Raw broccoli is a low-potassium food, with about 139 mg per half-cup serving. Cooked broccoli, however, crosses into medium-potassium territory at around 229 mg per half cup. That distinction matters if you’re tracking potassium for kidney health, because the answer depends on how you prepare it.
What Counts as “Low Potassium”
The National Kidney Foundation draws the line at 200 mg per serving. Foods below that threshold are considered lower in potassium, while those at 200 mg or above are classified as higher. The American Kidney Fund uses an even more specific three-tier system: low potassium is 150 mg or less per serving, medium potassium is 151 to 250 mg, and high potassium is anything above that.
Under both systems, a half cup of raw broccoli (139 mg) qualifies as low potassium. A half cup of cooked broccoli (229 mg) lands in the medium range by the American Kidney Fund’s scale and above the National Kidney Foundation’s 200 mg cutoff. Cooking concentrates broccoli as it shrinks, so you end up with more vegetable packed into the same measured volume.
Raw vs. Cooked: Why It Changes
When broccoli cooks, it loses water and softens, meaning a half-cup of cooked broccoli contains more actual broccoli by weight than a half-cup of raw florets. That’s why the potassium jumps from 139 mg to 229 mg for the same measured serving. You can offset this by eating a smaller portion of cooked broccoli or by boiling it in water, which leaches some potassium out into the cooking liquid (as long as you discard that liquid rather than using it in a sauce or soup).
If you’re on a potassium-restricted diet, raw broccoli in salads or with dip gives you the most volume for the least potassium. Steaming retains more potassium than boiling does, so your cooking method is worth considering.
How Broccoli Compares to Other Vegetables
Among cruciferous vegetables, broccoli sits in the middle of the pack. Here’s how common options compare per half-cup serving:
- Chinese cabbage, cooked: 316 mg
- Brussels sprouts, cooked: 247 mg
- Cauliflower, cooked: 200 mg
- Broccoli, raw: 166 mg
- Cabbage, cooked: 154 mg
- Kale: 148 mg
- Collards: 110 mg
- Raw cabbage: 86 mg
If you’re looking for the lowest-potassium cruciferous options, raw cabbage and collard greens are your best bets. Broccoli is a reasonable choice when eaten raw, but cooked Brussels sprouts and Chinese cabbage deliver noticeably more potassium per serving.
For context, truly high-potassium foods are in a different league entirely. A medium baked potato can have over 900 mg, a cup of cooked spinach tops 800 mg, and a banana has about 420 mg. Broccoli is nowhere near those numbers.
Florets vs. Stalks
You don’t need to worry about picking one part of the broccoli over another. Research confirms that broccoli stalks have nearly equivalent nutrient values to the florets, including minerals like potassium. The same holds true for vitamins and antioxidants. So whether you prefer the crunchy stalk or the softer floret tops, the potassium content per gram is essentially the same.
Fitting Broccoli Into a Kidney Diet
People with kidney disease typically aim for 2,000 to 2,500 mg of potassium per day, though your specific target depends on your lab results and your doctor’s guidance. A half cup of raw broccoli at 139 mg uses up only about 6 to 7 percent of that daily budget, making it one of the easier vegetables to fit in.
Cooked broccoli at 229 mg per half cup is still manageable, but it requires more careful accounting. If you’re eating it alongside other medium-potassium foods at the same meal, the total can add up. A practical approach is to pair cooked broccoli with genuinely low-potassium sides like white rice, pasta, or raw cabbage rather than stacking it with potatoes or tomato-based sauces.
Portion size is the real lever here. Even a medium-potassium food stays well within safe limits when you measure your servings and spread your potassium intake across the day rather than concentrating it in one meal.