They lower our ability to absorb fat soluble nutrients, but that is not the only problem. The fats we are eating contain fewer nutrients to start with. Most of the fat in our diet comes from animal products, and their nutrient content has been reduced by using commercial feeds.

Despite the fact that grass fed beef is lower in fat that feed red beef, its overall content of vitamin E (a fat soluble vitamin), is much higher. Grass fed beef is four times high in vitamin E than feed raised beef. It also has higher levels of B vitamins, vitamin D, iron, zinc coenzyme Q10 and olecic acid.

Higher Vitamin E in Grass Fed Beef Despite Lower Fat:
http://www.americangrassfedbeef.com...atural-beef.asp

Higher in Content of other Nutrients:
http://www.skunkhouse.com/postings/...10311b18474.pdf