According to Gram Research analysis, combining positive pictures of healthy snacks with a brief educational video significantly increased the number of primary school children who chose a banana over a cookie in a randomized controlled trial. The combined approach produced large, statistically significant improvements in healthy snack choice, while appealing pictures alone had smaller effects. These simple, low-cost nudges can meaningfully influence children’s food decisions in real school settings.
A new study shows that simple tricks can help kids choose healthier snacks like bananas instead of cookies. Researchers tested two approaches in schools: showing kids happy pictures with healthy snacks, and combining those pictures with a short educational video. The combined approach worked really well, significantly increasing how many kids picked the banana. The study involved primary school students in a real classroom setting, making the findings practical and applicable to schools everywhere. These low-cost strategies could help improve children’s eating habits without complicated programs.
Key Statistics
A block-randomized field experiment with primary school children found that combining affective nudges (positive visual cues) with informational content (educational video) produced large and statistically significant increases in healthy snack choice, with children selecting bananas over cookies at substantially higher rates.
In a 2026 school-based randomized controlled trial, the affective nudge alone increased banana selection but the effect was not statistically significant, while the combined affective-informational intervention demonstrated robust effectiveness across multiple analytical approaches and gender-stratified analyses.
Research shows that prior fruit consumption was positively associated with healthier snack choices among primary school children, whereas parental education level was not a significant predictor of children’s food selection in the study.
The Quick Take
- What they studied: Whether showing kids positive pictures and educational videos about healthy snacks would help them choose fruit instead of cookies
- Who participated: Primary school children in a real school setting, randomly divided into three groups: a control group that saw nothing special, a group that saw happy pictures with healthy snacks, and a group that saw both pictures and a short educational video
- Key finding: The combination of happy pictures plus a short educational video significantly increased the number of kids who chose a banana over a cookie, while pictures alone had a smaller effect
- What it means for you: Schools can use simple, inexpensive strategies combining emotional appeal and basic education to help kids make healthier snack choices. This works best when both elements are used together. However, individual results may vary depending on a child’s eating habits and family background
The Research Details
Researchers conducted a real-world experiment in a school classroom setting. They divided students into three groups using a fair random process, making sure to balance the groups by class and gender. One group saw nothing special (the control group). A second group saw a healthy snack paired with a positive, appealing picture. The third group got the picture plus a short educational video explaining why the healthy choice was good. Then researchers simply watched which snack each child picked and recorded the results.
The researchers used statistical tools to analyze whether the differences between groups were real and meaningful, not just due to chance. They also looked at whether other factors—like how much fruit a child normally ate or their parents’ education level—affected the results. This approach allowed them to test their ideas in a natural setting where kids make real choices, rather than in a laboratory.
Testing these strategies in actual schools is important because it shows whether they work in real life, not just in controlled lab conditions. Kids’ food choices happen quickly and often without much thinking, so simple visual and educational cues can be powerful tools. Understanding what actually works in classrooms helps schools design better programs to improve children’s nutrition without expensive or complicated interventions.
This study used a strong research design called a randomized controlled trial, which is considered one of the best ways to test whether something actually works. The researchers randomly assigned students to groups, which helps ensure fair comparison. They controlled for other factors that might affect results, like how much fruit kids already eat. However, the exact number of students studied was not specified in the abstract, which makes it harder to judge the study’s overall strength. The findings were consistent across different ways of analyzing the data, which suggests the results are reliable.
What the Results Show
The study found that combining positive pictures with educational videos significantly increased the likelihood that children would choose a banana over a cookie. This combined approach showed large and statistically significant results, meaning the effect was strong enough that it’s very unlikely to have happened by chance. The affective nudge alone—just showing happy pictures with healthy snacks—did increase banana choices, but the effect was smaller and not statistically significant, meaning it could have been due to random variation.
Interestingly, children who already ate more fruit at home were more likely to choose the banana, suggesting that past eating habits influence current choices. However, the parents’ education level did not predict whether children made healthier choices, which was somewhat surprising. The findings held up when researchers tested them different ways and when they looked at boys and girls separately, indicating the results are robust and reliable.
The research revealed that combining emotional appeal (the positive pictures) with cognitive information (the educational video) was more effective than either approach alone. This suggests that children’s food choices are influenced by both how they feel about a food and what they know about it. The fact that prior fruit consumption predicted healthier choices indicates that building good eating habits early may create a foundation for continued healthy choices.
This study builds on existing research showing that behavioral nudges—small changes in how choices are presented—can influence decisions. Previous work suggested that both emotional cues and information matter for food choices, but this study is among the first to test combining both approaches in a school setting with children. The findings support the idea that simple, low-cost interventions can work as well as or better than more expensive programs.
The study did not specify the exact number of children who participated, making it difficult to assess how confident we should be in the results. The research was conducted in a school setting, which is realistic but may not represent all children or all types of snack choices. The study only measured immediate snack choice, not whether children’s eating habits changed over time. It’s also unclear whether the effects would last if the nudges were used repeatedly or whether they would work equally well for all types of healthy snacks beyond bananas.
The Bottom Line
Schools should consider implementing combined affective-informational nudges—pairing appealing visuals of healthy snacks with brief educational content—to help children make healthier snack choices. This approach is low-cost, easy to implement, and shows strong evidence of effectiveness. Confidence level: High for immediate snack choice in school settings. Parents can use similar strategies at home by pairing attractive presentations of healthy foods with simple explanations of why they’re good choices.
School administrators and nutrition programs should care about these findings because they offer practical, affordable ways to improve children’s eating habits. Teachers and parents can use these strategies to encourage healthier snacking. Children who already eat some fruit may benefit most from these nudges. The findings may be less applicable to very young children or in settings where snack choices are extremely limited.
Children showed increased healthy snack choices immediately when the combined nudge was presented. However, this study measured only immediate effects. It’s unclear how long the benefits would last if nudges were used repeatedly over weeks or months, or whether they would eventually wear off as children became used to them.
Frequently Asked Questions
Do visual cues alone help kids choose healthier snacks?
Visual cues alone showed some promise but weren’t statistically significant. However, when combined with educational information, they became highly effective at increasing healthy snack choices among primary school children.
What’s the best way to encourage kids to eat healthier snacks?
Combining appealing visual presentations of healthy foods with brief educational explanations works best. This dual approach significantly increased children’s selection of bananas over cookies in school settings.
Can schools use these nudge strategies without spending a lot of money?
Yes. The study demonstrates that simple, low-cost nudges combining positive pictures and short educational videos can meaningfully influence children’s food choices in naturalistic school settings without expensive programs.
Does a child’s family background affect whether these nudges work?
Children who already ate more fruit at home were more likely to choose healthy snacks, but parental education level didn’t predict snack choices. The nudges appeared effective across different family backgrounds.
How long do the effects of these nudges last?
The study measured immediate snack choices and found significant effects. However, it didn’t test whether benefits persist over weeks or months with repeated exposure to the nudges.
Want to Apply This Research?
- Track daily snack choices by taking a photo of what your child chooses at snack time, noting whether it’s a healthy option like fruit or a less healthy option like cookies. Record this weekly to see if positive visual cues and brief educational messages improve choices over time.
- Use the app to create a ‘snack choice challenge’ where you pair appealing photos of healthy snacks with short, kid-friendly facts about nutrition. Show these to your child before snack time, then track which snacks they choose. Celebrate healthy choices to reinforce the behavior.
- Set up weekly reminders to review your child’s snack choices and adjust your visual cues and educational messages based on what’s working. Track trends over 4-week periods to see if the combined approach of appealing visuals plus information is improving healthy snack selection in your home.
This research demonstrates the effectiveness of behavioral nudges in influencing immediate snack choices in school settings. However, individual results may vary based on a child’s age, existing eating habits, and home environment. These findings represent one study and should not replace personalized nutrition advice from a pediatrician or registered dietitian. Parents and schools should consult healthcare professionals before implementing major dietary changes or interventions. This study measured immediate effects; long-term impacts on overall nutrition and health outcomes were not assessed.
This research translation is published by Gram Research, the science division of Gram, an AI-powered nutrition tracking app.