Most people treat nutrition labels as immutable truths, but if you've read the FDA guidelines, you know there's a +/- 20% allowable variance. For someone targeting a 500-calorie deficit, that error margin can completely swallow your progress. I've spent the last six months 'debugging' my intake by cross-referencing my logged calories against my weight's moving average (using a 7-day exponential smoothing function). What I found was a consistent 12% delta between my 'clean' logs and my actual m