The following is what has been discovered by biochemists more than 100 years after the Prophet Joseph Smith received the revelation recorded in Doctrine and Covenants, 89:12-13:
"Yea, flesh also of beasts and of the fowls of the air, I, the Lord, have ordained for the use of man with thanksgiving; nevertheless they are to be used sparingly;
And it is pleasing unto me that they should not be used, only in times of winter, or of cold, or famine."
Eating in times of winter or cold
The calories per gram, referring to the three basic foods, are what we see on cereal boxes and other food packaging today.
Calories per gram:
Fats — 9
Carbohydrates — 4
Protein — 4
These are values produced when the substance is burned in a bomb calorimeter, a metal container used to determine total calories by measuring the heat of chemical reactions.
However, the pattern of chemical change in a living cell is distinctive and different from anything encountered in non-living organisms.