Trans fats are considered unhealthy because they are artificial fats that are created when liquid oils are partially hydrogenated. They are commonly found in many processed and fried foods, including baked goods, fried foods, snack foods, and margarines. Trans fats raise LDL (bad) cholesterol levels and lower HDL (good) cholesterol levels, increasing the risk of heart disease. They also contribute to insulin resistance, which is a precursor to type 2 diabetes. The consumption of trans fats has been linked to an increased risk of heart disease, stroke, and other chronic health problems. Trans fats have no known health benefits and it is recommended to limit their intake as much as possible. Many countries have taken steps to regulate or ban the use of trans fats in food production.