Technical Abstract: Food products from animals that graze grasslands and consume diets high in forages are often better for human health than livestock fed diets with forages and concentrates. Meat from livestock that graze pastures in the United States frequently has less fat and higher concentrations of omega-3 fatty acids (FA), conjugated linoleic acid (CLA), and vitamin E than animals fed diets primarily based on grains. Similarly in various studies, dairy cattle that grazed pastures and consumed diets high in forages produced milk that had 1.3 to 3.8 higher concentrations of the omega-3 FA alpha-linolenic acid, and 2 to 3 times higher CLA concentrations than when cows were fed concentrated and conserved forages. Further, chickens that foraged on pasture produced eggs with almost 3 fold more omega-3 FA and significantly more fat-soluble vitamins than poultry fed typical grain-based diets. These differences appear to be due to the nutritional qualities of the livestock diets. Grassland plant tissues are primarily photosynthetic tissues with chloroplasts that contain a high proportion the unsaturated fatty acids linoleic and alpha linolenic acid. Further, plants that are grazed, rather than dried for hay or ensiled, have higher concentrations of carotenoids and vitamin E than most conserved forages and grain crops that are fed to livestock.