Reducing the Potassium in Legumes
Did you know that you can drastically reduce the quantity of potassium in legumes? Indeed, according to a study, it is possible to prepare legumes (in this case chickpeas and lentils) in such a way that most potassium is eliminated.
If you have chronic kidney disease, you certainly know that what you eat directly affects your health. Following your Registered Dietitian and doctor’s instructions, you may need to limit your consumption of minerals like potassium, phosphorus and sodium. If you aren’t sure, check with your kidney care team.
Traditionally, patients with a kidney disease have been advised against eating legumes. Legumes, in addition to vitamins and fibers, contain a lot of protein and minerals. Unfortunately, these minerals can be dangerous because, without proper kidney function, they accumulate in the blood, causing conditions like hyperkalemia (excess of potassium) and hyperphosphatemia (excess of phosphorus). Fortunately, a recent study has found a way for chronic kidney disease patients to safely enjoy legumes like chickpeas and lentils (Martínez-Pineda, 2019).
There are 3 easy steps for the preparation of dried chick peas and lentils:
- Let the legumes soak in a bowl of water for 12 hours or more (do it before your bedtime!).
- Discard the soaking water (now full of potassium) and rinse the legumes well.
- Cook them in a pressure cooker or boil in lots of fresh water.
Note: When using canned chickpeas or lentils, the initial quantity of potassium and phosphorus is already fairly low. Soaking will reduce the potassium even futher but isn’t necessary for most people. Make sure to choose canned chickpeas and lentils without salt or rinse before using. If you are using dried legumes, it is necessary to cook them after soaking to achieve a low potassium level.
But what about phosphorus? Phosphorus is not as soluble as potassium, so it is not leached out of the legume during the soaking process like potassium is. Despite this, it has recently been demonstrated that phosphorus from legumes are poorly absorbed.
Check out our featured recipe Red Lentil Dahl to try this cooking method for a delicious, savoury recipe.
Submitted by Camélia Taklit – Edited by June Martin, RD, CDE Grand River Hospital
 Martínez-Pineda, Montserrat, et al. “Cooking Legumes: A Way for Their Inclusion in the Renal Patient Diet.” Journal of Renal Nutrition 29.2 (2019): 118-125.