Four photo-based calorie apps underestimated the energy in 102 meals prepared in an NIH metabolic kitchen by an average 250 to 345 calories, while underestimating fat by about 30 grams in this laboratory comparison. [1] [2]

Researchers photographed meals whose ingredients had been weighed to 0.1 gram, then compared estimates from MyFitnessPal, LoseIt!, CalAI, and Appediet with the controlled reference; all four missed energy by roughly one third, although their carbohydrate estimates were more consistent. [1] [2]

The denominator is meals, not users, and the record is a preliminary Nutrition 2026 abstract rather than a peer-reviewed publication, with wide agreement limits and no measurement of what people corrected manually, ate in daily life, or did after seeing an estimate.

The scheduled July 25 oral session fixes the evidence stage but does not itself establish a completed presentation, independent replication, weight change, disordered eating, or clinical harm, and averages across the four products do not make every app equally inaccurate in every setting. [1] [2]

No authorized X status was recovered, so convenience marketing has no verified platform counterweight here; the practical conclusion is narrower than a health verdict, because a photograph can reduce logging effort without yet serving as a reliable measurement of meal energy or fat.

-- KENJI NAKAMURA, Tokyo