The energy thats given to the body by food is what

The energy that's given to the body by food is  measured in units called calories.
All food have corresponding calorie values that help track how much energy you consume in a day. The maximum or ideal calorie intake per day is 2,000 calories. SO from What I heard It Takes about 1 gram carbohydrates is Equal to 4 calories. i Gram of protein is Equal To 4 calories, And Etc
People with higher muscle composition and metabolic rate tend to need more calories in order to maintain their body weight  

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