If you are successful in eliminating nearly all sources of fat, you will be cutting out all forms of meats, most grains and beans, even some fruits and vegetables. Such a diet would be very unhealthy because it would eliminate some very important nutrients. When this happens, they become convinced that they can never lose weight or control blood fats. Be cautious in using low fat products because they often are high in calories. Margarine is better than butter.
Butter contains large amounts of saturated fat and raises blood cholesterol more than any other fat.
For this reason, it is not the best choice for general use in cooking and for spreads. Trans fatty acids may also increase the LDL, or harmful form of cholesterol, in the blood. Use liquid vegetable oils, such as olive or canola oil, for cooking, baking, and salad dressings. Avoid using butter for cooking and spreading, except for the very few recipes where its taste is important to you. Choose a margarine spread that is made primarily from liquid vegetable oils and is low in saturated fat.