Research has shown that grass-fed meat contains at least twice as many omega-3 fats than grain-fed beef, maybe even up to six times as much. Omega-3 fatty acids effectively prevent and treat various diseases, including stroke, heart disease, and autoimmune reactions like eczema and lupus and rheumatoid arthritis, and various other diseases. Grass-fed meat has more antioxidants than beef fed with grain–antioxidants that protect cells from damage that could lead to serious illnesses like Alzheimer's disease and cancer.