5.5% of Open Food Facts Labels Fail Internal Nutrition Consistency Check, Study Finds

A technical audit of 857,655 food product labels from the Open Food Facts database found that 46,757 — about 5.5 percent — contain contradictions between their declared calorie values and their listed macronutrients. The analysis, conducted by the team behind calorie-tracking app Lean, applied EU Atwater energy factors to calculate expected calories from protein, carbohydrates, fat, fiber, and alcohol, then compared those figures against the declared kcal values. A label was flagged as incoherent only when the discrepancy exceeded both 10 percent and 30 kcal per 100g, to filter out noise from near-zero-calorie products. Protein bars had the highest failure rate among major food categories, with 20.8 percent of labels deemed inconsistent — the worst of any group tested. When incomplete and aberrant entries are also counted, roughly one in three products in the dataset cannot be fully trusted by a nutrition tracker without additional validation.