Often, that means cutting back on potassium.
Healthy adults need about 4,700 to 5,100 milligrams of potassium each day. Someone on a potassium-restricted diet might only be allowed about 2,000 milligrams per day.
Potassium is in many foods. Some fruits, vegetables, and legumes have a lot of it. It’s also in dairy, meat, fish, and chicken.
Your doctor will likely recommend that you focus on fruits and vegetables that are lower in potassium and limit portion sizes if you eat foods rich in potassium. The goal is to find a balance because getting too little potassium can also cause problems.
Foods High in Potassium
One of the top food sources of potassium may surprise you: dried apricots. Just half a cup has 1,000 milligrams of potassium. Other dried fruits are also rich in potassium. You’ll get 700 milligrams from half a cup of prunes and 618 milligrams from half a cup of raisins.
And while beans and legumes are great for you, some are high in potassium. A cup of cooked lentils gives you 731 milligrams of potassium. And a cup of canned kidney beans delivers 607 milligrams of potassium.
Veggies are good for everyone, but if you’re on a potassium-restricted diet, your doctor may want you to limit certain ones, such as acorn squash (644 milligrams in a cup of mashed acorn squash), potatoes (610 milligrams in a medium-sized baked potato), and spinach (344 milligrams in 2 cups of raw spinach).
Potassium isn’t just in plant-based foods. You’ll get 332 milligrams of it in 3 ounces of chicken breast, 330 milligrams from nonfat yogurt, and 326 milligrams from 3 ounces of salmon.
Even tea has potassium. And if you use a salt substitute, potassium may be in it.
Your doctor or nutritionist should give you a full list of the foods to limit and what to eat instead.
How to Reduce Potassium in Foods
You can lower potassium levels in canned foods before you eat them. One way to do this is to drain canned fruits, vegetables, and meats before you eat them and throw out the liquid.
Another way is to “leach” vegetables that are higher in potassium to pull out some of the potassium. To do that, soak the vegetables first, cook them in a lot of water (use 10 times more water than the vegetables), and then rinse the cooked veggies in cold water.
Work With a Dietitian or Nutritionist
Your doctor may refer you to a registered dietitian or nutritionist to help you manage your potassium levels.
A nutritionist will take a close look at what you normally eat and drink and recommend a low-potassium meal plan filled with the nutrients you need.
He or she can also help you avoid hidden sources of potassium. These include additives in preserved foods and low-sodium, potassium-based salt substitutes.