Are Kidney Beans Good for Constipation?

Yes, kidney beans may help constipation when eaten as part of a diet with enough fluid because their fiber adds bulk and helps stool move through the bowel. Direct evidence is limited, though: a small trial of white kidney bean extract did not find an effect on stool habits. Eat kidney beans fully cooked, and add them gradually to limit gas and bloating.

Kidney beans are one option among the best foods for constipation, but they are not a guaranteed or immediate remedy.

When can kidney beans help constipation?

Kidney beans may be most useful when your usual diet is low in fiber. Adding them to meals can increase fiber intake, which may make stools easier to pass over time.

The effect varies. Constipation has many possible causes, including medications and certain medical conditions, so adding kidney beans alone may not address the cause. If you already eat plenty of fiber, adding more may not help and could make bloating worse.

How do kidney beans work for constipation?

Kidney beans contain dietary fiber, including soluble and insoluble fiber. Fiber is not fully digested: some absorbs water, while some adds bulk to stool. These effects can help bowel movements become more regular for some people.

Fluid matters because fiber works best when there is enough water available in the digestive tract. Plain water is a practical choice; the guide to the best drinks for constipation discusses other options. If you have been told to restrict fluids, follow your clinician’s advice rather than increasing your intake on your own.

Bacteria in the gut also break down some fiber. This can produce gas, especially if you add a lot of kidney beans suddenly. Increasing the amount gradually can make them more comfortable to eat.

What does the evidence show?

There is limited direct research on eating kidney beans specifically to relieve constipation. Their potential benefit is based mainly on what is known about dietary fiber, rather than trials showing that a serving of kidney beans treats constipation.

In a small randomized crossover trial of white kidney bean extract, 20 healthy adults took the extract for 1 week. Researchers found no significant effect on constipation symptoms, stool consistency or stool frequency compared with a placebo.

That study tested an extract, not cooked kidney beans, and the participants were healthy adults rather than people selected for constipation. It therefore does not establish whether eating kidney beans helps people who are constipated. An extract supplement should not be assumed to work like the whole food.

How can you use kidney beans for constipation?

Start with a small amount of thoroughly cooked kidney beans, such as a few spoonfuls added to a meal. If you tolerate them comfortably, gradually increase the amount. Pairing kidney beans with other foods you regularly eat can make them easier to include consistently.

Canned kidney beans are already cooked; drain and rinse them before adding them to a meal. For dried kidney beans, follow the package directions for soaking and boiling until fully cooked. Do not eat raw or undercooked kidney beans, and do not rely on a slow cooker alone to cook dried kidney beans: inadequate cooking can leave a naturally occurring toxin that causes illness.

Drink enough fluid for your needs unless a clinician has advised otherwise. Also pay attention to how you feel: if kidney beans cause uncomfortable gas or bloating, try a smaller amount and increase it more slowly. There is no reliable timeline for when kidney beans will help, and eating more is not necessarily better.

Who should be careful, and when should you see a doctor?

Seek urgent medical care for constipation with severe abdominal pain, vomiting, a swollen abdomen or an inability to pass gas. Black, tarry stool also needs urgent assessment. Do not try to manage possible bowel obstruction by adding more fiber.

Contact a clinician if constipation persists, is a new or unexplained change, or occurs with blood in the stool. A clinician can help identify the cause and recommend appropriate care rather than relying on a food alone.

If you have irritable bowel syndrome, kidney beans may aggravate gas and bloating. If you have kidney disease or have been advised to follow a low-fiber, low-potassium or fluid-restricted diet, ask your clinician or dietitian whether kidney beans fit your plan. Ask a pediatric clinician about persistent constipation in a child.

Some medicines, including iron supplements and certain pain medicines, can contribute to constipation. Ask the prescribing clinician or pharmacist about options; do not stop a prescribed medicine on your own.