The bottom line:  Fats will not make you fat unless they lead to excess calories.  I recommend that you learn to read labels and choose your foods wisely.  The evil villain is obesity is processed foods that are high in carbohydrates and sugar and low in fiber.  Pick fats that are from whole foods and not processes franken-oils.  If you need oil to cook with, I recommend olive oil.  Now that you know that fat is not evil, you can smartly add healthy fats your grocery cart.