Proteins have an energy value of 17.2 kJ / g, fats have 38.9 kJ / g, and carbohydrates have a nutritional value of 17.2 kJ / g. Proteins and carbohydrates have the same nutritional value in both kJ / g and kcal / g. When food is broken down, carbohydrates are primarily used to provide energy to the body. Protein is needed as a building material. They are broken down into amino acids, and then reassembled into proteins the body needs. Fats have an energetic function, so people who are engaged in hard physical labor eat a lot of fatty foods, as they have a high energy value.
One of the components of a person's success in our time is receiving modern high-quality education, mastering the knowledge, skills and abilities necessary for life in society. A person today needs to study almost all his life, mastering everything new and new, acquiring the necessary professional qualities.