Prepared foods that come in packages — such as breads, cereals, canned and frozen foods, snacks, desserts, and drinks — have a Nutrition Facts label on the package. The label states how many calories and how much saturated fat, trans fat, and other substances are in each serving. For information on how to read a Nutrition Facts label, see the Fitness and Nutrition section of womenshealth.gov.
For food that does not have a Nutrition Facts label, such as fresh salmon or a raw apple, you can use the U.S. Department of Agriculture (USDA) National Nutrient Database . This is a bit harder than using the Nutrition Facts label. But by comparing different foods you can get an idea if a food is high or low in saturated fat, sodium, and other substances.