Red kidney beans have a diuretic effect making them useful for reducing swelling & oedema. A good vegetarian source of iron & contain slow releasing carbohydrates. Red kidney beans have the following benefits n n These have a diuretic effect making them useful for reducing swelling & oedema. n They are a good vegetarian source of iron needed for energy & growth. n They are a good source of virtually fat free protein. n They contain slow releasing carbohydrates that keep blood sugar & energ