noun
a person or device that keeps track of the number of calories consumed in a day
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The calorie counter on this fitness app helps users track their daily intake.
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I use a calorie counter app to make sure I don't go over my daily limit.
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I'm trying to lose weight so I'm using a calorie counter to keep myself in check.
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His meticulous attention to detail can be compared to that of a calorie counter, always keeping track of every little thing.