Michael Twitty was leading a conversation on African diasporic food when the woman he was speaking to broke into tears. Twitty, a food writer, historian, and historical interpreter, had just explained that the word for “eat” in Wolof, a West African language, is nyam. The woman, a Massachusetts resident from an African-American and Puerto Rican family, had a lingering memory of her mother and grandmother repeating the word “nyam” during meals. But she never knew that the word was a direct connection to Africa. For Twitty, who has devoted his…