In the age of frictionless self-knowledge, we have grown accustomed to trusting the lens as a mirror of truth — yet a study from the National Institutes of Health reminds us that convenience and accuracy are not the same covenant. Researchers tested four widely used photo-based calorie-tracking apps and found that all four consistently underestimated the nutritional content of meals, sometimes by hundreds of calories and thirty grams of fat per sitting. The finding is less a condemnation of technology than a caution about the quiet assumptions we make when we outsource judgment to a machine: t