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Dehydration

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Dehydration
Mike Martin
SCI/241
01/21/2012
Mike Esposito

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Water is important for creating and sustaining life. In humans, the body is made up of about sixty percent water. Every part of our body including muscle, bone, and blood consists of some percentage of water. About a third of our total body water is extracellular fluid, which is fluid outside and between cells and water in our blood. This is the most important as the blood in our bodies delivers the oxygen and nutrients to all cells. Without the proper amount of water everyday there is a risk of dehydration. Severe dehydration can cause nerve damage, seizures, abnormal blood pressure, brain damage, arrhythmia, and even death.

Water is essential to everyday health maintenance as it helps in the balance of our body fluids, such as absorption, digestion, circulation, and distribution of nutrients. The muscles, which are about seventy-five percent water, need that balance of fluids to perform properly. This is especially true when exercising, or running. Body temperature is also regulated with the help of water, since water changes temperature slowly. Water also helps the body get rid of toxins through the kidneys. Without enough fluids the kidneys will keep extra fluids instead of passing them through urine. Water also helps pass food through the intestines, which in turn prevents constipation.

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Every function in our bodies runs smoothly and works properly with an adequate supply of water. This could be from drinking water or eating certain foods, such as fruits and vegetables. When there is a lack of water in the body, these functions start to diminish. Athletes and people who do extensive workouts are instructed to drink every few minutes to stay hydrated. If you have ever watched a professional football game I’m sure you noticed that the players are always drinking between plays and on the sidelines. This is so they stay hydrated for maximum performance from their bodies. One of the early signs of dehydration is fatigue; others include headaches, loss of appetite, and dark colored urine. Continued dehydration symptoms include lack of physical performance, confusion, nausea, and difficulty concentrating.

Alcohol and caffeine can play a role in the hydration levels in the body, as they can aid in dehydration. When alcohol is consumed it is traceable in the bloodstream within minutes. The kidneys regulate water loss through urine, but alcohol stops this process by slowing down the activity of the antidiuretic hormone (ADH). This hormone increases the amount of water reabsorbed through the kidneys back into the body when water levels are low. Without the ADH activity the kidneys just pass all fluids out of the body, which can cause dehydration. This is why people get “hang-over’s”. Too much alcohol and even caffeinated drinks deprive the body of water resulting in early signs of dehydration such as headaches.

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Electrolytes help in the aid of regulating fluid balance in the body. Electrolytes, sodium, potassium, and chloride separate in water and form positive and negative charged ions, which conduct electrical current. This includes transmissions of nerve impulses and contraction of muscles. These impulses are created when sodium and potassium ions move across the nerve cell membranes. Sodium regulates the total amount of water in the body. The movement of sodium is critical for communication in the brain, muscles, and nervous system because of these electrical signals. Sodium also helps in the regulation of blood pressure.

Potassium is the positive ion found inside of the cells, where as sodium is found on the outside of the cells. Potassium is essential for normal cell function. Potassium helps in regulating a normal heartbeat. This is why dehydration can cause arrhythmias in severe cases. Potassium also aids in keeping a healthy blood pressure, kidney function, and helps lungs eliminate carbon dioxide. Some natural foods that are high in potassium include, bananas, oranges, and potatoes.

Chloride, the negatively charged ion, helps in keeping the amount of fluid inside and outside of the cells in balance. Most of the chloride in our bodies comes from table salt and processed foods. Chloride promotes normal digestion, nerve transmission, energy production, and water distribution.

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Drinking water and staying hydrated is more important than eating. A person can last about 8 days without food, but only 2-3 without water. When exercising drink water throughout the routine, and for the serious workouts longer than an hour sports drinks is a good idea to replenish those electrolytes. Staying hydrated is more than just drinking water. A healthy balanced diet is also important as we get water from most foods, along with other nutrients. Eating lower sodium and higher potassium foods such as fruits and vegetables can help in staying hydrated as well. It is best not to drink too much caffeine or alcohol when exercising or in hot weather sweating. Always have a bottle of water with you in your car, at work, or on a walk.

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WebMD. (2008). Healthy Eating & Diet. Retrieved from http://www.webmd.com/diet/features/6-reasons-to-drink-water?page=2

Susantaney.net. (n.d.). Chloride. Retrieved from http://susantaney.net/vm.chloride.html

MedicineNet.com. (2008). Electrolytes. Retrieved from http://www.medicinenet.com/electrolytes/article.htm

University of Phoenix. (2012). Water and Minerals. Retrieved from University of
Phoenix, SCI241 - Nutrition website.

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