Refried beans are a solid source of plant protein. A one-cup serving of canned refried beans contains roughly 14 grams of protein, and even a standard half-cup side dish delivers 5 to 8 grams depending on the brand. That puts refried beans in the same ballpark as two eggs or a glass of milk.
Protein per Serving by Brand
The protein content in refried beans varies more than you might expect from one brand to the next. Based on a half-cup serving (the amount listed on most cans), here’s what several popular options deliver:
- Goya Traditional Refried Beans: 8 g protein
- La Preferida Authentic Refried Beans: 6 g protein
- Rosarita Traditional Refried Beans: 5 g protein
The gap comes down to ingredients. Some brands add more lard or oil, which increases fat and calories without adding protein. Others use a higher bean-to-filler ratio, which bumps the protein up. If protein is your priority, check the nutrition label and compare per serving. Goya’s vegan version, for example, packs 60% more protein per serving than Rosarita’s traditional recipe.
How Complete Is the Protein?
Not all protein is equal. Your body needs eight essential amino acids from food, and animal proteins like meat, eggs, and dairy supply all of them. Beans provide most of them in good amounts, particularly lysine, but they fall short on sulfur-containing amino acids (methionine and cysteine). That makes beans an “incomplete” protein on their own.
How much this matters depends on how you measure it. Researchers use a scoring system that accounts for both the amino acid profile and how well your body actually digests the protein. Cooked black beans score about 0.38 out of a possible 1.0 on this scale, which is modest compared to animal proteins that score at or near 1.0. A study on pinto beans (the most common base for refried beans) found that adults digest about 77% of the essential amino acids, with an overall protein quality score of 83% when measured against adult nutritional requirements. That’s meaningfully higher than older estimates suggested, likely because the cooking and mashing process in refried beans helps break down compounds that inhibit digestion in whole beans.
The practical takeaway: your body absorbs and uses a good portion of the protein in refried beans, but not quite as efficiently as protein from animal sources.
Pairing With Rice for Complete Protein
The classic combination of beans and rice isn’t just tradition. It’s nutritional strategy. Beans lack sufficient methionine and cysteine, while rice lacks sufficient lysine. Eaten together, each fills in what the other is missing, creating a complete protein that supplies all eight essential amino acids your body needs. The American Heart Association specifically highlights beans and rice as a pairing that achieves this.
Research backs this up with numbers. When cooked beans are combined with cooked rice, the protein quality score jumps from 0.38 to 0.47. That’s a 24% improvement just from adding rice. You don’t need to eat them in the same bite or even the same meal. As long as you’re getting both throughout the day, your body can use the amino acids together.
A burrito with refried beans and rice, or a plate of refried beans alongside rice and tortillas, gives you a complete protein source without any meat. Corn tortillas also complement beans well, contributing amino acids that beans are low in.
How Refried Beans Compare to Other Protein Sources
At about 14 grams per cup, refried beans hold their own against many common protein foods. A cup of cooked lentils has around 18 grams, chickpeas about 15 grams, and a cup of milk around 8 grams. Refried beans sit comfortably in the middle of the plant protein range.
Where refried beans stand out is convenience and versatility. They’re inexpensive, shelf-stable, and ready to eat straight from the can. They also bring fiber (around 12 grams per cup), iron, and potassium along with the protein, which makes them more nutritionally dense than many other quick protein options. The main thing to watch is sodium, since canned versions can pack 500 to 1,000 milligrams per serving. Low-sodium versions are widely available if that’s a concern.
For anyone relying on refried beans as a regular protein source, the simplest way to maximize their value is to pair them with a grain. A half-cup of refried beans with a cup of rice gives you roughly 12 to 15 grams of complete, well-rounded protein for very little cost.