A summary of fats, where they're found and what they do to you.
Saturated
 -Animal fats like read meat and chicken fat and skin.  Butter, cheese and other high-fat dairy products, palm and coconut oil
 -Raises LDL cholesterol levels, increases risk of heart disease, and  may increase risk of colon and prostate cancer.
 
Trans Fatty Acid
 -French fries and other deep fried food, stick margarine, shortening, packaged  cookies and crackers, processed snacks and sweets.  
 -Raises  LDL cholesterol levels, Lowers HDL levels, increases risk of heart disease, and may increase risk of breast cancer
 
Monounsaturated
 -Olive, canola, and safflower oils, also avocados, olives, peanut butter (without added trans fatty acids), many kinds of nuts including almonds, cashews, pecans, pistachios.  
 -Lowers LDL levels, may help to reduce blood pressure and lower risk of developing cardiovascular disease, stroke and some cancers.  
 
Omega-3 Fatty Acids
 -Fatty fish such as salmon, white albacore tuna, mackerel, anchovies, sardines.  Small amounts in walnut, flaxseed, canola and soybean oils.  Dark green leafy vegetables.  
 -Reduces blood clotting and inflammation which both contribute to heart attacks and strokes.  May reduce risk of some cancers. 
 
Omega-6 Fatty Acids
 -Corn, soybean and cottonseed oils. These are often found in mayonnaise, margarine and salad dressings.  
 -Lowers LDL levels, however, they may also lower HDL levels as well.  May reduce risk of heart disease.