Question: is tuna high in protein?
Answer: Tuna. Tuna is very low in calories and fat, which makes it an almost pure-protein food. Three ounces (85 grams) of cooked yellowfin tuna packs about 25 grams of protein and only 110 calories ( 14 ). It's also a good source of B-vitamins, plus minerals like magnesium, phosphorus, and potassium.