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