Reliable detection of Win98 may not be possible.
Food calories come from carbohydrates, proteins, and fats.
A gram of carbohydrate contains 4 calories. A gram of protein also contains 4 calories. A gram of fat contains 9 calories - more than twice the amount of the other two. That's why a food with the same serving size as another may have far more calories. A high-fat food has many more calories than one low in fat and higher in protein or carbohydrates.