Cabbage is not high in phosphorus. It’s one of the lowest-phosphorus vegetables you can eat, with only about 33 mg per 100 grams raw and roughly 11 mg in a cup of cooked, shredded cabbage. For context, the daily recommended intake of phosphorus for most adults is 700 mg, so even a generous serving of cabbage barely registers.
Phosphorus in Different Forms of Cabbage
Raw white (green) cabbage contains around 33 mg of phosphorus per 100 grams, with natural variation ranging from about 23 to 41 mg depending on growing conditions. Cooking reduces that number further. A full cup of boiled, drained cabbage contains just 11.25 mg of phosphorus, making it one of the most kidney-friendly vegetables available.
Sauerkraut (fermented cabbage) stays in a similar range, with about 28 mg of phosphorus per cup. The bigger concern with sauerkraut is sodium: even a low-sodium canned version delivers over 430 mg of sodium per cup, which matters more for people watching their intake than the trace phosphorus does.
How Cabbage Compares to Other Vegetables
Among cruciferous vegetables, cabbage stands out for how little phosphorus it contains. Broccoli, Brussels sprouts, and cauliflower all provide more phosphorus per serving. In fact, when nutrition researchers at the University of Illinois cataloged the mineral profiles of common cabbage-family vegetables, phosphorus wasn’t even listed as a notable nutrient in cabbage, while it was highlighted in broccoli, cauliflower, Brussels sprouts, turnips, and radishes.
Cabbage is also low in potassium, another mineral that people on restricted diets often need to limit. Alberta Health Services classifies both green and red cabbage as lower-potassium vegetables, with a half-cup serving providing less than 215 mg. This combination of low phosphorus and low potassium is why cabbage appears so frequently on kidney-friendly food lists.
Why Plant Phosphorus Matters Less Than You’d Think
Even the small amount of phosphorus in cabbage isn’t fully absorbed by your body. Phosphorus in plants is mostly bound up in a compound called phytate, which humans can’t efficiently digest. The absorption rate for phosphorus from plant and animal foods ranges from 40% to 60%. Compare that to the phosphorus additives found in processed foods like deli meats, frozen meals, and sodas, which are absorbed at rates above 90%.
So if cabbage delivers about 11 mg of phosphorus per cooked cup and your body absorbs roughly half of that, you’re looking at 5 to 6 mg of usable phosphorus. That’s essentially negligible.
Cooking Reduces Phosphorus Even Further
Boiling cabbage causes minerals, including phosphorus, to leach into the cooking water. Research on boiling times for cabbage, broccoli, and cauliflower found that minerals were progressively removed the longer the vegetables sat in boiling water. Raw white cabbage starts at about 33 mg of phosphorus per 100 grams, while boiled cabbage drops to around 19 mg per 100 grams. If you’re actively trying to minimize phosphorus intake, boiling and draining your cabbage will pull out a meaningful portion of what little phosphorus it contains.
That said, boiling also strips some beneficial nutrients like vitamin C. If phosphorus isn’t a concern for you, eating cabbage raw in salads or slaws, or cooking it briefly, preserves more of its overall nutritional value.
Who Benefits From Low-Phosphorus Foods
Most people don’t need to think about phosphorus at all. Your kidneys regulate it efficiently, and a normal diet rarely causes problems. The people who search for phosphorus content in specific foods are typically managing chronic kidney disease, where the kidneys lose the ability to filter excess phosphorus from the blood. High phosphorus levels over time can weaken bones and damage blood vessels.
For anyone on a phosphorus-restricted diet, cabbage is about as safe as vegetables get. It’s low in phosphorus, low in potassium, and what little phosphorus it does contain is poorly absorbed. The bigger phosphorus risks come from processed and packaged foods where phosphorus additives are used as preservatives, flavor enhancers, and stabilizers. A single serving of processed meat or a can of cola can deliver more bioavailable phosphorus than several cups of cabbage combined.