A dietitian explains why rinsing canned beans actually matters

Introduction

You're standing at the counter with a can of black beans, dinner half-started, and that familiar question hits: should I rinse these or just dump them straight into the pot? The thick, cloudy liquid clings to the beans as you pop the lid, and for a split second, you wonder if you're overthinking something so small. Turns out, that murky stuff swirling around your chickpeas isn't just harmless bean juice—and what you do with it can actually change your meal in ways you might not expect.

Why that liquid deserves a closer look

The viscous liquid in canned beans—officially called aquafaba—contains more than water. It's loaded with dissolved starches, proteins, salt, and oligosaccharides (complex sugars that our bodies struggle to break down). While some recipes celebrate aquafaba as a vegan egg substitute, keeping it around for your weeknight chili or grain bowl introduces extra sodium you probably didn't account for. Most canned beans pack 300–400 milligrams of sodium per half-cup serving, and a significant chunk of that lives in the liquid, not the beans themselves.

Nutritionally speaking, rinsing matters. Studies show that a quick rinse under cold water can slash sodium content by 36–41%, depending on the brand and bean variety. For anyone watching their salt intake—or just trying to control the seasoning in their dish—that's the difference between a balanced meal and something that tastes like it came straight from the ocean.

What happens when you skip the rinse

Beyond the salt, there's the digestive factor. Those oligosaccharides cause gas and bloating for many people, and they're concentrated in the canning liquid. If you've ever felt uncomfortably full after a bean-heavy meal, this might be why. Rinsing removes a good portion of these compounds, making beans gentler on your stomach without losing the fiber and protein that make them nutritious in the first place.

The texture changes, too. Unrinsed beans come with a starchy, slightly slimy coating that can make dishes feel heavier or muddier than intended. In a fresh salad or grain bowl, that coating dulls the brightness of other ingredients. Even in soups or stews where you want body, starting with rinsed beans gives you more control—you can always add your own stock or starch to thicken things exactly how you want.

When the liquid actually helps

Here's the exception: when you're making something that needs thickening or emulsifying, that canning liquid can work in your favor. Aquafaba whips into stiff peaks for vegan meringues and mousses, and the starch helps bind veggie burgers or adds body to hummus. Some traditional recipes, like certain Italian soups, specifically call for the bean liquid to create a creamy, cohesive texture without added cream.

If you're making refried beans or a rustic bean stew where you want everything to meld together, keeping some of that liquid makes sense. Just know you're also keeping the sodium—adjust your seasoning accordingly, or look for low-sodium or no-salt-added canned beans if you plan to use the liquid regularly.

How to rinse properly (it takes 30 seconds)

Pop the can, dump the beans into a fine-mesh strainer, and run cold water over them for about 30 seconds, stirring gently with your hand. You'll see the water run cloudy at first, then clearer as the excess starch and salt wash away. Let them drain for a minute, give the strainer a shake, and you're done. The beans hold their shape, taste cleaner, and integrate better into whatever you're cooking.

For dishes where beans are the star—think Mediterranean salads, grain bowls, or even just beans on toast—rinsing is non-negotiable. You want the flavor of the beans themselves, not the metallic tang of can liquid. For slow-cooked dishes like chili or soup where everything simmers together for hours, rinsing still helps by giving you a blank canvas to season from scratch.

Small habit, noticeable difference

Once you start rinsing consistently, you'll notice the shift. Salads taste brighter. Soups don't need as much correction at the end. Your stomach feels lighter after lunch. It's one of those tiny kitchen habits—like salting pasta water or letting meat rest—that seems optional until it becomes second nature. And unlike complicated techniques or expensive ingredients, this one costs nothing but a few seconds at the sink.

Next time you reach for that can, take the extra moment. Your taste buds, your digestive system, and anyone watching their sodium intake will quietly thank you. Sometimes the smallest steps—literally just running water—make the biggest difference in how a meal comes together.