How Food Works

We all know about the common fats that different foods contain. Meat contains animalfat. Most breads and pastries contain vegetable oils, shortening or lard. Deep fried foods are cooked in heated oils. Fats are greasy and slick.

You commonly hear abouttwo kinds of fats:saturatedandunsaturated. Saturated fats are normally solid at room temperature, while unsaturated fats are liquid at room temperature. Vegetable oils are the best examples of unsaturated fats, while lard and shortening (along with the animal fat you see in raw meat) are saturated fats. However, most fats contain a mixture. For example, above you see the label from a bottle ofolive oil. It contains both saturated and unsaturated fats, but the saturated fats are dissolved in the unsaturated fats. To separate them, you can put olive oil in therefrigerator. The saturated fats will solidify and the unsaturated fats will remain liquid. You can see that the olive oil bottler even chose to further distinguish the unsaturated fats betweenpolyunsaturatedandmonounsaturated. Unsaturated fats are currently thought to be more healthy than saturated fats, and monounsaturated fats (as found in olive oil and peanut oil) are thought to be healthier than polyunsaturated fats.

Fats that you eat enter the digestive system and meet with anenzymecalledlipase. Lipase breaks the fat into its parts: glycerol and fatty acids. These components are then reassembled intotriglyceridesfor transport in the bloodstream. Muscle cells and fat (adipose) cells absorb the triglycerides either to store them or to burn them as fuel.

You need to eat fat for several reasons:

For more information about fat in the diet, check out thelinksat the end of this article.