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( Metabolism) Metabolism is the set of chemical reactions that occur in living organisms in order to maintain life. These processes allow organisms to grow and reproduce, maintain their structures, and respond to their environments. Metabolism is usually divided into two categories. Catabolism breaks down large molecules, for example to harvest energy in cellular respiration. Anabolism, on the other hand, uses energy to construct components of cells such as proteins and nucleic acids.

The chemical reactions of metabolism are organized into metabolic pathways, in which one chemical is transformed into another by a sequence of enzymes. Enzymes are crucial to metabolism because they allow organisms to drive desirable but thermodynamically unfavorable reactions by coupling them to favorable ones. Enzymes also allow the regulation of metabolic pathways in response to changes in the cell's environment or signals from other cells.

The metabolism of an organism determines which substances it will find nutritious and which it will find poisonous. For example, some prokaryotes use hydrogen sulfide as a nutrient, yet this gas is poisonous to animals.^[1] The speed of metabolism, the metabolic rate, also influences how much food an organism will require.

A striking feature of metabolism is the similarity of the basic metabolic pathways between even vastly different species. For example, the set of carboxylic acids that are best known as the intermediates in the citric acid cycle are present in all organisms, being found in species as diverse as the unicellular bacteria Escherichia coli and huge multicellular organisms like elephants.^[2] These striking similarities in metabolism are most likely the result of the high efficiency of these pathways, and of their early appearance in evolutionary history.^[3][4]

Metabolism Subcategories Metabolism Articles Anti-Aging and Stress by Carson Danfield by Carson Danfield What do most people do when they are stressed? They frown. And when you frown a lot and for a long time those frown lines and the associated wrinkles on your brow become permanent fixtures on your face and the wrinkles make you look older. Ha... Anti-Aging Grape Seed AntiOxidant by Carson Danfield by Carson Danfield It is clear from scientific research that antioxidants can have a big influence on the rate that we age and tests have also shown that one of the best sources of antioxidants is from grape seed extract. The various different types of antioxid... Exercise to Boost Your Metabolism and Increase Weight Loss by Michael Podlesny Exercising as we all know has many benefits. It truly is the one entity that can slow down the aging process. We also know that implementing a regular exercise routine also contributes to weight loss. Your metabolism plays a key roll in to just how q... Why It's Harder for Women to Lose Weight by Yuri Elkaim It has been my experience that, in general, women are at a distinct disadvantage when compared to men when it comes to obesity and their ability to lose weight. There are a couple of reasons that can help explain this phenomenon. First, wo... Fat Burning Metabolism Secretes by Renie Rutten There are many forms of metabolism going on in your body right now, but the one we're talking about is the metabolism of fat. This is actually something that the liver does when it converts stored fat to energy. Weight loss is primarily the r... Swift Instructions to Improve Your Metabolic Rate by Roger Titley There are a large number of people who would give anything to increase their metabolism. Having a high metabolic rate enables the body to maintain the rapid burning of fat and lose weight fast with the minimum amount of activity. Metabolism is the pr... Green Tea and Metabolism/Weight Loss by New Vitality Editorial Team Obesity in the United States has reached epidemic proportions. The Centers for Disease Control and Prevention announced that 66 percent of the American population, aged 20 or older, is either overweight or obese. Overweight and obese people are at h... Nutrition 101: A crash course in proper eating for those who want to maintain or lose weight by Dan Cantor By Dan Cantor, CPT When it comes to diet and proper nutrition, there are many varying and often conflicting philosophies. One size does not fit all. Everyone has different needs, goals and metabolic predisposition. One thing y... Confessions of a Fad Diet Junkie by Amanda McNeill I’ve drunk nothing but lemon water mixed with maple syrup for three days. I’ve eaten nothing but cabbage soup for two weeks. I’ve eaten nothing but bacon and eggs for a month. The Master Cleanse, The Cabbage Soup Diet, Atkins - I even bought The Holl... 7 Ways For Women To Look Great Naked! by Lucas Wold My gym is located right by Lake Tahoe, which is home to the sexiest beaches in Nevada, hands down. It should come as no surprise then, that I am most often called on for help lookin' good in a bikini. Here are SEVEN of my sizzling hot tips to...