Green Peas: Nutrition Facts, Health Benefits, and the Vegetable That’s Secretly a Legume

Green peas occupy an unusual identity in the kitchen — universally treated and cooked as a vegetable, served alongside carrots and corn on every dinner plate, yet botanically they’re a legume, the same plant family as lentils, chickpeas, and beans. That distinction isn’t just trivia: it explains why peas carry a notably higher protein content than almost any other food typically served as a side vegetable, at 5.4g per 100g alongside 5.5g of fiber, 23% of daily manganese, 22% of Vitamin K and thiamine, and meaningful folate, Vitamin C, and copper — all for just 84 calories.

Green Peas Nutrition Facts (per 100g, cooked)

USDA’s figures for green peas, boiled and drained, without salt.

Green Peas Nutrition Facts (per 160g serving — approximately one cup, cooked)

One cup of cooked green peas is the standard dietary tracking reference:

A single cup of peas provides nearly 9g of protein and 9g of fiber — figures that rival or exceed many foods specifically marketed as high-protein or high-fiber, despite peas simply being a standard vegetable side.

Vitamins in Green Peas (per 100g, cooked)

Standout: Green peas’ Vitamin K content (22% DV per 100g, 35% per cup) is genuinely strong for a vegetable typically eaten as a side portion. Vitamin K activates osteocalcin, the protein that helps bind calcium into bone tissue, and matrix Gla protein, which helps prevent calcium from depositing in arterial walls — making it relevant to both bone health and cardiovascular health. The thiamine content (22% DV) is similarly impressive, supporting the conversion of carbohydrates into usable cellular energy.

Minerals in Green Peas (per 100g, cooked)

Standout: Manganese (23% DV per 100g) and copper (19% DV) are notably strong contributions from a vegetable most people don’t think of as a mineral source. Copper is essential for iron metabolism and collagen crosslinking, while manganese supports bone formation and the body’s mitochondrial antioxidant defenses. Zinc at 11% DV, and phosphorus, magnesium, and iron at 9% DV each, add smaller but useful contributions.

Why Peas Are a Legume, Not a Vegetable: The Botanical Story

This is a genuinely common point of confusion, and understanding it explains why peas behave nutritionally more like a small lentil than like a carrot or broccoli.

Botanically, legumes are plants in the Fabaceae family that produce their seeds inside a pod — beans, lentils, chickpeas, peanuts, and peas all qualify. The pea you eat is the seed of the plant, harvested while still young, soft, and sweet, in much the same way edamame is the young, immature form of the soybean.

This legume classification explains several of peas’ standout nutritional properties: their protein content (5.4g per 100g) is unusually high for something served as a vegetable side dish, their fiber content (5.5g per 100g) reflects the fiber-rich profile found across the legume family, and their amino acid profile, while not complete on its own, contributes meaningfully to overall dietary protein in the same way other legumes do.

Culinarily, however, peas are almost always treated and cooked as a vegetable — served as a side, added to rice dishes, or blended into soup — rather than prepared the way dried beans or lentils typically are. This is simply a matter of how the food is used in the kitchen, not a contradiction of its botanical identity.

Health Benefits of Green Peas

Strong Protein Content for a Vegetable

At 5.4g of protein per 100g — and nearly 9g per cup — green peas deliver meaningfully more protein than almost any other commonly eaten vegetable side dish. While the protein isn’t complete on its own (it’s relatively low in methionine, like most legumes), it still contributes usefully to total daily protein intake, particularly for anyone eating peas as a regular part of meals rather than an occasional garnish.

Vitamin K for Bone and Cardiovascular Health

As detailed above, the 22% DV Vitamin K per 100g supports the activation of bone-related osteocalcin and of matrix Gla protein, which helps prevent arterial calcification — making Vitamin K-rich foods relevant to long-term skeletal and cardiovascular health.

Folate for Cellular and Red Blood Cell Health

At 16% DV per 100g (25% per cup), folate supports DNA synthesis and cell division, red blood cell formation, and homocysteine regulation. This is particularly relevant for women who are or may become pregnant, given folate’s well-established role in preventing neural tube defects in early pregnancy.

Genuine Fiber Contribution

The 5.5g of fiber per 100g (8.8g per cup) is substantial for a vegetable typically eaten in modest portions, supporting both digestive regularity and the slower, more stable blood sugar response that comes with fiber-containing carbohydrates rather than refined ones.

Vitamin C and Iron Working Together

Peas provide both Vitamin C (16% DV per 100g) and iron (9% DV per 100g, non-haem form) in the same food — a useful pairing, since Vitamin C enhances the absorption of non-haem iron eaten at the same time, making peas a more effective iron contributor than the iron figure alone might suggest.

Antioxidant Compounds

Peas contain flavonoids and carotenoids, plant compounds with antioxidant properties that help neutralize free radicals, adding to peas’ nutritional value beyond their vitamin and mineral content.

Blood Sugar Management

The combination of fiber, modest natural sugar (5.9g per 100g), and a meaningful protein contribution gives peas a moderate glycaemic impact — lower than starchy vegetables such as potatoes — making them a reasonable choice for anyone managing blood sugar as part of a balanced meal.

Green Peas for Athletes and Active People

A Genuine Protein Contributor at the Side-Dish Level

Most vegetable side dishes contribute little protein to a meal — peas are a notable exception, adding a meaningful few grams that accumulate across a day of regular consumption, particularly useful for anyone tracking total daily protein intake.

Vitamin K and Bone Health

Vitamin K is involved in bone metabolism, which matters for athletes placing repeated mechanical stress on bone through resistance training and high-impact activity — and peas are one of the more accessible everyday sources of it.

Folate and Iron for Oxygen Transport

The combination of folate and Vitamin C-enhanced iron absorption supports the red blood cell production that underpins oxygen-carrying capacity — directly relevant to aerobic training performance and recovery.

A Practical, Low-Effort Side for Any Training Meal

Frozen peas need nothing more than a few minutes of boiling or microwaving, making them one of the easiest ways to add fiber, protein, and a broad spread of micronutrients to a meal — a genuinely practical choice on busy training days.

Fresh, Frozen, and Canned Peas: What’s the Difference?

Frozen peas — typically blanched and frozen within hours of harvest, which locks in nutrients close to peak freshness. Frozen peas often hold up as well as, or better than, “fresh” peas that have spent days in transport and storage, since fresh peas keep losing Vitamin C and natural sweetness after picking. In USDA’s data, cooked frozen peas come to 78 kcal, 5.2g of protein, and 4.5g of fiber per 100g — close to fresh.

Fresh peas (in the pod) — best used quickly after purchase or picking, since nutrient and sugar losses begin soon after harvest. An excellent option when in season and used promptly, but not meaningfully superior to good-quality frozen peas in most practical circumstances.

Canned peas — convenient and shelf-stable, but often higher in sodium (and sometimes sugar) from the canning liquid, and the higher heat of canning causes greater loss of heat-sensitive vitamins like Vitamin C and folate than freezing. Rinsing canned peas before use reduces some of the added sodium.

For most practical purposes, frozen peas offer the best balance of convenience, nutrient retention, and cost.

Practical Ways to Include Green Peas in Your Diet

As a simple side dish — boiled or steamed for a few minutes with a small amount of butter or olive oil, which also aids absorption of the fat-soluble Vitamin K.

Stirred into rice dishes — a classic addition to pilafs, fried rice, and risottos, adding color, protein, and fiber with minimal extra preparation.

Blended into soup — pea soup, made with split peas or with fresh or frozen peas blended with stock and mint, is a simple way to turn peas into a more substantial, protein-containing meal.

Added to pasta dishes — peas pair well with cream-based or pesto pasta sauces, adding texture, sweetness, and nutritional value to an otherwise carbohydrate-and-fat-dominant meal.

In curries and stews — peas hold their texture well in slow-cooked dishes and are a common addition to South Asian curries, adding both substance and nutrition.

As a topping for grain bowls or salads — adding a handful of cooked peas to a grain bowl or salad boosts protein and fiber content with very little additional preparation effort.

Potential Considerations

Vitamin K and blood thinning medications — as with other Vitamin K-rich foods, people taking warfarin should keep their pea intake consistent rather than making large sudden changes, since Vitamin K directly affects how this medication works.

FODMAPs and digestive sensitivity — like other legumes, peas contain fermentable carbohydrates that can cause gas or bloating in some people, particularly those with irritable bowel syndrome; smaller portions are usually better tolerated.

Purines — peas contain a moderate amount of purines, which the body breaks down into uric acid. Unlike purines from meat and seafood, purines from vegetables and legumes haven’t been linked with a higher risk of gout in large studies, though people with gout may still want to watch portions during flare-ups.

Sodium in canned varieties — as noted above, canned peas can carry meaningfully more sodium than fresh or frozen due to the canning liquid; rinsing before use reduces this.

Nutrient data: USDA FoodData Central, SR Legacy — peas, green, cooked, boiled, drained, without salt (FDC ID 170420); frozen comparison from FDC ID 170017. % Daily Values use the FDA’s current Daily Values.