Association Between Extended Lunch Duration and Reduction of Leftovers in School Meals

Association Between Extended School Lunch Time and Changes in Plate Waste and Eating Behaviors - Association Between Extended School Lunch Time and Changes in Plate Waste and Eating Behaviors

Status

Active, not recruiting

Phases

Unknown

Study type

Interventional

Source

JPRN

Registry ID

JPRN-UMIN000058922

Enrollment

112

Registered

2025-08-30

Start date

2025-05-23

Completion date

Unknown

Last updated

2026-06-29

For informational purposes only — not medical advice. Sourced from public registries and may not reflect the latest updates. Terms

Conditions

healthy adolescents

Interventions

Control, Usual lunch duration, 15 minutes. Intervention, Extended lunch duration, 20 minutes.

Eligibility

Sex/Gender

All

Inclusion criteria

Inclusion criteria: Second-year students of Junior High School A in Nankoku City Students who usually eat school lunches provided at the school Students present on both survey days and who participated in both the usual lunch duration and the extended lunch duration conditions Students in good physical and mental health, attending regular school activities

Exclusion criteria

Exclusion criteria: Students absent on the survey day(s) or those who participated in only one of the two survey sessions Students with missing data in primary outcomes or questionnaires (excluded from analysis)

Design outcomes

Primary

Measure	Time frame
Individual plate waste (g) for each dish, measured by weighing method	—

Secondary

Measure	Time frame
Subjective satisfaction with lunch time (How was the lunch time today? [long / somewhat long / somewhat short / short]; Was today's lunch time sufficient? [yes / no]) ) Body Mass Index (BMI)	—

Countries

Japan

Contacts

Public Contactyurika kyan

Okinawa University Department of Health and Nutrition

y-ganaha@okinawa-u.ac.jp0989017304

Outcome results

None listed

Source: JPRN (via WHO ICTRP) · Data processed: Jul 3, 2026