It was recently reported that some protein nutrition products contain far more carbohydrate than their labels declared. When choosing a protein product, you may use this simply formula to calculate the total carbohydrate content and avoid the consequences of inaccurate product labeling.
First you need to know that there are 4 calories in one gram of protein, 4 calories in one gram of carbohydrate, and 9 calories in one gram of fat. To calculate how many calories come from fat, protein, and carbohydrates you simply multiply the number of grams by the number of calories per gram.
Next, start with the number of calories for the product and subtract the fat and protein calories. Then divide that number by 4, and compare it to the number of carbohydrate grams listed on the label. “Beware” if your number is higher than the number of carbohydrate grams listed on the label – it’s an indication that there are more carbs in the product than are declared on the label.