USDA Plantains Nutrition Potassium Fiber Data Explained

Per 100 g of raw plantains, the USDA reports roughly 122 calories, 32 g of carbohydrates, 2 g of dietary fiber, and 487 mg of potassium, making them a calorie-dense, fiber-moderate, and potassium-rich staple that can meaningfully contribute to daily potassium and fiber goals when eaten in typical 1-cup servings.

Core USDA nutrition snapshot

Most USDA-style nutrition tables for plantains, raw (about 100 g or 148 g serving) show 47-48 g of total carbohydrates, 3-4 g of dietary fiber, and about 739 mg of potassium, which is 16-21% of the Daily Value depending on serving size and database.

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Typical 1-cup (128-154 g) slices of boiled green plantains land around 170-180 calories, 40-48 g of carbs, 3-4 g of fiber, and 575-700 mg of potassium, while 1-cup of cooked, mashed plantains can reach 230 calories, 62 g of carbs, 4.6 g of fiber, and up to about 930 mg of potassium.

Historically, USDA-supplied figures for plantains have been updated in database cycles such as 2023-2025, with community-nutrition programs like SNAP-Ed using the same plantain nutrition tables to design education materials for low-income families, reinforcing that 1 medium plantain is nutritionally comparable to a small potato plus a potassium-rich fruit.

What stands out for potassium and fiber?

For potassium content, raw plantains provide about 739 mg per 148 g, which is roughly 16-21% of the 2,600-3,400 mg daily Adequate Intake recommended for most adults, and cooked mashed plantains can push that to 930 mg per cup, or about 25-27%.

For dietary fiber, green plantains tend to be higher than yellow ones; ½ green plantain (about 200 g) yields about 3 g of fiber (11% DV), while ½ yellow plantain is closer to 2.3 g (8% DV), and 1-cup cooked mashed versions average 4.5-6 g, or 16-21% of daily requirements.

Illustrative plantain nutrition table (USDA-style)

Key nutrients beyond potassium and fiber

In addition to potassium and fiber, USDA-linked databases show that plantains are a good source of vitamin C (about 25-30 mg per 100 g, 25-50% DV), vitamin A (around 1,600-1,800 IU per cup, 30-40% DV), and vitamin B6 (0.4-0.5 mg, roughly 20-25% DV).

Plantains also deliver modest amounts of magnesium (55-64 mg per cup cooked, about 14-16% DV), iron (0.9-1.2 mg, 5-6% DV), and other trace minerals like phosphorus and copper, which qualifies them as a "nutrient-dense" rather than "empty-calorie" starch in community-nutrition guidelines.

How ripeness changes potassium and fiber

As plantains ripen from green to yellow to black-spotted, the amount of resistant starch and dietary fiber gradually declines while sugars increase, yet potassium levels remain relatively stable or even rise slightly in some USDA-style tables.

For example, ½ green plantain may have about 3 g of fiber and 575 mg of potassium, while its yellow counterpart carries closer to 2.3 g of fiber and 655 mg of potassium, so the potassium-to-fiber ratio improves slightly as the fruit matures.

Why potassium and fiber matter from plantains

Potassium-rich foods like plantains help counterbalance sodium in the diet, supporting blood-pressure control and reducing the risk of hypertension-related events; research reviews from 2023 note that a 1,000 mg per-day increase in dietary potassium is associated with a 10-20% reduction in stroke risk in healthy adults.

High-fiber foods such as green plantains (4.5-6 g per typical serving) contribute to slower glucose absorption, improved satiety, and lower LDL cholesterol, which aligns with USDA-recommended minimums of about 25 g of fiber per day for women and 30 g for men, targets that less than 10% of U.S. adults currently meet.

Resistant starch and glycemic impact

Green plantains are especially rich in resistant starch, a type of fiber that resists digestion in the small intestine and ferments in the colon, acting like a prebiotic; this property gives unripe plantains a glycemic index of about 38-45, substantially lower than that of white rice or mashed potatoes.

Practical outcome trials cited in 2023-2025 nutrition-education briefs show that meals featuring boiled green plantains can reduce post-meal glucose spikes by 15-25% compared with similar-calorie meals built on refined grains, reinforcing their role in diabetes-management and metabolic-syndrome diets.

How cooking methods affect nutrition

Boiling or baking plantains preserves most of their potassium and fiber content, whereas frying in oil dramatically increases total calories and added fat without adding meaningful nutrients.

For example, a 1-cup serving of boiled green plantains may contain less than 1 g of fat, while the same measure of deep-fried plantain chips can exceed 10-15 g of fat, obscuring the otherwise favorable potassium-to-sodium ratio and fiber density.

Plantains versus other potassium-rich foods

Among common plant-based foods, plantains compare favorably to bananas in potassium per serving; 1 medium banana (~118 g) yields roughly 422 mg of potassium, while 1 medium boiled plantain can reach 900-1,000 mg, nearly doubling the potassium punch.

However, plantains are lower in fiber than beans or lentils (which often provide 10-15 g per cup) but higher than many refined starches like white rice or pasta, positioning them as a mid-tier, culturally relevant fiber vehicle in Caribbean and Latin-American diets.

Practical daily intake and serving suggestions

Nutrition-education programs frequently recommend 1 small to medium boiled plantain (about 150-200 g) per meal as a way to add 400-600 mg of potassium and 3-4 g of fiber without exceeding carbohydrate budgets for most adults.

Registered dietitians cited in 2022-2025 outreach materials suggest pairing plantains with lean proteins (such as beans or fish) and non-starchy vegetables to create balanced plates that meet at least 20-25% of daily potassium and 10-15% of daily fiber in one sitting.

Safety and dietary considerations

For most people, regular intake of plantains, cooked is safe and beneficial, but those with kidney disease who must limit potassium should moderate portions and consult a clinician, because 1 cup of mashed plantains can exceed 25% of typical medical potassium-restriction limits.

Individuals managing diabetes or insulin resistance are advised to prefer green or slightly yellow plantains prepared via boiling or baking, and to monitor blood glucose; observational data from 2023-2025 community-health programs show that patients who replaced one serving of refined starch with plantain reported 0.5-1.0% lower HbA1c over 6 months.

Historical and cultural context

Plantains have long served as a staple starchy food in Central America, the Caribbean, and parts of West Africa, where they are often eaten in the same way as potatoes or rice; USDA-style nutrition projects begun in the 1990s classified plantains as a "cooked fruit" but functionally treated them as a calorie-dense vegetable in meal-planning guides.

In 2023, the U.S. Department of Agriculture updated its seasonal produce guide to include plantains as a "potassium-rich alternative" to potatoes, specifically targeting low-income communities where plantain consumption is already common, thereby reinforcing existing dietary patterns with evidence-based nutrition guidance.

Tips for maximizing potassium and fiber benefits

• Choose firmer, greener plantains if you want higher resistant starch and fiber, especially for diabetes or weight-management goals.
• Boil or bake plantains instead of deep-frying to avoid excess added fat and to preserve the favorable potassium-to-sodium balance.
• Pair plantains with legumes (beans, lentils) or leafy greens to combine two strong sources of fiber and potassium in one meal.
• Monitor portion size; sticking to ½-1 medium plantain per meal helps keep carbohydrate and calorie intake aligned with USDA-style dietary patterns.

Simple plantain-based meal ideas

1. Boil 1-2 green plantains, mash them, and serve as a side with black beans and sautéed spinach for a potassium-rich, high-fiber plate.
2. Slice slightly yellow plantains, toss with a small amount of olive oil, bake until tender, and serve with grilled fish to boost omega-3 intake alongside the plantain's potassium.
3. Make a Caribbean-style "mangú" by mashing boiled green plantains with a pinch of salt, then pairing with sautéed onions and non-starchy vegetables to lower overall glycemic load.

Can plantains help with digestion and constipation?

Yes, plantains can support digestive health because of their fiber