Most plain burgers, basic chicken sandwiches, and simple biscuit-based breakfast items at major fast food chains fall in the low-to-moderate potassium range, typically between 200 and 400 mg per item. That makes them reasonable choices if you’re keeping your daily potassium under 2,000 to 2,500 mg, the range commonly recommended for people with kidney disease. The key is knowing which menu items spike well above that and which stay comfortably low.
Why Potassium Matters at the Drive-Through
Healthy kidneys filter excess potassium out of your blood without any trouble. When kidney function declines, potassium can build up and cause dangerous heart rhythm problems. Guidelines from major nephrology organizations generally recommend limiting potassium to somewhere between 2,000 and 4,000 mg per day depending on the stage of kidney disease and whether blood levels are already elevated. The Academy of Nutrition and Dietetics narrows that to under 2,400 mg daily for people with chronically high potassium levels.
At those limits, a single fast food meal that delivers 600 or 700 mg of potassium eats up a significant chunk of your daily budget. Knowing the rough potassium content of common menu items helps you plan the rest of your day without guessing.
Best Burger and Sandwich Picks
A basic single-patty hamburger or cheeseburger is one of the safest mainstream fast food choices for potassium. A standard McDonald’s cheeseburger, for example, contains around 200 to 250 mg. Wendy’s Jr. Cheeseburger and Burger King’s Hamburger land in a similar range. The potassium climbs when you add extra patties, bacon, or large amounts of tomato and lettuce, but a plain or lightly dressed single burger stays well under 300 mg.
Grilled chicken sandwiches are a bit higher, generally 300 to 450 mg depending on size and toppings. Crispy (breaded) chicken sandwiches often come in slightly lower than grilled because the breading replaces some of the chicken mass. A basic crispy chicken sandwich at most chains runs around 250 to 350 mg. Fish sandwiches, like the Filet-O-Fish, are another solid option, typically in the 200 to 300 mg range because the portion of fish is small and the breading contributes very little potassium.
Breakfast Items to Look For
Biscuit-based breakfast sandwiches are generally your best bet in the morning. A simple egg and cheese biscuit at most chains runs roughly 150 to 250 mg of potassium. Adding sausage or bacon bumps it up modestly. McDonald’s Steak, Egg, and Cheese Biscuit, which is one of the larger breakfast sandwiches, comes in at 380 mg, so simpler versions with just egg or egg and sausage will be lower.
Pancakes without syrup are relatively low in potassium (around 150 to 250 mg for a standard serving), though syrup adds very little. Hash browns are worth watching. A single small hash brown patty is only about 200 mg, but a larger portion of hash browns or home fries can push past 400 mg quickly because potatoes are naturally high in potassium. If you have the option of toast or a biscuit instead, that’s the lower-potassium swap.
Sides That Keep Potassium Low
French fries are the biggest potassium trap on any fast food menu. A medium order of fries at most chains delivers 500 to 700 mg of potassium, and a large can exceed 800 mg. That’s because potatoes are one of the most potassium-dense common foods. A small order (around 2.5 ounces) is more manageable at roughly 300 mg, but it’s still a significant portion of a restricted daily budget.
Better side options include:
- Apple slices: Available at McDonald’s and some other chains, a small bag has only about 80 to 100 mg of potassium.
- Side salad (no tomato): Iceberg and romaine lettuce are low in potassium. A small garden side salad without tomato runs about 100 to 150 mg. Tomato wedges add roughly 50 to 80 mg per portion.
- Dinner roll or biscuit: A plain roll or biscuit typically contains under 100 mg.
- White rice: Available at Taco Bell, Popeyes, and similar chains, a half-cup serving of white rice has about 30 to 50 mg.
- Coleslaw: A small serving of coleslaw at places like KFC or Popeyes runs about 100 to 150 mg.
What to Order at Specific Chains
McDonald’s
A Hamburger, Cheeseburger, McChicken, or Filet-O-Fish are all under 350 mg. Chicken McNuggets (6-piece) come in around 200 mg. Pair any of these with apple slices instead of fries and a fountain drink, and the whole meal stays under 400 mg.
Taco Bell
A basic crunchy taco has only about 150 to 180 mg of potassium. Cheese quesadillas are also relatively low. Bean burritos are higher (beans are potassium-rich), so if you’re choosing between beef and bean fillings, beef is the lower-potassium option. Avoid items loaded with guacamole, tomato, or black beans.
Chick-fil-A
The original Chick-fil-A Chicken Sandwich is around 300 mg. Chicken nuggets (8-piece) land in a similar range. Their waffle fries, like all potato-based sides, are the item to skip or limit to a small size.
Subway
A 6-inch sub on white bread with chicken, turkey, or ham and light vegetables (lettuce, cucumber, onion) typically falls between 200 and 350 mg. Avoid loading up on tomato, spinach, and avocado, which are the highest-potassium toppings in the lineup.
Drinks: Simpler Is Better
Fountain sodas are essentially potassium-free. Cola, lemon-lime soda, root beer, and diet versions all contain about 1 to 2 mg of potassium per ounce. A large 32-ounce soda has roughly 30 to 60 mg total. Lemonade is similarly low unless it’s made with real juice in large amounts. Plain water and unsweetened iced tea are also negligible.
The drinks to avoid are orange juice (nearly 500 mg per cup), milk (about 350 mg per cup), and chocolate milk. Smoothies and milkshakes can be surprisingly high because they contain milk and often banana or other high-potassium fruit. A medium fast food milkshake can deliver 500 to 700 mg of potassium. Coffee in small amounts is fine (a standard 8-ounce cup has about 100 mg), but large specialty coffee drinks with milk can add up.
Watch for Hidden Potassium Additives
One thing nutrition labels won’t always make obvious is potassium-based food additives. Potassium lactate and potassium chloride are commonly used as preservatives and flavor enhancers in processed and prepared meats, including deli turkey, ham, sausage patties, and chicken used in fast food. These additives can increase the potassium content of a meat product by 50 to 100 mg per serving compared to unprocessed versions of the same cut.
You can’t easily avoid these additives when eating out, but being aware of them explains why a fast food chicken sandwich might have more potassium than a similar portion of chicken you cook at home. It’s one more reason to keep an eye on total daily intake rather than assuming a single menu item is safe based on the raw ingredients alone.
A Simple Ordering Strategy
The pattern is straightforward: choose smaller, simpler sandwiches on white bread or biscuits. Skip or downsize the fries. Pick a fountain drink, water, or tea instead of juice or a shake. Avoid menu items built around potatoes, tomato-heavy sauces, beans, avocado, or large portions of cheese. A typical low-potassium fast food meal following these rules comes in around 300 to 500 mg, leaving room for the rest of your day.