As part of the study, researchers introduced two successive interventions to improve healthy eating during the same academic year in an inner city school in Cincinnati that had 297 children. During the first intervention, green smiley faced emoticons were posted near the four most healthful foods: fruits, vegetables, plain white fat-free milk and an entree with whole grains. Three months later, researchers introduced the concept of “Power Plate,” which consisted of the four healthy foods. Students who selected the Power Plate could receive a small prize, such as a sticker, temporary tattoo or mini beach ball.
Based on the researchers’ findings, students’ purchases of plain white fat-free milk increased to 48 percent of total milk sales from 7.4 percent, while chocolate milk sales decreased to 44.6 percent from 86.5 percent of total milk sales. The total amount of milk purchased remained constant from baseline to the end of the study.
Selection of fruits increased by about 20 percent during the course of the study, to 1.2 items per day from 1. Vegetable selection increased 62 percent to 1.2 items per day from 0.74 items.
Over a three-month period, the number of students opting for a Power Plate increased 335 percent, the researchers said.
“It looks like we found a very promising, low-cost and effective way of improving the nutrition of elementary school children,” said Robert Siegel, MD, medical director of the Center for Better Health and Nutrition of the Heart Institute at Cincinnati Children’s Hospital Medical Center, and lead author of the study. “This type of program may be a useful component in schools trying to improve the nutrition and health of their students.”
The study was supported by the Heart Institute and Population Health Team of Cincinnati Children’s Hospital Medical Center.