Tuna is a great source of the protein that our bodies need. In fact, most cans average a full 39 grams of the stuff. Often less than $1 a can, a little tuna is sure to help both your body and your wallet. Not to mention with the dosage of omerga-3s found in most fish products, there's the possibility that you may even increase your intelligence by eating this food! Tuna is fuel for our minds, our bodies, and our bank accounts.