The main emphasis of this chapter is on lipids in the human diet, their metabolism in the healthy body and their relationship to disease processes. Lipid metabolism in other animals will be touched on, however, for two main reasons. First, a great deal of the food we eat is supplied by farm animals and the types of lipids we consume from this source are determined by the animals' own metabolism, their diets and by farming practices. Second, rigorously controlled studies of human metabolism are difficult and expensive to achieve and scientists are, therefore, frequently obliged to make inferences about the metabolic effects of lipids in man from research with experimental animals, generally laboratory rodents.
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