A New York Times article out today highlights a 3-decade nutrition study comparing grass-fed beef to grain-fed beef.

From the article:

Beef from grass-fed animals has lower levels of unhealthy fats and higher levels of omega-3 fatty acids, which are better for cardiovascular health. Grass-fed beef also has lower levels of dietary cholesterol and offers more vitamins A and E as well as antioxidants. The study found that meat from animals raised entirely on grass also had about twice the levels of conjugated linoleic acid, or CLA, isomers, which may have cancer fighting properties and lower the risk of diabetes and other health problems.

The study itself can be found in the latest Nutrition Journal.