A single 1-ounce slice of American cheese has 96 calories, 7.39 grams of fat, 1.97 carbohydrates and 5.37 grams of protein. The same 1-ounce portion also has 368 grams of sodium and 77 grams of potassium. It contains vitamins A and C, calcium and iron.
Other types of cheese can have more or fewer calories. For example, Swiss cheese has 100 calories and 8 grams of fat per ounce. However, it is lower in sodium with just 55 grams in a serving. By contrast, feta cheese has just 80 calories in a 1-ounce serving, but has 325 grams of sodium and 4 grams of protein.