Maybe you already believe in the idea that “you are what you eat.” Now, a powerful new study takes that a step further, suggesting that the health of our planet is also what we eat. In this new study, scientists calculated that eating more plant-based foods—and less meat—could reduce food-related greenhouse gas emissions 29 to 70 percent by the year 2050, as well as reduce mortality around the world between 6 and 10 percent. That…