Protein in Lentils: By Type, Why They're a Budget Protein King, and Complete Protein Combos

The quick answer: One cup (198g) of cooked lentils contains 18g of protein with 230 calories and 16g of fiber. Lentils deliver both protein and fiber in a single food — a combination that is rare and incredibly effective for satiety, gut health, and blood sugar control. At roughly 2 cents per gram of protein, lentils are also one of the most affordable protein sources on the planet.

How Much Protein Is in Lentils?

Lentils are a legume that punch well above their weight in the protein department. Among plant-based foods, they are second only to soybeans in protein density. Here is the protein by serving size for cooked lentils:

Note that 1/4 cup of dry lentils yields approximately 1/2 to 3/4 cup cooked. Lentils roughly double to triple in volume when cooked, depending on the variety.

Protein by Lentil Type

Different lentil varieties have slightly different protein contents and very different cooking characteristics:

The protein content is remarkably consistent across varieties — the real difference is in texture and application:

• Red and yellow lentils break down into a creamy consistency, making them perfect for soups, dals, and sauces
• Green, French, and black lentils hold their shape, making them ideal for salads, grain bowls, and side dishes
• Brown lentils are the all-purpose variety, versatile enough for most applications

The Protein and Fiber Combo: Why Lentils Are Special

Very few foods deliver both significant protein and fiber in the same package:

The combination of protein and fiber makes lentils exceptionally filling. Protein slows gastric emptying and stimulates satiety hormones, while fiber adds bulk and feeds beneficial gut bacteria. Together, they can keep you full for 4-5 hours after a meal — a major advantage for weight management.

Complementary Proteins: Lentils and Rice Make a Complete Protein

Lentils are not a complete protein on their own — they are low in the amino acid methionine. However, grains (like rice) are high in methionine but low in lysine, where lentils excel. Combining them creates a complete amino acid profile:

You do not need to eat lentils and rice in the same meal — consuming both within the same day is sufficient for your body to use the complementary amino acids. But the classic pairing of lentils and rice (dal and rice, mujaddara, kitchari) has been a nutritional staple in cultures worldwide for thousands of years.

Other foods that complement lentils:

• Any grain — rice, bread, tortillas, pasta, quinoa
• Nuts and seeds — sesame, sunflower, pumpkin seeds
• Corn — tortillas, polenta

Lentils as Budget Protein

Lentils are arguably the cheapest protein source available:

At just over 1 cent per gram of protein from dry lentils, nothing comes close. Even chicken breast costs more than double. Canned lentils are more expensive per gram of protein but save significant cooking time.

A single $1.50 bag of dry lentils provides 108g of protein — enough for 6 servings of 18g each. For anyone eating on a tight budget, lentils should be a dietary staple.

How to Cook Lentils

Lentils are one of the easiest legumes to prepare — no soaking required:

Basic Stovetop Method

1. Rinse lentils under cold water and pick out any debris
2. Add to a pot with 3 cups of water per 1 cup of lentils
3. Bring to a boil, then reduce to a simmer
4. Cook until tender (15-35 minutes depending on variety)
5. Drain any excess water
6. Season with salt, pepper, and desired spices

Instant Pot / Pressure Cooker

1. Add rinsed lentils with 2.5 cups water per 1 cup lentils
2. Cook on high pressure for 10-12 minutes (green/brown) or 5-8 minutes (red)
3. Quick release or natural release for 5 minutes
4. Drain and season

Tips for Perfect Lentils

• Add salt after cooking — salt can toughen the skins during cooking
• Add acid (lemon, vinegar, tomatoes) after cooking — acid also prevents softening
• Do not overcook if you want them to hold their shape for salads
• Slightly overcook if you want a creamy consistency for soups and dals

Lentil Meal Prep Ideas

Cooked lentils store well and are incredibly versatile:

Red Lentil Dal

Cook red lentils with onion, garlic, ginger, turmeric, cumin, and coconut milk. Serve over rice for a complete protein meal. Each serving provides about 18g protein with rice. Makes 6 servings from one batch.

Lentil Salad Jars

Layer cooked green or French lentils with diced vegetables, feta cheese, and vinaigrette in mason jars. Each jar provides about 15g protein from lentils alone, plus additional protein from cheese.

Lentil Bolognese

Replace ground beef with cooked brown lentils in your favorite pasta sauce. One cup of lentils provides 18g protein — comparable to 3 oz of ground beef but with 16g of fiber and a fraction of the cost.

Storage

Cooked lentils last longer in the fridge than most cooked proteins (5-7 days vs 3-4 days for chicken or beef), making them ideal for Sunday meal prep.

Lentil Nutrition Beyond Protein

One cup of cooked lentils also provides:

• Folate: 90% of the daily value (one of the highest food sources)
• Iron: 37% of the daily value (non-heme, pair with vitamin C for better absorption)
• Manganese: 49% of the daily value
• Phosphorus: 36% of the daily value
• Thiamine (B1): 22% of the daily value
• Potassium: 21% of the daily value
• Zinc: 17% of the daily value

The folate content is especially notable. One cup of lentils provides nearly the entire daily requirement, making them one of the best natural sources of this essential B vitamin.

Frequently Asked Questions

Are lentils a good source of protein?

Yes. At 18g per cup cooked, lentils are among the highest-protein plant foods. They are not as protein-dense per calorie as chicken breast or tofu, but the combination of protein, fiber, and micronutrients makes them nutritionally exceptional — especially at their price point.

Do lentils have more protein than beans?

Yes, slightly. Lentils provide about 18g per cup cooked, while most beans provide 12-15g (black beans 15g, kidney beans 13g, chickpeas 15g). Only soybeans (29g per cup) significantly outperform lentils among legumes.

Can you build muscle with lentils as your main protein?

You can, but it requires eating larger volumes because lentils have fewer grams of protein per calorie than animal sources. A muscle-building diet requiring 150g of protein per day would need about 8.3 cups of cooked lentils — 1,900 calories from lentils alone. Most people combine lentils with other protein sources (tofu, tempeh, seitan, dairy, eggs) for a more practical approach.

Are lentils hard to digest?

Lentils can cause gas and bloating, especially if you are not used to eating legumes regularly. To minimize digestive issues: start with small servings and increase gradually, rinse canned lentils thoroughly, cook dry lentils well, and try red lentils first (they are the easiest to digest because they have no outer skin).

How much protein is in lentil soup?

A typical serving of lentil soup (about 1.5 cups) contains 12-15g of protein, depending on the recipe. The protein comes primarily from the lentils, with small contributions from any vegetables or broth used.

Are lentils keto-friendly?

No. One cup of cooked lentils contains about 40g of carbs (24g net carbs after subtracting fiber), which exceeds the typical keto limit of 20-50g net carbs per day. Lentils are better suited for balanced, Mediterranean, or plant-based diets.

Do I need to soak lentils before cooking?

No. Unlike most dried beans, lentils do not require soaking. They cook relatively quickly (15-35 minutes depending on the variety) without any pre-soaking. Soaking for 2-4 hours can reduce cooking time by about 5-10 minutes but is not necessary.

What is the difference between red and green lentils nutritionally?

The protein and calorie content is nearly identical. The main difference is texture: red lentils dissolve when cooked (great for soups and dal), while green lentils hold their shape (great for salads and grain bowls). Red lentils also cook about 10 minutes faster.

Track Lentils and Hit Your Protein Goals

Lentils are easy to batch cook but tricky to portion accurately by eye. Mealift lets you log lentils by type and amount — dry or cooked — and instantly see how they contribute to your daily protein, fiber, and calorie targets.