Going meatless once a week may reduce your risk of chronic preventable conditions like cancers, cardiovascular disease, and diabetes. It can also help reduce your carbon footprint and save precious resources like fresh water (the water needs of livestock are tremendous, far above those of vegetables or grains. An estimated 1,800 to 2,500 gallons of water go into a single pound of beef!) and fossil fuel (on average, about 40 calories of fossil fuel energy go into every calorie of feedlot beef in the U.S.)
If you do eat meat on other days, try grass-fed, hormone-free, locally-raised options whenever possible.