“It’s the greatest feeling in the world,” said Dr. Daniel Olivero about his return to PS 18 in the South Bronx, his alma mater, on a recent mission to convince 2nd-graders — including his son — about the importance of whole-grain foods in their diets. He began the lesson, part of an initiative called the Family Health Challenge organized by the Committee of Interns and Residents/SEIU, by explaining the composition of whole grains and the importance of the fiber they contain. Dr. Olivero, who works right across the street from the school at Lincoln Hospital, noted, “Any doctor can prescribe medication. Maximizing children’s health and developmental potential is my dedication.” He was joined by Dr. Tony Tanagho of Lincoln Hospital and Dr. Wing Sze Leung and Dr. Millicent Okereke of Jacobi Hospital as part of the Family Health Challenge program to prevent the obesity epidemic plaguing so many neighborhoods. Using colorful photos of refined food and whole-grain food, they discussed with students what their daily diets included and made the case for what one student referred to as “the healthy stuff.” In a game of true and false, the students in Natalie Ayala’s and Kathleen Pangilinan’s classes needed to be convinced that brown rice would taste good; good for them they seemed to understand, but that it would taste good was another matter.