Deep-sea fish is high in potassium and the anti-inflammatory omega-3 fatty acids, while kale is a high-potassium alkaline food, according to SF Gate and HealthAliciousNess.com. Spinach is another alkaline food that offers a great deal of potassium per serving, states the Acid Alkaline Association.
Deep-sea fish, such as flounder or halibut, supplies between 470 to 585 milligrams of potassium per 3.5 oz serving, as well as varying levels of omega-3 fatty acids, which are known for their anti-inflammatory properties, states SF Gate. Other fish, including crab, lobster, mussels, scallops and shrimp, contain at least 260 milligrams of potassium in a 3.5-ounce serving.
Many alkaline foods also offer potassium. For example, 100 grams of kale supplies 447 milligrams of potassium, while raw spinach, also an alkaline, supplies 558 milligrams of potassium in 100 grams, states HealthAliciousness. Sweet potatoes offer 475 milligrams of potassium per 100-gram serving.
Adults need 3,500 milligrams of potassium a day, and potassium deficiency is rare in the United States because so many foods contain some potassium, states SF Gate quoting the Encyclopedia of Human Nutrition. Sun-dried tomatoes, Swiss chard, green beans, Brussels sprouts and asparagus all contain some potassium, states HealthAliciousness. Potassium is needed to maintain electrolyte balance and energy and to regulate blood pressure.