An estimated 179 calories is in a single can of light tuna stored in water. Calorie content can vary by brand, can size and if the tuna is stored in water or oil.
Canned tuna is relatively high in sodium and has an average of 558 milligrams per 5.8 ounce can. Tuna contains zero carbohydrates and less than 2 grams of fat.
Canned tuna has been on the market since 1903 and is a top-selling variety of canned meat. The majority of canned tuna is used for sandwiches, but tuna is also included in casseroles and salad recipes. Tuna is an excellent source of potassium and protein.