Why We Need Fat
Fat is as critical a component of the diet as carbohydrate, protein or water. Fat supplies our bodies with essential fatty acids that can be found only in food. These essential fatty acids help manufacture hormones and nerve cells and are important for carrying and absorbing fat-soluble vitamins A, D, E and K. Fat also helps maintain healthy skin and hair; two of the telltale signs of a lack of fat in the diet are dry, brittle hair and scaly skin.
The simple rule for rating fats is: fats that are liquid at room temperature are more unsaturated than fats that are solid at room temperature. The lower the temperature that a fat becomes solid, the less saturated it is. Wanna know more...Chapter 6 in my book tells all!

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