Boston, MA - Schools collaborating with a professionally trained chef to improve the taste of healthy meals significantly increased students' fruit and vegetable consumption, according to a new study led by researchers from Harvard T.H. Chan School of Public Health. The study also found that using "choice architecture" (environmental nudges to promote healthy choices) in school cafeterias improved students' selection of fruits and vegetables, but did not increase consumption over the long-term. The study is the first to examine the long-term impact of choice architecture and chef-enhanced meals in school cafeterias on selection and consumption of healthier foods.
"The results highlight the importance of focusing on the palatability of school meals. Partnerships with chefs can lead to substantial improvements in the quality of school meals and can be an economically feasible option for schools," said lead author Juliana Cohen, research fellow in the Department of Nutrition at Harvard Chan. "Additionally, this study shows that schools should not abandon healthier foods if they are initially met with resistance by students."
The study will be published online in JAMA Pediatrics, March 23, 2015.
Some 32 million U.S students eat school meals every day; for many low-income students, up to half their daily calories come from school meals. More than 15,000 U.S. schools have implemented choice architecture methods, which encompasses techniques such as placing healthy options at the beginning of the buffet line or placing white milk in front of sugar-sweetened milk.
The researchers conducted a school-based randomized clinical trial during the 2011-2012 school year among 14 elementary and middle schools in two urban, low-income school districts in Massachusetts. Included in the study were 2,638 students in grades three through eight. The schools were randomly assigned to receive weekly training and recipe design from a professionally trained chef; some received choice architecture techniques (referred to as "smart café"); some received both; and the rest (control schools) received no intervention.
After three months of exposure to the chef intervention, students selected 8% more vegetables than students at the control schools. After seven months, students in the chef intervention were 20% more likely than control school students to choose a fruit and 30% more likely to choose a vegetable. Their consumption of these foods -- meaning how much of the selected items were actually eaten -- increased by similar percentages.
After four months, smart café students increased their vegetable selection over control students by about 17% and fruit selection by 3%, but consumption didn't improve. There was no significant change in selection or consumption of white milk over chocolate milk. The schools with combined smart café and chef intervention fared only modestly better than the schools with chef alone.
"Our study was not testing whether a local celebrity chef was good for the school lunch program. Our goal was to have a chef who could work with the whole school district to train personnel and to design more palatable recipes without increasing the cost of the meal. It was a great success and really illustrated that through persistence school-aged children can learn to like healthy whole grains, fruits, and vegetables especially if they taste good. In the end, the quality and taste of the food was much more impactful on consumption than were the effects of choice architecture," said senior author Eric Rimm, professor in the Departments of Epidemiology and Nutrition at Harvard Chan. "Schools should therefore put more effort into improving the palatability of school meals for the biggest impact on students' diets. Additionally, schools may want to consider policies that eliminate chocolate milk as choice architecture was not an effective strategy to improve white milk selection."
Chef-enhanced recipes are included in the book Let's Cook Healthy School Meals, which can be downloaded at: http://support.
This study was co-funded by a grant from Project Bread - A Fresh Approach to Ending Hunger and the Arbella Insurance Foundation. Cohen is supported by grant R25 CA 098566 from the Nutritional Epidemiology of Cancer Education and Career Development Program.
"Effects of Choice Architecture and Chef-Enhanced Meals on the Selection and Consumption of Healthier School Foods: A Randomized Clinical Trial," Juliana F.W. Cohen, Scott A. Richardson, Sarah A. Cluggish, Ellen Parker, Paul J. Catalano, Eric B. Rimm, JAMA Pediatrics, online March 23, 2015, doi: 10.1001/jamapediatrics.2014.3805.
Harvard T.H. Chan School of Public Health brings together dedicated experts from many disciplines to educate new generations of global health leaders and produce powerful ideas that improve the lives and health of people everywhere. As a community of leading scientists, educators, and students, we work together to take innovative ideas from the laboratory to people's lives--not only making scientific breakthroughs, but also working to change individual behaviors, public policies, and health care practices. Each year, more than 400 faculty members at Harvard Chan teach 1,000-plus full-time students from around the world and train thousands more through online and executive education courses. Founded in 1913 as the Harvard-MIT School of Health Officers, the School is recognized as America's oldest professional training program in public health.