http___matuzalem.hr_o-antioksidansima__1.xml
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Free radicals and Antioxidants In this advanced age that has progressed so much in science and technology, we are enjoying the comforts and paying the price with our health. There are few things which we need to understand in order to maintain a healthy lifestyle. We wont adopt good habits until we know the logic behind it. So lets understand the terms “Free radicals” and “Antioxidants”. What are free radicals? It is something “Free” that you would never want to enjoy 🙂 Free radicals are atoms or groups of atoms with an odd (unpaired) number of electrons. Free radicals are very unstable. They react quickly with other molecules, trying to capture the needed electron to gain stability (pairing). Free radicals attack the nearest stable molecule and steal its electron. When the attacked molecule loses its electron, it becomes a free radical itself, beginning a chain reaction. Abundance of free radicals can lead to health risks. Free radicals are created in our body due to many factors like environmental toxins, exposure to ionizing radiation, digestion, or when oxygen interacts with certain molecules. They can damage the cells and even DNA thus raise the risk of cancer and other diseases, even hormonal acne. Although our body produces many enzymes that can help us fight and neutralized free radicals but they are not sufficient so we must supply antioxidants through our diet. What are antioxidants? Antioxidants are molecules, which can safely interact with free radicals. Antioxidants neutralize free radicals by donating one of their own electrons and terminate the chain reaction. The antioxidants themselves don’t become free radicals by donating an electron because they are stable in either form. Antioxidants are also known as “free radical scavengers.” They prevent free radical damage. Fruits, vegetables, and grains are rich sources of antioxidants. The vitamins C and E also protect the body against free radicals. Some terms to understand Ionizing radiation: It is a type of radiation given by x-ray procedures, radioactive substances, rays that enter the Earth’s atmosphere from outer space etc. It increases chemical activity inside cells that cause an atom or a molecule in a cell, to lose an electron thus creating a free radical. Environmental toxins: Cigarette smoke, Air pollution, herbicides, some metals, and high-oxygen atmospheres may contain large amounts of free radicals and stimulate the body’s cells to produce more free radicals. So keep shooting your free radicals by eating antioxidants 🙂 and enjoy a healthy life!
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O Antioksidansima Slobodni radikali Svakodnevno smo svjedoci porasta različitih bolesti, a karcinomi gotovo postaju epidemijskih razmjera. Zašto je to tome tako? Plaćamo cijenu tehnološkog napretka i velike zagađenosti, posebno u hrani! Pesticidi, teški metali, umjetne boje, plastična i aluminijska ambalaža, industrijski prerađena hrana ... brojni toksini koji se u njima nalaze oštećuju tjelesne stanice i nazivamo ih slobodni radikali. Osim iz hrane naš je organizam izložen napadu slobodnih radikala i iz zagađenog zraka i vode, zbog pušenja i prevelikog stresa, uslijed dugotrajnog korištenja lijekova ili teških bolesti (koje kao posljedicu imaju pojačano stvaranje slobodnih radikala). Slobodni radikali su vrlo nestabilne molekule koje imaju manjak elektrona te reagiraju s prvom molekulom do sebe uzrokujući oštećenje stanica. Ukoliko se brzo ne uklone uzrokuju prijevremeno starenje i razne bolesti. ”Svaku našu stanicu dnevno napada 10.000 slobodnih radikala !“ (George Mateljan: “The World’s Healthiest Foods” -SAD, 2007.). Ukoliko nastane više slobodnih radikala nego što ih naše tijelo može neutralizirati i eliminirati, nastaje oksidativni stres odnosno nakupljanje slobodnih radikala. Nakupljanje slobodnih radikala uzrokuje kiselost krvi, nastaju degenerativna oštećenja stanica, oštećuje se struktura DNA i ubrzava starenje. Stručnjaci koji proučavaju učinak propadanja stanica i starenje, navode slobodne radikale kao glavne krivce za nastajanje brojnih kroničnih bolesti: - autoimune bolesti, rak, ciroza jetre, multipla skleroza, Parkinsonova bolest, koronarne srčane bolesti, emfizem, dijabetes, poremećaj cirkulacije, reumatizam, artritis i sl. Antioksidansi Srećom, kao pomoć postoje antioksidansi, spojevi koji “uništavaju” slobodne radikale. U organizam ih unosimo hranom i dodacima prehrani, a imaju sposobnost neutraliziranja slobodnih radikala te njihovog eliminiranja iz stanica. Antioksidansi djeluju na 2 načina: - izravnom enzimskom katalizom - reagiraju sa slobodnim radikalima dajući im elektron i neutralizirajući ih. Najpoznatiji antioksidansi su vitamini A,C, E i selen te flavonoidi. Flavonoidi Flavonoidi su nove zvijezde među antioksidansima i najproučavanije molekule posljednjih desetak godina. To su biljni pigmenti, polifenoli, koji daju živopisne boje voću, povrću i cvijeću, a nama daju antioksidativnu zaštitu. Nalazimo ih u bobičastom voću, zelenom čaju, crvenom vinu i raznim vrstama povrća. Klinički je dokazano da flavonoidi imaju: - antioksidativno - protuupalno - antivirusno - antitumorsko djelovanje Ako redovito konzumiramo svježe voće i povrće, ekološki uzgojeno, možemo osigurati dovoljan unos antioksidansa. Međutim, ako se ne hranimo raznoliko i kvalitetno te ako smo izloženi povećanom stresu, preporučljivo je uzimati antioksidanse u obliku dodataka prehrani. ”Prave tajne potpunog uspjeha kriju se u vježbanju, prestanku pušenja i konzumiranju nekih od vrijednih antioksidansa.“ (mag. pharm. Mimi Vurdelja, nutricionist-farmakolog HOO-a)