Source Hierarchy

Purpose

This document defines the evidence ranking for nutrition-record estimation. Use the strongest available evidence first and name that source explicitly in the durable record.

Ranking

1. Level 1, label-visible: visible nutrition label or branded product label confirmed in the image.
2. Level 2, athlete-text: athlete-provided ingredients, quantities, product names, or preparation details.
3. Level 3, recurring-food: previously confirmed recurring food already established in this workspace.
4. Level 4, photo-heuristic: photo-only estimate without supporting label or athlete confirmation.

Operating rules

• Use the strongest available source for each estimate rather than forcing a single-source record.
• Label-visible or athlete-text evidence can anchor one component while the rest of the meal remains heuristic.
• Photo-only estimates must state their uncertainty explicitly and usually remain review-gated.
• When several sources contribute to one record, summarize that mix in Lookup source summary.