Fat has more than twice as many calories per gram as carbohydrates and proteins. a gram of fat has about 9 calories, while a gram of carbohydrate or protein has about 4 calories. the expression below represents the total number of calories in a food item. 9x+4(y+z) what does the term 4(y+z) represent? a. the number of grams of fat in a food item b. the number of calories in a food item from fat c. the number of grams of carbohydrates and proteins in a food item d. the number of calories in a food item from carbohydrates and proteins