Food and Nutritions
food and exactly the contributions of energy from fat, carbohydrates, protein and alcohol is quite difficult, as some bodies metabolize better than others. In addition, amounts of these nutrients are not absorbed by the body.
But generally, all the experts agree that:
* LGR. Carbohydrates (such as monosaccharides), provides 3.75 kcal.
* LGR. Of fat provides 9 kcal.
* LGR. Of protein provides 4 kcal.
* 1 gr. alcohol provides 7 kcal.
Also agree that we may obtain small amounts of energy from organic acids, eg. ac. citrus fruits and soft drinks;
Minerals, vitamins and water, do not provide energy.
Energy sources in food
Almost the entire weight of the food is made up of protein, fat, carbohydrates and water. Foods that contain high proportions of water (lettuce, fruit, clear soups, etc…) Contain little protein, fat or carbohydrates and therefore very little power.
Water-scarce food (breakfast cereals, fatty foods, etc.) Are excellent sources of energy? A gr. eg fat. Provides more than twice the energy of one gram of protein or carbohydrate.
The “hot” foods, contribute a negligible energy in relation to what is achieved by the metabolism of food, because what the body takes the “hot” food (soups, creams, etc.) Does not exceed about 8 Kcal. And energy content of the cream can exceed 150 calories. Being metabolized by the body. What happens to the heat immediately perceived and lifts the spirits when the weather is cold.
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