sweeteners	None are low in practical terms	Glucose, most syrups and sugars

The pattern underneath the table is simple. Whole, intact, fibrous and minimally processed foods sit low. Finely milled, heavily processed and quickly digested foods sit high.

What the Evidence Shows

A 2026 systematic review and meta-analysis pooled 25 randomized controlled trials covering 1,973 participants aged 12 to 75.

Low glycemic index diets significantly reduced fasting blood glucose, glycated hemoglobin—the three-month measure of average blood sugar—by 0.22 percentage points, and low-density lipoprotein (LDL) cholesterol. Changes in high-density lipoprotein cholesterol, fasting insulin, insulin resistance and triglycerides did not reach statistical significance.

A reduction of 0.22 in glycated hemoglobin is modest but real, and comparable to what some dietary interventions achieve. For someone managing type 2 diabetes it is worth having; it is not on the scale of medication.

Four Limitations Worth Knowing

A 2025 review in the Journal of Nutrition examined dietary approaches built around post-meal blood glucose and set out where the logic breaks down. The central point is that foods producing a lower glucose response do not automatically improve long-term health, because they can affect risk through entirely separate pathways.

A low score does not mean a healthy food

This is the big one. Fat and protein slow glucose absorption, so adding either lowers the glycemic index. Chocolate, ice cream and many crisps score lower than a boiled potato. Using the index alone as a food filter produces some genuinely poor recommendations.

The number moves

Ripeness changes it—a green banana and a spotted one are not the same food. So does cooking: pasta cooked firm has a lower index than the same pasta cooked soft. Cooling cooked potato or rice forms resistant starch and lowers it again. Published values are averages across all of that variation.

Nobody eats foods alone

The index is measured on a single food in isolation. Add fat, protein, acid or fiber from the rest of the meal and the response changes substantially. In a mixed meal the individual figures stop being predictive.

People differ

Responses to identical foods vary widely between individuals, enough that two people eating the same bread can produce quite different glucose curves. Published values describe an average, not you.

The Cooling Trick, and Why It Works

One of the more useful practical findings has nothing to do with which foods you buy and everything to do with how you handle them after cooking.

When starchy foods such as potato, rice and pasta are cooked and then cooled, some of their starch reorganizes into a form the small intestine cannot readily digest, called resistant starch. It behaves more like fiber than like starch, passing through to the large intestine where gut bacteria ferment it.

The result is a lower blood glucose response from the same food, and some of the effect survives gentle reheating. Cooking rice or potatoes the day before, refrigerating them overnight and reheating the next day is a genuine, free intervention. It is also why a potato salad behaves differently from a hot baked potato.

How to Use It Sensibly

None of that makes the index useless. It makes it one input rather than a rule.

Use it to compare within a category, not across the whole diet. Which bread, which rice, which breakfast cereal—those are the questions it answers well.
Prefer glycemic load wherever both figures are available, since it accounts for the portion you will actually eat.
Do not let it override nutrition. A high-fiber wholegrain with a medium score beats a low-scoring processed snack every time.
Change how you cook as well as what you buy—pasta firm, potatoes cooled, oats steel-cut rather than instant.
Combine foods deliberately, since protein, fat, acid and fiber all flatten the response of whatever they are eaten with.

Who It Matters Most For

People with type 2 diabetes or prediabetes, where the modest reductions shown in trials are worth capturing
Anyone with reactive hypoglycemia or pronounced energy crashes after meals
People with polycystic ovary syndrome, where insulin resistance is commonly part of the picture
Anyone using a continuous glucose monitor, who can see their own responses rather than relying on published averages

For someone without a blood sugar problem eating a varied diet built on whole foods, the glycemic index is largely academic. The pattern that produces a low-glycemic diet is the same pattern that produces a good diet generally.

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FAQs

Q: What is considered a low glycemic index food?

A: A score of 55 or below. Medium is 56 to 69 and high is 70 or above, measured against pure glucose at 100.

Q: What is the difference between glycemic index and glycemic load?

A: The index measures how fast a fixed amount of carbohydrate raises blood glucose. The load adjusts that for how much carbohydrate is in a realistic serving.

Q: Why is watermelon high glycemic index but still fine to eat?

A: Because the index is measured using a portion containing 50 grams of carbohydrate, which for watermelon is roughly a kilogram. A normal slice has a low glycemic load, and that reflects what actually happens.

Q: Does a low glycemic index mean a food is healthy?

A: No, and this is the most important caveat. Fat and protein slow glucose absorption, so chocolate and ice cream score lower than a boiled potato. The index measures one thing only.

Q: Do low glycemic diets actually work?

A: They help, modestly so. Pooled data from 25 trials found reductions in fasting glucose, glycated hemoglobin and low-density lipoprotein cholesterol. Insulin, insulin resistance and triglycerides did not change significantly.

Q: Does cooking change the glycemic index?

A: It changes it considerably. Pasta cooked firm scores lower than the same pasta cooked soft, and cooling cooked potato or rice forms resistant starch that lowers it further. Ripeness does the same for fruit.

Q: Which rice has the lowest glycemic index?

A: Basmati is generally the lowest of the common white rices, with parboiled rice also lower than standard. Short-grain, jasmine and sticky rice sit higher.

Q: Is fruit bad because of its sugar?

A: No. Most whole fruit is low to medium glycemic and comes with fiber and water that slow absorption. Dried fruit and juice concentrate the sugars and behave quite differently.

Q: Can I lower the glycemic response of a meal I have already chosen?

A: Yes, to a degree. Adding protein, fat, acid such as vinegar or lemon, or fiber slows the response of whatever they are eaten alongside. The order you eat things in also makes a measurable difference.

Q: Should someone without diabetes worry about glycemic index?

A: There is little need. The dietary pattern that produces a low-glycemic diet—whole grains, legumes, vegetables, nuts, minimally processed food—is the same one recommended for general health anyway.

Sources

Sun X, et al. Low glycemic index diets on glycemic and lipid control across diverse populations: a systematic review and meta-analysis. Current Diabetes Reviews, 2026. PMID 42393878
Del Carmen Fernandez-Figares Jimenez M. Postprandial blood glucose-focused dietary approaches and their limitations. The Journal of Nutrition, 2025. PMID 41047106
Jenkins DJA, Dehghan M, Mente A, et al. Association of glycaemic index and glycaemic load with type 2 diabetes, cardiovascular disease, cancer, and all-cause mortality. The Lancet Diabetes and Endocrinology, 2024. PMID 38272606

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