Not all fats are bad. In fact, there are two fats, alpha-linolenic acid (an omega-3) and linoleic acid (an omega-6), that are essential to good health. These two FA’s are termed essential since humans cannot synthesize them on their own, and therefore must ingest them in their diets.
Now here is the key point. It is the balance or ratio of these two FA’s that determines their function. A high ratio of omega-6/omega-3 is detrimental as it promotes an inflammatory response that leads to cardiovascular disease, cancer, and autoimmune diseases. A balanced ratio of 1 to 1 omega-6/omega-3 is protective against these diseases.
Most Western diets have an omega-6/omega-3 ratio of 15/1. 100% grass-fed beef has a much healthier ratio of 1.5/1. Therefore, with grass-fed beef you are eating essential fats in the correct ratio to promote health.