Patna: Red kidney beans, commonly known as rajma, may offer a range of health benefits, including support for weight loss and improved heart function, nutritionists and researchers say. Rich in protein, fibre, vitamins, minerals and antioxidants, the beans have long been a staple of vegetarian diets in India and beyond.
Experts highlight that the protein and fibre content in kidney beans helps prevent the accumulation of fat and supports appetite control, while their antioxidant and anti-inflammatory properties may reduce the risk of complications associated with diabetes.
“Many people experience digestive issues such as bloating or gas after eating rajma, but these are typically the result of improper cooking or excessive consumption,” said a nutrition specialist. When prepared correctly, kidney beans can provide significant nutritional value. According to the United States Department of Agriculture, 100 grams of red kidney beans contain 7.7 grams of protein, 21.5 grams of carbohydrates, 5.4 grams of fibre, 46 mg of calcium, 1.38 mg of iron, 215 mg of potassium and 123 calories. They also supply 130 mcg of folate and 45 mg of magnesium.
Health Benefits
- Weight Management: Low in fat yet high in protein and fibre, kidney beans can help maintain a feeling of fullness and boost metabolism. Studies suggest that they may be particularly beneficial for short-term weight loss.
- Blood Sugar Control: With a low glycaemic index, kidney beans release sugar gradually into the bloodstream, making them suitable for people with type 2 diabetes.
- Heart Health: High levels of potassium and magnesium in kidney beans can help regulate blood pressure and lower the risk of cardiovascular disease.
- Digestive Health: The fibre content improves gut health, prevents constipation and supports beneficial gut bacteria.
- Cancer Prevention: Kidney beans contain polyphenols, flavonoids, lignans and other plant compounds, which studies suggest may protect against certain cancers, including stomach and kidney cancers.
- Brain Function: B vitamins, folate and magnesium support cognitive function and mood, while folate and iron aid red blood cell production and oxygen delivery to the brain.
- Bone Health: Calcium and magnesium in kidney beans strengthen bones and help prevent osteoporosis. Experts recommend consuming half to one cup daily, soaked for eight hours and thoroughly cooked.
Potential Risks
Despite their benefits, kidney beans carry some risks if consumed improperly. Raw or undercooked beans contain phytohaemagglutinin, a toxin that can cause nausea, vomiting and diarrhoea. They also contain oligosaccharides, which may trigger gas and bloating, and phytic acid and lectins, which can inhibit mineral absorption if eaten in large quantities over time. In rare cases, kidney beans can provoke allergic reactions, and oxalates in the beans may contribute to kidney stone formation.
Nutritionists stress that the advantages of kidney beans far outweigh the risks when they are soaked, cooked thoroughly, and consumed in moderation, making them a valuable addition to a balanced diet.
