New kinds of burgers made from plants, with the look, taste, smell and “mouth-feel” of real meat, are showing up in mainstream restaurants and grocery stores. They reportedly pass taste tests, even among die-hard carnivores, but are they healthy? Current levels of meat consumption are unhealthy as well as environmentally unsustainable. An international commission of leading scientists assembled by the prestigious medical journal, The Lancet, concluded that, “The current global food system is unsustainable and requires an agricultural revolution …” if we hope to feed all ten billion people projected to inhabit the earth by 2050.  According to the Commission, cutting back on red meat production is an essential part of this revolution.  A major consumer of land and water, and a major producer of greenhouse gas emissions, red meat, they say, should be limited to half an ounce per person per day, and other animal proteins should be reduced in our diets as well. Ente…