The energy needed to keep our bodies warm and to run our complex chemical, mechanical, and electrical systems comes from the food we eat. As we noted in several chapters earlier, this energy initially arrives on earth in the form of sunlight and then is absorbed by green plants. This is the process of photosynthesis, CO2 and H2O are combined to form          C6H1206. Hence the suns energy is stored in chemical bonds of the monosaccharide we know as glucose. We could see the equations in figure 11.5 and 11.6. In addition to having supply sufficient energy, our bodies must have some way of regulating the rate at which the energy is released. Dropping a lighted mash into a fuel tank would burn all the gasoline at once and possibly the car as well. Normally operating conditions, just enough fuel is delivered to the ignition system to supply the automobile with the energy needs without raising the temperature of the car and its occupants beyond reason. By releasing a little energy at a time, the efficiency of the process is enhanced. As a result of the energy is released gradually and the body temperature is maintained with normal limits. That energy in calories associated with the metabolism of Gram a fats, Carbohydrates, and protein is given in table 11.6. The reason for the difference in energy content between fat and carbohydrates is evident from their chemical composition. Compare the chemical formula of fatty acids, lauric acid, with that of sucrose. Both compounds have the same number of carbon atoms per molecule and very nearly the same number of hydrogen atoms. When molecules such as these burned as fuel in your body, the C and H Atoms that they contain combined with oxygen to form CO2 and H2O. You can examine these two reactions and figure 11.7 11.8.  Given on how mantis he foods contain fat, it is easy to get unhealthy percentage of daily calories from fat. Furthermore the guidelines recommend that less than 10% of calories come from saturated fatty acids and trans fat consumption can be capped at lowest possible. The first: the calories you consume is to keep your heart beating, your lungs pumping here, your brain active, all major organs working, and your body temperature about 37°C. This requirements defined basal metabolite rate, The minimum amount of energy required daily to support a basic body functions. To put this on a personal basis, consider a 20-year-old female wing 55 kg. If her body has a minimum requirement of 1 cal, her daily basal metabolic rate Will be one Cal X 55 kg X 24 hours a day, or about 1300 cal a day. In table 11.9, exercise is related in readily recognizable units such as hamburgers, potato ships, and beer. Of course by combining the information in the section with the information in earlier parts of this chapter about the types of nutrients and food, it should be clear that a healthful cannot be achieved by consuming the correct number of calories.

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