Changes in Teenagers' Dietary Choices in Smart School Canteens: A Pre-Post Single-Arm (Quasi-Experimental) Study of a Digital Nudge Intervention.

Comparison of Students’ Dietary Nutrient Intakes Before and After the Digital Nudge Intervention in Smart School Canteen After analyzing the nutrient intake of students’ meals, it was found that calcium intake showed an increasing trend after the system was launched ( p = 0.093, p < 0.1), with the median intake rising from 683.00 (P25–P75: 518.00–980.21) mg to 804.11 (P25–P75: 468.89–1166.74) mg, reaching the recommended value in the student meal nutrition guidelines from 39.3% to 50.9%.

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However, the intake of other key nutrients, such as vitamin C, increased slightly but did not reach statistical significance.

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Besides the conventional significance level of p < 0.05, we also reported marginally significant results when p < 0.1. 3.

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