If you pound turkey cutlets and cook them like veal, it's hard to tell the difference. Fish and seafood. But several fish are fairly high in fat, including herring, mackerel, and salmon. To keep your fish low in fat, bake, broil, poach, or grill it, or pan-fry it in wine. If you enjoy high-fat fish, use small portions, and combine them with vegetables, beans, and grains.
Canned tuna comes packed in either water or high-fat oil.
Butter, margarine, oils. Butter is the most harmful because it's the highest in saturated fat, which raises cholesterol and contributes to heart disease. But margarine contains trans-fatty acids, which also increase risk of heart disease. Olive oil, a monosaturated fat, does not increase risk of heart disease, nor, according to some studies, the risk of breast or colon cancer. Use it sparingly.