Calories in Kidney Beans: Full Nutrition Breakdown

Kidney beans are large, kidney-shaped legumes valued for their firm texture and robust flavor. A cup of cooked red kidney beans provides approximately 15.3 grams of protein, 13.1 grams of fiber, and is an excellent source of folate, iron, manganese, and thiamine. They are a classic ingredient in chili, soups, rice and beans dishes, and salads around the world.

Calories by serving size:

Kidney beans are also notable for their iron content, providing about 3.9 mg per cup (22% of the daily value). They contain significant amounts of molybdenum, phosphorus, and copper, supporting energy production and bone health.

Frequently Asked Questions (FAQ)

How do kidney beans compare to black beans?

Kidney beans and black beans are nutritionally very similar, with nearly identical calorie counts per cup (225 vs 227). Black beans have slightly more fiber (15 g vs 13 g per cup), while kidney beans are marginally higher in protein (15.3 g vs 15.2 g). The biggest difference is texture and flavor — kidney beans are larger and firmer, making them better suited for dishes like chili and bean salads.

Is it true that kidney beans must be cooked thoroughly?

Yes, this is critically important. Raw and undercooked kidney beans contain phytohemagglutinin, a lectin that can cause severe nausea, vomiting, and diarrhea even in small amounts. Dried kidney beans should be soaked for at least 5 hours, then boiled vigorously for at least 10 minutes before simmering until tender. Canned kidney beans are pre-cooked and safe to eat directly.

How much protein do kidney beans provide?

One cup of cooked kidney beans provides approximately 15.3 grams of protein, making them a substantial plant-based protein source. Like other beans, kidney beans are low in the amino acid methionine but rich in lysine, so pairing them with grains creates a complete amino acid profile. This protein content is roughly equivalent to two large eggs.

Are kidney beans good for chili?

Kidney beans are one of the most popular beans for chili, and for good reason. Their firm texture holds up well during long simmering times, and their large size provides a satisfying bite. They also absorb the flavors of spices and broth beautifully, while contributing a significant amount of protein and fiber that makes chili a complete, filling meal.

How much iron is in kidney beans?

A cup of cooked kidney beans contains about 3.9 mg of iron, which covers roughly 22% of the daily recommended intake for adults. This is non-heme iron, which is not absorbed as efficiently as the heme iron found in meat. Eating kidney beans with a source of vitamin C — such as tomatoes in chili or a squeeze of lime — can significantly boost iron absorption.