Starchy fruits are fruits that store most of their carbohydrates as starch rather than simple sugars like fructose or glucose. The most common examples are plantains, green bananas, and breadfruit. Unlike the sweet, juicy fruits most people think of, starchy fruits taste bland or starchy when raw and are typically cooked before eating, much like potatoes or rice.
The Most Common Starchy Fruits
Plantains are the most widely eaten starchy fruit in the world. A raw plantain contains about 32 grams of carbohydrates per 100 grams, with most of that coming from starch rather than sugar. They look like large bananas but are firmer, less sweet, and almost always cooked. In Latin American, Caribbean, and West African cuisines, plantains are boiled, fried, or roasted as a staple carbohydrate source.
Green (unripe) bananas are nutritionally very different from the ripe yellow bananas you eat as a snack. An unripe banana contains roughly 21 grams of starch per 100 grams. As the banana ripens and develops brown spots, that number drops to about 1 gram per 100 grams. The starch converts almost entirely to sugar during ripening, which is why ripe bananas taste so much sweeter. Green bananas are used in cooking across South Asia, the Caribbean, and parts of Africa.
Breadfruit is one of the starchiest fruits in existence. About 69% of the dry weight of raw breadfruit is starch, with only small amounts of glucose (around 6%), sucrose (7%), and fructose (8%). Native to the Pacific Islands, breadfruit has a dense, potato-like texture when cooked and serves as a primary carbohydrate source in many tropical regions.
Botanical Fruits You Might Not Recognize
Several foods commonly called “starchy vegetables” are technically fruits in botanical terms, since they develop from the flower of a plant and contain seeds. Butternut squash, corn, and peas all fit this category. Even beans and chickpeas are technically the seeds inside fruit pods. These are all high in starch and treated as vegetables or grains in the kitchen, but they blur the line between the categories.
The distinction matters if you’re trying to understand carbohydrate content. When most people say “fruit,” they mean something sweet you eat raw. But botanically, fruit is a much broader category, and starchy fruits sit in that overlap between what we call fruits and what we treat as starches on the plate.
How Starch Affects Blood Sugar
Not all starchy fruits hit your bloodstream the same way. Green bananas and boiled breadfruit both have a low glycemic index (55 or under), meaning they raise blood sugar gradually. Green boiled plantains also fall in the low glycemic range. But ripe fried plantains jump to the high glycemic category (70 or above), because ripening converts starch to sugar and frying changes how quickly your body absorbs it.
This is a useful distinction if you’re managing blood sugar. The same fruit can behave very differently depending on how ripe it is and how you prepare it.
Resistant Starch and Gut Health
One of the most interesting things about starchy fruits, particularly green bananas and plantains, is their high content of resistant starch. This is a type of starch your small intestine can’t break down. Instead, it passes into your colon, where gut bacteria ferment it like fiber.
That fermentation feeds beneficial bacteria, particularly species of Bifidobacterium and Lactobacillus. These bacteria strengthen the gut barrier, reduce inflammation, and crowd out harmful microbes. An eight-week trial published in Nature Metabolism found that people eating resistant starch showed improved insulin sensitivity, better glucose tolerance, and lower levels of inflammatory markers in their blood. The participants also excreted more fat in their stool, suggesting resistant starch reduces how much dietary fat the body absorbs.
The catch is that cooking significantly reduces resistant starch content. Boiling unripe bananas for 45 minutes destroys about 80% of their resistant starch. Pressure cooking is even more aggressive, wiping out roughly 83% in just 15 minutes. The heat disrupts the ordered molecular structure that makes the starch resistant to digestion. So while a raw green banana is packed with resistant starch, a cooked one delivers far less. One workaround: cooling cooked starchy foods allows some of the starch to re-crystallize into a form that resists digestion again, though not to the original levels.
Where Starchy Fruits Fit in Your Diet
Starchy fruits function as energy-dense carbohydrate sources, closer to potatoes or rice than to apples or berries. One medium plantain provides a similar amount of carbohydrates to a medium baked potato. This makes them a solid base for meals, but it also means they’re calorie-dense compared to watery fruits like oranges or strawberries.
The WHO recommends that carbohydrate intake come primarily from whole grains, vegetables, fruits, and legumes, with at least 400 grams of vegetables and fruit per day and at least 25 grams of fiber. Starchy fruits contribute to both targets. They provide complex carbohydrates for sustained energy, dietary fiber (about 2 grams per 100 grams in plantains), and when eaten less ripe, meaningful amounts of resistant starch that functions as a prebiotic.
If you’re used to thinking of fruit as a sweet snack, starchy fruits require a mental shift. Think of them as a carbohydrate side dish. Boiled green plantains with beans, roasted breadfruit alongside grilled fish, or green banana curry are all traditional preparations that treat these fruits exactly as they are: filling, starchy staples that anchor a meal.