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Anabolism and Catabolism
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The many biochemical processes that make up the body's metabolism can be grouped into two general categories - anabolism and catabolism. Anabolism is the building up of complex molecules, while catabolism is their breakdown. To build molecules and sustain life, the body needs energy. It gets this energy from the breakdown of nutrients such as glucose and fatty acids. So, for molecular construction to occur, molecular destruction must go on at the same time to release the energy required to drive the biochemical reactions. When anabolism exceeds catabolism, net growth occurs. When catabolism excesses anabolism net loss occurs.  

Anabolism includes the chemical reactions that cause different molecules to combine to from larger, more complex ones. The net result of anabolism is the creation of new cellular material, such as enzymes, proteins, cells, cell membranes, and tissues. Anabolism is necessary for growth, maintenance, and tissue repair.

Catabolism includes the chemical reactions that break down complex molecules into simpler ones for energy production, for recycling of their molecular components, or for their excretion. If energy is produced, it is stored as glycogen or fat. Recently, the trend in sports nutrition has been to focus on anti-catabolic training methods and nutrients. For example, when the muscles are strenuously trained and the muscle fibers are damaged, cortisol is released at a higher level, speeding up the breakdown of tissues. Nutrients such as L-Glutamine have been shown to reduce the effects of cortisol, resulting in reduced tissue breakdown. Antioxidants and a number of phytochemicals also have anti-catabolic effects, as does high protein and all around good nutrition. By reducing the rate of catabolism, anabolism is increased, resulting in faster recovering, a higher level of performance, and an increased growth rate.

Metabolism includes only the chemical changes that occur within the tissue cells of the body. It does not include changes to any other substances, such as foodstuffs going through the digestive tract. The body needs many nutrients to function optimally. A slight deficiency of even one vitamin can slow down metabolism and cause chaos throughout the body. The body builds thousands of enzymes to drive the metabolism in the direction dictated by activity and nutrition. So, if you generally train several hours a day, you had better make sure that your diet contains the nutrients it needs to fuel its many metabolic pathways.    

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