Many individuals consume far too many of their calories as fats. However, "essential fatty acids" are essential to optimal health. This group includes two fatty acids, namely linoleic acid and alpha-linolenic acid, which appear to have vitamin-like activity: they are essential for metabolism and cannot be produced in the body from simpler molecules. In addition, gamma-linolenic acid (GLA) is a fatty acid intermediate which may help some individuals bypass a "weak link" in fatty acid metabolism (delta-6-desaturase), so it can be classified as "semi-essential.
A certain amount of fat in the diet acts as the ignition for burning calories and maintenance of the metabolic processes. It also helps to give you that "satisfied" feeling when you have completed a meal. Nutritionists term this as satiety – the feeling of fullness. Foods with minimal nutritive value or what is know as "empty calories" leave you still craving food, even though you may have consumed many calories. No one can maintain a diet when they are constantly feeling deprived.
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