Abebe, the owner of Abyssinia, a popular Ethiopian eatery in Nairobi, Kenya, shows some of the foods permitted during the pre-Christmas fast. Orthodox Ethiopians typically eat just one vegan meal per day for 40 days before the Christmas feast on Jan. 7. Gregory Warner/NPR hide caption

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Mixed martial arts fighter Cornell Ward (from left), chef Daniel Strong, triathlete Dominic Thompson, lifestyle blogger Joshua Katcher and competitive bodybuilder Giacomo Marchese at a vegan barbecue in Brooklyn, N.Y. Courtesy of James Koroni hide caption

itoggle caption Courtesy of James Koroni

Suzy Amis Cameron, wife of director James Cameron, and gardener and educator Paul Hudak inspect seedlings in the MUSE School CA greenhouse in Calabasas, Calif. Amis Cameron, who founded the school with her sister, wants the school menu to be entirely plant-based by fall 2015. Eliza Barclay/NPR hide caption

itoggle caption Eliza Barclay/NPR

You'll know you've gotten somewhere on the long and winding road to veganism when the greenery you see along the way starts to look seductively delicious. iStockphoto.com hide caption

itoggle caption iStockphoto.com

A salad of sunflower sprouts, grapefruit, and avocado waits to be served and eaten at a party in Washington, D.C. Brendan Hoffman/Getty Images for Girl Behind The Camera hide caption

itoggle caption Brendan Hoffman/Getty Images for Girl Behind The Camera