The good news: Research suggests that a new federal rule has prompted the nationâs schools to serve an extra $5.4 million worth of fruits and vegetables each day.
The bad news: The nationâs children throw about $3.8 million of that in the garbage each day.
Researchers from Brigham Young University (BYU) and Cornell observed three schools adjust to new school lunch standards that require a serving of fruits or vegetables on every studentâs tray â whether the child intends to eat it or not. As they report in the December issue of Public Health Nutrition, students discarded 70% of the extra fruits and vegetables.
âWe saw a minor increase in kids eating the items, but there are other ways to achieve the same goal that are much, much cheaper,â said BYU economics professor Joe Price.
Strange as it sounds, directly paying students to eat a fruit or vegetable is less expensive and gets better results.
With Cornellâs David Just, Price conducted a second study to measure the effect of small rewards in the lunchroom. The week-long experiments took on different twists in the 15 different schools â some could earn a nickel, others a quarter, and others a raffle ticket for a larger prize. But the results were generally the same. As the scholars report in The Journal of Human Resources, offering small rewards increased the fruit and vegetable consumption by 80%. And the amount of wasted food declined by 33%.
Which begs the question: Is benevolent bribery a better way?
âParents are often misguided about incentives,â Price said. âWe feel a sense of dirtiness about a bribe. But rewards can be really powerful if the activity creates a new skill or changes preferences.â
The case against using bribes in parenting is perhaps best articulated in Alfie Kohnâs 1999 book âPunished by Rewards.â In many scenarios, the use of rewards can crush internal motivation. With healthy eating, for example, some fear that prizes will prevent children from developing their own motivation to eat things that are good for them. Another danger, known as a boomerang effect, is the possibility that some children would eat less fruits and vegetables when the rewards disappeared.
Thatâs why Price and Just measured fruit and vegetable consumption before and after the week-long experiments. When the week of prizes ended, students went back to the same level of fruit and vegetable consumption as before â no lasting improvement, but no boomerang effect either.
Now the researchers are studying whether extending the experiments over three to five weeks might yield lasting change. So far things look promising.
âI donât think we should give incentives such a bad rap,â Price said. âThey should be considered part of a set of tools we can use.â
The first study documenting the impact of the new rule appears in the December 2013 issue of Public Health Nutrition. The second study is titled âUsing Incentives to Encourage Healthy Eating in Childrenâ and is available to subscribers of The Journal of Human Resources. An earlier version of the paper is available at Priceâs website.
Source: Brigham Young University press release