Potassium helps your body balance fluids and supports normal heart and muscle function, and eating more of it, alongside less salt, can help lower blood pressure in people with hypertension. The best sources are everyday foods: potatoes, squash, beans, lentils, tomatoes, bananas, avocado, leafy greens, yogurt and fish. You can hit your needs without dairy, and for most healthy people food is the right route, not supplements.
What potassium does
The NHS describes potassium as a mineral that helps control the balance of fluids in the body and helps the heart muscle work properly. It works in partnership with sodium, which is why the two are usually discussed together. A diet high in salty, processed foods and low in fruits and vegetables tips that balance the wrong way.
Blood pressure
A systematic review and meta-analysis in the BMJ found high-quality evidence that increased potassium intake reduces blood pressure in people with hypertension, with no significant adverse effect on kidney function or blood lipids in the adults studied. Higher potassium intake was also associated with a lower risk of stroke. The effect on blood pressure was seen in people with hypertension, not in those without it.
Potassium is one piece of the picture. The NHS lists lifestyle changes that help lower blood pressure: a healthy, balanced diet, regular exercise, losing weight if you are overweight, and not eating too much salt. It also advises against drinking too much alcohol or caffeine, and skipping alcohol entirely makes this easier.
What about bloating?
“Bloat” can mean gas from digestion or a puffy, water-retained feeling. Potassium-rich whole foods won’t fix digestive gas, but cutting back on very salty meals and eating more produce supports a healthier fluid balance, which is a sensible first step if you often feel puffy after salty meals. If you are adding a lot of beans, increase them gradually and drink plenty of fluids so the extra fibre doesn’t cause the very gas you are trying to avoid.
Top potassium foods
Dietitians of Canada’s Unlock Food lists these as good sources:
| Food | Serving | Potassium (mg) |
|---|---|---|
| Tomato paste | ¼ cup (60 mL) | 658 |
| Potato, baked | 1 (12 × 6 cm) | 610 |
| Pinto or kidney beans | ¾ cup (175 mL) | 566 to 591 |
| Lentils | ¾ cup (175 mL) | 579 |
| Avocado | ½ whole | 487 |
| Squash, baked | ½ cup (125 mL) | 473 |
| Banana | 1 medium | 422 |
| Papaya | ½ medium | 392 |
| Chickpeas | ¾ cup (175 mL) | 378 |
| Yogurt | ¾ cup (175 g) | 362 |
| Fish | 75 g (2½ oz) | 313 |
Unlock Food notes that most Canadians get enough potassium when they make choices based on Canada’s Food Guide. The real-world gap is usually a diet that leans on packaged foods with few vegetables, fruits and legumes.
Beans and lentils: the overachievers
Three-quarters of a cup of lentils or kidney beans brings close to 600 mg of potassium, plus protein and fibre that keep you full. Easy ways to use them:
- Stir lentils into tomato pasta sauce (two potassium sources in one).
- Mash white beans with lemon and garlic as a sandwich spread.
- Add kidney or pinto beans to chili, soups and grain bowls.
- Roast chickpeas for a crunchy snack.
Canned beans are convenient. Choose “no salt added” when you can, or drain and rinse regular canned beans to remove some of the sodium.
Dairy-free options
Yogurt and milk contribute potassium, but you don’t need dairy to meet your needs. Dairy-free choices include:
- Fortified soy beverage and soy yogurt (check labels; amounts vary by brand)
- Edamame and tofu
- Beans, lentils and chickpeas
- Potatoes and sweet potatoes with the skin
- Winter squash, tomatoes and tomato sauce
- Bananas, oranges, papaya, kiwi and dried apricots
- Spinach, Swiss chard and other leafy greens
- Avocado, nuts and seeds
A potassium-rich day, dairy-free
| Meal | Example |
|---|---|
| Breakfast | Oats cooked in fortified soy beverage, topped with sliced banana and pumpkin seeds |
| Lunch | Lentil and vegetable soup with a side of whole grain bread and an orange |
| Snack | Edamame or a handful of dried apricots with almonds |
| Dinner | Baked salmon or tofu, a baked potato with skin, roasted squash and a spinach salad with avocado |
| Drinks | Water, sparkling water, a glass of orange juice or a fruit smoothie |
Cut sodium at the same time
Adding potassium works best when you also bring sodium down:
- Cook at home more often, so you control the salt.
- Season with lemon, vinegar, garlic, herbs and spices before reaching for the salt shaker.
- Compare labels on bread, soup, sauces and deli foods, which are common hidden sources.
- Use frozen vegetables without added sauces. Plain frozen produce is a convenient potassium source.
- Bake or roast potatoes and sweet potatoes with the skin on instead of buying salted fries or chips.
For produce-heavy meals the whole family will eat, try our big salad nights, and for more fluid-friendly foods, see hydrating foods beyond plain water.
When to check with a professional
More potassium is not right for everyone. Unlock Food states that healthy individuals do not need a potassium supplement unless a doctor recommends it, and that it is best to get potassium from food rather than from potassium-based salt substitutes. Talk to your doctor, pharmacist or a dietitian before increasing potassium if you:
- Have kidney disease or reduced kidney function
- Take blood pressure medicines (some raise potassium levels), diuretics or other heart medications
- Have been told to limit potassium in the past
- Are considering a potassium supplement or a salt substitute
If you have high blood pressure, keep your regular check-ins and don’t change medications on your own.
Quick takeaways
- Potassium supports fluid balance and heart function, and more of it can lower blood pressure in people with hypertension.
- Beans, lentils, potatoes, squash, tomatoes, bananas, avocado and greens are top sources.
- You can meet your needs without dairy.
- Pair more potassium with less salt for the biggest benefit.
- Check with a professional first if you have kidney issues or take blood pressure medication.
FAQ
Are frozen and canned produce as good as fresh?
They are convenient, budget-friendly ways to eat more produce. Plain frozen vegetables and fruit have no added salt or sugar. For canned vegetables, choose “no salt added” versions, or drain and rinse them.
Do I need bananas every day?
No. Bananas are a good source, but per serving, potatoes, beans, lentils, squash and tomato paste provide as much or more. Variety matters more than any single food.
Should I track my potassium?
Most people don’t need to. If your plate is half vegetables and fruit, you include legumes several times a week and you keep salty processed foods in check, you are doing the important part. People with kidney disease or on certain medicines may be asked to track it by their care team.