City Harvest helps feed the city's hungry. It also teaches children to cook and eat healthily. "When you can sum up an organization is a few words, you know it has a worthy mission," a vice chairman of City Harvest, Michael Young, said yesterday at the nonprofit's annual On Your Plate luncheon, which raised $2 million. The women gathered, meanwhile, hung on every word of eating advice from Dr. Mehmet Oz. Summed up in a few words, he said to eat vegetables, fiber, and avoid empty calories.