Grass-fed meat, or the meat from wild animals (such as venison or elk), often has less fat and is thus harder to chew. That's the primary reason why many cattle farmers feed their cows grains instead of grass. It fattens up the animals quicker and improves the taste. Unfortunately, feeding cows an unnatural diet (grains) leads to damaged fatty acids, a higher ratio of inflammatory omega-6 to anti-inflammatory omega-3 fatty acids, and other problems. That's why I recommend buying only grass-fed meat.