The store calories as fat are the difference between calorie intake and spend on various activities of life. With Food Composition Tables we can see the calories we eat but what are they actually spend?
1. What we get with food calories?
Food nutrients, vitamins, minerals and water. The main nutrients in foods are fats, carbohydrates and proteins. Hydrates, fats and proteins provide the body with energy that is measured as calories. Vitamins, minerals and water do not contribute calories.
Fats provide 9 Kcal per gram. Carbohydrates provide 4 Kcal per gram. Proteins provide 4 Kcal per gram. Fats and carbohydrates are mainly used as an energy source. The proteins serve mainly as plastic material for growth and tissue repair.
In real life we find not only a meal consisting of fat (except oils), carbohydrate or protein food but have a mixed. Thus, foods such as beef traditionally is considered a food protein but has 20.70 grams of protein, 5.40 grams of fat and trace amounts of carbohydrates.
Or the bread is considered the example of carbohydrate per 100 grams is 52 grams carbohydrates 8 grams of protein and 1.6 grams of fat. Thus each of the nutrients from food are entered together with each meal and can not be separated. To see what proportion of each nutrient is every food there calls Tables of Food Composition reflecting the study of the components of each particular food. There are several tables with variations mainly by the geographical origin of the food samples.
