Table 2.4 shows the amount of energy provided by 100 g of each of the foods shown in Table 2.2. Arrange the nine foods with the highest energy values in order, starting with the highest and ending with the lowest. Look at the nutrient content of these foods in Table 2.2. Arrange the nine foods from part a) into groups according to whether you think the energy is stored as fat or as carbohydrate. Do fats and carbohydrates store the same amount of energy (see also page 26)? Explain your answer.
Answers
Answer:
kj
Explanation:
As stated in Chapter 1, the translation of human energy requirements into recommended intakes of food and the assessment of how well the available food supplies or diets of populations (or even of individuals) satisfy these requirements require knowledge of the amounts of available energy in individual foods. Determining the energy content of foods depends on the following: 1) the components of food that provide energy (protein, fat, carbohydrate, alcohol, polyols, organic acids and novel compounds) should be determined by appropriate analytical methods; 2) the quantity of each individual component must be converted to food energy using a generally accepted factor that expresses the amount of available energy per unit of weight; and 3) the food energies of all components must be added together to represent the nutritional energy value of the food for humans. The energy conversion factors and the models currently used assume that each component of a food has an energy factor that is fixed and that does not vary according to the proportions of other components in the food or diet.
3.1 JOULES AND CALORIES