There is some evidence that sustainable techniques of pasturing enable animals to eat the grasses and greens that their bodies are naturally adapted to eat, resulting in healthier animals and leaner cuts of meat. Moreover, some experts believe that since cattle are meant to eat grasses, the acidity levels in their stomachs are altered when they eat grains, making them more susceptible to bacteria and infections.
On factory farms, animals are fed corn and grains, as well as additives and byproducts to make them gain weight. As a result, factory-farmed meat can often have a high fat content. In contrast, meat from pasture-raised animals is often lower in calories, and contains a better ratio of good fats to bad fats. Even free-range poultry and eggs frequently have less fat than their factory-farmed counterparts.