Answer:
Saturated fatty acids have no double bonds between carbon atoms, hydrogen bonds instead forming these bonds.
Polyunsaturated fats have more than one bond left available for hydrogen. In cooking oils, hydrogenation increases the number of hydrogen bonds in relation to the double carbon bonds.
Saturated fats are solid at room temperature. They are mainly animal fats such as beef, pork and chicken and in animal products such as milk, butter, cheese and eggs. Too much of these fats can collect along the walls of your blood vessels. This can lead to heart disease, and a poor profile of the bad fat and cholesterol in the blood.
Unsaturated fats are liquid at room temperature. These are mainly plant fats such as corn, safflower, olive, walnut, canola and others. These fats can help clean the blood vessels. However, too much of some of these fats can lead to heart disease. Other unsaturated fats, called omega-3 fatty acids can help clear out the blood vessels and also help with brain function and eye function.