Four ounces of white tuna canned in water (the version used in the research) provide 26 grams of protein and only 2 grams of total fat. (whfoods.com)
I've also used a can of solid white tuna fish when I've been pressed for time and I don't have another source of protein prepared. (crumbtopbaking.com)
Each 6 - ounce serving of canned light or white tuna contains 2.6 or 1.7 milligrams of iron, respectively. (healthyeating.sfgate.com)