This is the first year ever that the USDA has embraced a vegetarian diet. In its 2010 dietary pyramid, the USDA gave vegetarianism an outright endorsement saying in addition to improved heart health, a vegetarian diet was associated with lower rates of obesity. Another study in 2009 by Oxford researcher Tim Key found that vegetarians and vegans had body weights 3 percent to 20 percent lower than meat eaters.

Keep reading and discover why are vegetarians and vegans thinner.