Because your liver is also involved in the process of metabolizing protein, if it is not functioning properly, high protein diets can cause further problems due to the added strain. When you restrict your fat intake over a long period, your body will tend to store fat easier because fat is needed for many biological functions. When it is in short supply, your body stores as much as possible for emergency times. By increasing your intake of unsaturated fat you will allow your body to release excess stores of fat. This is the stuff that clogs arteries, but impossible to cut out of your diet completely.
Saturated fats are the cause of many illnesses like heart disease, and cancer, so beware.
Since they cannot be manufactured by the body, the must be provided by your diet. Essentially, these are the only fats you will ever need. Linoleic acid is primarily found in oils like canola, sunflower and safflower. Linolenic acid is found in cold-water fish. It is also found in linseed oil.