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What Carb Has the Highest Protein? The Answer is Soybeans

3 min read

According to the USDA, a 1-cup serving of cooked soybeans contains approximately 28.62 grams of protein. This makes the soybean the highest-protein carbohydrate, offering a powerful combination of both macronutrients in a single, plant-based food.

Quick Summary

This article details that soybeans contain the most protein among high-carb foods. It explores the nutritional benefits of soybeans, along with other protein-rich carbs like lentils, chickpeas, and quinoa, for those seeking to maximize protein intake from plant sources.

Key Points

  • Soybeans are the top high-protein carb: Cooked soybeans contain approximately 28.62 grams of protein per cup, making them the most protein-dense option.

  • Soy is a complete protein: Unlike many other plant proteins, soybeans provide all nine essential amino acids needed by the human body.

  • Lentils are a close runner-up: Offering nearly 18 grams of protein per cooked cup, lentils are a versatile and fiber-rich legume.

  • Variety is key for plant-based diets: Combining different protein sources like beans and grains ensures a full spectrum of amino acids and nutrients.

  • Other notable high-protein carbs: Chickpeas (15g), quinoa (8g), and green peas (9g) are also excellent sources of protein.

  • Proper preparation can improve nutrition: Soaking dried legumes and rinsing canned beans can reduce anti-nutrients and sodium, respectively.

In This Article

Introduction to High-Protein Carbohydrates

While carbohydrates are primarily known as an energy source, many plant-based options are also excellent sources of protein. For those following a vegetarian, vegan, or flexitarian diet, identifying these high-protein carbs is essential for meeting nutritional needs. A varied diet incorporating these foods ensures you receive a balanced intake of amino acids, fiber, and other essential nutrients.

The Highest Protein Carbohydrate: The Mighty Soybean

The undisputed leader among high-protein carbohydrates is the soybean. Mature, cooked soybeans pack an impressive protein punch, with about 28.62 grams per cooked cup. Soybeans are unique among plant-based foods because they are a complete protein, meaning they contain all nine essential amino acids necessary for human health.

Besides their high protein content, soybeans offer numerous other health benefits. They are rich in fiber, which aids digestion, and contain isoflavones, plant compounds that have been linked to a reduced risk of certain cancers and the alleviation of menopause symptoms. Soybeans are incredibly versatile and can be enjoyed in many forms, including edamame (immature soybeans), tofu, tempeh, and soy milk.

Top Contenders: Other Protein-Rich Carbs

While soybeans take the top spot, several other carbohydrate-rich foods offer substantial amounts of protein and other nutrients. Incorporating a variety of these foods into your diet provides a broad spectrum of vitamins, minerals, and amino acids.

List of Excellent High-Protein Carbs

  • Lentils: These small but mighty legumes are a nutritional powerhouse. A single cooked cup contains almost 18 grams of protein and is also packed with fiber, B vitamins, and iron. Lentils are a staple in soups, stews, and salads.
  • Lupini Beans: Offering an impressive 26 grams of protein per cup when boiled, these nutrient-dense legumes are a strong competitor. They are also a great source of antioxidants, magnesium, and iron.
  • Chickpeas (Garbanzo Beans): With around 15 grams of protein per cooked cup, chickpeas are a versatile and delicious addition to any diet. They are the foundation of hummus and can be roasted for a crunchy, high-protein snack.
  • Green Peas: Often overlooked, green peas provide nearly 9 grams of protein per cooked cup, along with a healthy dose of fiber, vitamins, and minerals.
  • Quinoa: Though technically a seed, quinoa is classified as a whole grain and is one of the few complete plant-based proteins. A cooked cup offers 8 grams of protein, plus fiber, iron, and magnesium.
  • Oats: A breakfast classic, oats provide a moderate amount of protein with about 6 grams per cooked cup. They also offer complex carbohydrates and fiber, promoting sustained energy.
  • Wild Rice: This grain, which is actually the seed of an aquatic grass, provides around 6.5 grams of protein per cooked cup. It is also high in antioxidants and minerals.

Comparison of High-Protein Carbs

Food (per cooked cup) Protein Content (g) Key Nutritional Benefit
Soybeans ~28.62 Complete protein, rich in isoflavones
Lupini Beans ~26 High in antioxidants, low in fat
Lentils ~17.9 High in fiber, B vitamins, and iron
Chickpeas ~15 Versatile, great for heart health
Quinoa ~8 Complete protein, gluten-free
Green Peas ~8.58 Excellent source of vitamins C and K

Maximizing Your Intake of High-Protein Carbs

To get the most out of these nutrient-dense foods, it’s important to prepare and combine them properly. For dried legumes, soaking them overnight can improve digestibility and nutrient absorption. Rinsing canned beans helps reduce sodium levels. Combining different protein sources, like rice and beans, ensures you get a full spectrum of amino acids throughout the day. Experiment with different recipes, from hearty lentil soups and bean chilis to quinoa salads and edamame snacks.

Conclusion

While many people associate protein primarily with animal products, the plant kingdom offers a wealth of high-protein, carbohydrate-rich foods that are equally beneficial. The soybean stands out as the carbohydrate with the highest protein content, but other legumes, seeds, and grains like lentils, chickpeas, and quinoa are also excellent choices. By incorporating a variety of these foods into your diet, you can easily meet your protein goals while also reaping the benefits of increased fiber, vitamins, and minerals. Focusing on a diverse plant-based diet is a sustainable and healthy strategy for optimal nutrition.

Learn more about legumes and their nutritional benefits at The Nutrition Source by Harvard T.H. Chan School of Public Health.

Frequently Asked Questions

The highest protein carbohydrate overall is the soybean. A single cup of cooked soybeans provides approximately 28.62 grams of high-quality protein.

Yes, soybeans are considered a complete protein because they contain all nine essential amino acids that the body cannot produce on its own.

Cooked lentils offer nearly 18 grams of protein per cup, making them one of the most protein-rich legumes and a strong contender after soybeans.

Quinoa provides about 8 grams of protein per cooked cup and is one of the few plant sources considered a complete protein, making it an excellent choice.

Eating a variety of high-protein carbs, such as combining legumes and grains, helps ensure you get a full spectrum of essential amino acids and other vital nutrients.

Yes, legumes are an excellent and affordable source of plant-based protein that can significantly contribute to meeting daily protein needs, especially for vegetarians and vegans.

Oats offer a moderate amount of protein, with about 6 grams per cooked cup. While not the highest, they provide complex carbs and fiber for sustained energy.

References

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Medical Disclaimer

This content is for informational purposes only and should not replace professional medical advice.