The LUNCHES Study: Elementary School Children's Packed Lunch Contents and Intake in the Traditional vs. Balanced School Day Schedule
Bibliographic record
Abstract
The Balanced School Day (BSD), an alternative to the Traditional Schedule (TS), provides two 20-minute eating periods during the school day, rather than a midday lunch break. Widespread implementation of the BSD schedule has occurred across Ontario with limited systematic evaluation of potential health outcomes. The purpose of this study was to compare the food and nutrient value of grade 3 and 4 students’ packed lunch contents and consumption in the BSD versus TS, by direct observation. When compared to the TS, more BSD students had a sugar-sweetened beverage packed in their lunch. Greater portions of snack items were also packed and consumed in the BSD. Correspondingly, children in the BSD consumed more energy, carbohydrates, saturated fatty acids, total sugar, and percent energy from total sugar than in the TS. These findings suggest the BSD may negatively affect the quality of packed lunches, increasing the risk of adverse health outcomes.
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How this classification was reachedexpand
Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.002 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.001 |
| Science and technology studies | 0.001 | 0.000 |
| Scholarly communication | 0.001 | 0.001 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.000 | 0.001 |
| Insufficient payload (model declined to judge) | 0.000 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one teacher head, not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".