{
  "source": "https://www.ars.usda.gov/ARSUserFiles/80400535/Data/Purine/PURINEDATABASEANDDATASOURCES2026.xlsx",
  "source_release": "USDA and ODS-NIH Database for the Purine Content of Foods\nRelease 3, September 2026",
  "food_rows": 501,
  "beverage_rows": 15,
  "source_sheet_counts": {
    "Table1_Food data_NAm sources": 174,
    "Table2_Food data_nonNAm sources": 327,
    "Table3_Alcohol data": 15
  },
  "rules": [
    "Copy cached numeric source totals without rounding in data exports.",
    "Preserve raw/cooked name and country; do not merge duplicate food descriptions.",
    "Dash and ND base values remain strings; do not replace with zero.",
    "No food-to-beverage unit mixing.",
    "Dietary supplement tabs remain in the source workbook; not merged into food data."
  ]
}