Knuth put rigor into the field of algorithm analysis… “putting straight a story that had been very badly told.” On a smaller scale, someone should point out this obvious limitation ..

The growing body of calorie theory has one questionable pillar — level of calorie in each food can be measured, but with very poor precision. In contrast, the weight of a food can be measured with extreme precision.

https://www.nutrition-charts.com/mcdonalds-nutrition-facts-calorie-information/#burgers uses only rounded calories numbers, because 650 and 654 calories really make no difference, when the measurement noise is so high.