The New Eating Behavior of Children Indicated by "Distancing from Triangular Eating" ── Insights into "Enjoyable Food Education" Through Picky Eating, Preferences, and Developmental Traits

1. Introduction: What is "Sankaku Tabe"?

"Sankaku Tabe" is a unique Japanese way of eating that balances nutrition by "seasoning in the mouth" with staple foods and side dishes. It is said to have spread in the 1970s along with the guidance to finish school meals completely.sukusuku.tokyo-np.co.jp

2. History and Changes in the Educational Field

• Post-war Nutrition Supplementation Period: Uniform school meals starting with skim milk powder.

• Period of Rapid Economic Growth: The revival of rice-based school meals and the promotion of Sankaku Tabe.

• Since Heisei: From "forced completion" to "enjoyable eating" with allergy responses and individual optimization.

• 2020s: Prioritizing "quietly finishing meals in a short time" due to silent eating and infection control, leading to a decline in Sankaku Tabe instruction.sukusuku.tokyo-np.co.jp

3. Reading "Sankaku Tabe Decline" and Picky Eating through Data

In a 2024 survey by Otsuka Pharmaceutical, 63.4% of parents reported being concerned about their children's picky eating and food aversions.sndj-web.jp


According to a university research team's report, the rate of eating only one type of dish among elementary school students increased from 14% in the late 1990s to 35% in the 2020s.cir.nii.ac.jp

4. Why Can't Sankaku Tabe Be Practiced? Six Factors

1. Sensory Sensitivity and Underdeveloped Oral Functions
   
   

2. Developmental Characteristics (ASD, ADHD, etc.)
   
   

3. Changes in Family Environment and Individual/Isolated Eating
   
   

4. One-Plate Meals and Fast Food Culture
   
   

5. Diversification of School Meal Guidance
   
   

6. Eating While Doing Other Things and Short Meal Times

It is pointed out that picky eating in children with developmental disabilities is due to their characteristics and is different from "lack of discipline."yumelabo.jp

5. Nutritional Benefits of Triangular Eating

• Suppression of Rapid Blood Sugar Spikes

• Improved Satisfaction and Prevention of Overeating

• Self-regulation of Salt and Fat Intake

• Diversification of Taste and Suppression of Picky Eating
  
  
  Dietitians explain that "eating small alternating portions makes it easier to maintain nutritional balance even if you feel full halfway through."fundely.co.jp

6. Risks of Eating Only One Type of Food

Focusing on one dish can narrow the range of taste acceptance and potentially increase the risk of obesity and lifestyle-related diseases in the future.cir.nii.ac.jp

7. Support for Children with Developmental Characteristics

• "Small Step Method" of Gradually Changing Texture, Temperature, and Color

• "Predictable Presentation" for Reassurance

• Collaboration with Specialized Professionals (OT, ST, Dietitians) in Therapeutic Education
  
  
  Even in cases where a child could only eat white foods, there have been reports of them accepting more than 10 different items within six months.kodomo-plus.co.jp

8. Five-Step Training You Can Do at Home

9. Comparison with Dining Tables Around the World

In various countries around the world, there are diverse eating behaviors such as "alternate eating" and "layered eating," all centered around the core of "enjoyment," like Korea's "banchan" culture, French course meals, and American one-plate school lunches.

10. Non-Forced Food Education—Collaboration Between Schools and Homes

The Ministry of Education's "Guidelines for Instruction on Food" (revised in 2019) clearly states that "the formation of desirable eating habits should be carried out while respecting growth stages and individuality."mext.go.jp

In practice, initiatives such as "self-serve school lunches," where children can declare disliked ingredients in advance, and "learning material plates," where they can choose how to eat, are being introduced.kanuma-school.ed.jp

11. Summary and Suggestions

The departure from "triangle eating" is not a "collapse of discipline" but a mirror reflecting social structure and the diversity of children. What adults can do is convey the experience that "eating alternately is fun" and "different flavors combined are delicious" in a safe environment where they can try again even if they fail.

In doing so,

① Do not force

② Do not compare

③ Share successful experiences

These three principles are key.

A tip you can start today is to try just a bite of "let's mix it."

List of Reference Articles

• Tokyo Shimbun Parenting Sukusuku "Is 'Triangle Eating' Really a Good Thing?" (2018-02-17)
  
  

• note Education Essay "Should 'Triangle Eating' Be Taught in Modern School Lunch Guidance?" (2025-02-20)
  
  

• Otsuka Pharmaceutical "Survey on Children's Food Education and Digital Utilization" (2024-03-05)
  
  

• CiNii Papers "The Relationship Between the Way of Eating Rice and Side Dishes and Picky Eating During Meals" (2023)
  
  

• Nagasaki University Hospital Column "Benefits of 'Triangle Eating' and 'Eating Only One Thing'" (2024-03-27)
  
  

• Yume Lab "About 'Picky Eating' in Children with Developmental Disabilities" (2024-10-15)
  
  

• Kodomo Plus "Developmental Disabilities and Food Preferences" (2025-04-10)
  
  

• Ministry of Education, Culture, Sports, Science and Technology "Guide to Food Education (Second Revised Edition)" (2019)