Circulating high-density lipoprotein (HDL) cholesterol (HDL-C) is a marker associated with cardiovascular health. Exercise is generally known to increase the HDL-C levels, and this can, in part, explain its cardioprotective effects. The authors present data regarding the association between exercise and the HDL quality and further encourages taking into consideration the view of HDL quality in relation to exercise, in addition to HDL-C. In contrast, this book also includes research on low density lipoproteins, specifically describing research in which atherogenic LDL possesses numerous alterations of carbohydrate and human blood plasma and represents a cascade of successive changes in the lipoprotein particle. Lastly, arachidonic acid has shown to effect blood lipid levels. The authors of this book focused on the problem of arachidonic acid metabolism, belonging to the group of n-6.