It is a common belief that fats make one fat but it is not true. All fats are not bad; in fact some facts are essentially required by the body. Such fats are called good fats. Good fats are a good source of energy, they are building blocks of cell membranes and they help in vitamin and mineral absorption. Bad fats are also called trans-fats; these are carcinogenic. The hydrogenated foods contain fats that increase bad cholesterol in blood. This can clog arteries and increase insulin resistance which can lead to diabetes. The oils which do not contain bad fats include; sesame oil, sunflower oil and virgin olive oil.