Generally speaking, proteins, fats and carbohydrates provide different rates of combustion. Fat is one of the most efficient, compact sources of energy in all the foods you eat. One gram of fat when burned in the body will yield 9 calories. Proteins and carbohydrates are not as efficient. The rate of combustion for both of these fuel sources is 4 calories per gram. Thus we have a 9-4-4 ratio of values applied to the main elements of a menu. Alcohol has 7 Calories b per gram , and it has no nutrition value to the body
Conversion Rates for Proteins fats and Carbs
The conversion numbers 9-4-4 are used to convert a given amount of food (1 gram) into calories. Thus 100 grams of protein (x 4) is worth 400 calories. 10 grams of fat (x 9) is worth 90 calories, and 200 grams of carbohydrates (x 4) is equal to 800 calories