There are several types of dietary fat. Some fats are unhealthy, such as trans fat, found in packaged foods, and saturated fat, found in red meat and whole-fat dairy. Some fats are healthy, including polyunsaturated and monounsaturated fat. Monounsaturated fat is found in most nuts, avocados, and many oils, such as olive, peanut, and canola. Polyunsaturated fats come in two forms: omega-3 fatty acids, found in salmon, mackerel, sardines, and flaxseeds; and omega-6 fatty acids, found in corn oil, soybean oil, walnuts, and safflower oil.
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