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How can some food labels show higher calories than macros calories?

Like, isn't macronutrients the only thing responsible for energy intake? So... How can a label show 50 calories for a serving worth 10g of carbs? Wouldn't 10g of carbs equates to 40 calories?... Even when considering the other macros into count it's still slightly off by like 1-30kcal every time. How can this be a thing?... And how to calculate macros by % of total calories when total calories are always higher than macros calories? (Exemple: Myfitnesspal counting 100kcal worth of food, but when calculating macros alone it's 89kcal [10g protein,10g carbs,1g fat]. Sorry if this sounds confusing, doing my best to explain this lol. Thanks in advance.

Answer

> How can a label show 50 calories for a serving worth 10g of carbs?> > Wouldn’t 10g of carbs equates to 40 calories?…> > Even when considering the other macros into count it’s still slightly off by like 1-30kcal every time. How can this be a thing?…

Is that food all carbs? Nutrition labeling guidelines have some quirks, like permitting listing zero below certain a threshold. There may be some amount of fat and/or protein per serving.

> 12. The total fat content for a serving of my product is 0.1 g. How should I declare fat and calories from fat?> > Answer: Because it is present at a level below 0.5 g, the level of fat is expressed as 0 g. Calories from fat would also be expressed as zero.

https://www.fda.gov/media/81606/download