Question

How many calories are provided by a food that contains 29 grams of carbohydrate, 6 grams of protein, and 1 gram of fat?

Answer 1

Energy (caloric) value of foods is indicated by calories, which measure the amount of heat that the food releases in the metabolic process. In physiology, it is determined by the energy balance of the organism, ie the heat exchange between the organism and the external environment.
Calories of nutrients:
1 g of protein = 4 kcal (kilocalories)
1 g of fat = 9 kcal
1 g of carbohydrates = 4 kcal
1 g of alcohol = 7 kcal
1 g of organic acid = 3 kcal

According to the table above, we can calculate required value:

29x4 + 6x4  + 1x9= 149 kcal/g