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Why do calories not match the macros on nutrition labels? (USA)

Example: I’m drinking a can coke right now. 39 grams of carbs, 0 grams of protein and fat. Nutritional label says the can is 140 calories. But 39x4=156. What am I missing?

I’ve noticed this on quite a few packaged foods.

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Answer

Different carbs have slightly different calorie counts, they’re just all rounded to 4 for convenience. And any food above 50 calories can be rounded to the nearest 10 calories.

https://www.reddit.com/r/nutrition/comments/44ho6b/a_can_of_coca_cola_has_39g_sugar_and_140_calories/czqassm

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