A friend had a birthday in May. We celebrated at a restaurant that specialized in healthy—or healthful—organic food. People used to make a distinction between the two words healthy and healthful. According to “Copyediting: A Practical Guide,” by Karen Judd, “something healthful is good for you; healthy describes your health.” But not anymore. Language changes—all the time. We ate a healthy dinner and felt good afterward. The cake was delicious.