Incorrect. It's an imprecise measure. You said "Some studies show as much as a 20% difference in what was on the label and the actual caloric content". So then the labels are accurate within a 20% margin of error at worst.
Sounds like a pedantic little nag but then again
- "Star Spangled Blizzard - Mini" - 430 calories
- 1 serving of broccoli (1/2 cup, cooked) - 25 calories
A 50% margin of error would be fine given some of the choices out there. With that said, you usually don't pick between a dq blizzard or broccoli. More reasonable comparisons would be a blizzard vs water (0 cal) or broccoli vs french fries (regular size - 290 cal).
In a nutshell: if a thermostat's off by up to 10 degrees it can still ballpark whether the temperature's livable.
https://www.dairyqueen.com/us-en/Company/Nutrition/Treats/
https://www.dairyqueen.com/us-en/Company/Nutrition/Treats/
https://www.livestrong.com/article/402398-what-is-a-serving-...