As if nutrition advice isn’t confusing enough, there’s a new dietary trend that focuses more on the health of our planet than on the health of our bodies.

Called “sustain­able nut­rition,” it’s the idea that our food choices can im­­pact the en­vironment.

Maybe you’ve heard claims that you can reverse climate change by eating less meat. Environmental and animal rights activists blame cattle emissions — or to put it bluntly, cow farts — for climate change. That’s because cows emit methane, a greenhouse gas linked to global ...