Changes

==Criticism==

==Criticism==

The Bundesinstitut für Risikobewertung (BfR, Federal Institute for Risk Assesment) deems dietary supplements unnecessary for healthy persons living on a regular diet<ref>http://www.bfr.bund.de/cd/945</ref>. Such a diet will provide the human body with everything it needs. An additional intake of single nutrients therefore was not necessary. An unbalanced, one-sided diet will not become balanced by the use of dietary supplements. Only in specific situations uncommon in Germany will necessitate a special supplementation of one's diet with particular nutrients. According to the German Nutrition Society, supplementation is reasonable only regarding iodine (in the form of iodated salt) and folic acid (with pregnant women).

The Bundesinstitut für Risikobewertung (BfR, Federal Institute for Risk Assesment) deems dietary supplements unnecessary for healthy persons living on a regular diet<ref>http://www.bfr.bund.de/cd/945</ref>. Such a diet will provide the human body with everything it needs. An additional intake of single nutrients therefore was not necessary. An unbalanced, one-sided diet will not become balanced by the use of dietary supplements. Only specific situations uncommon in Germany will necessitate a special supplementation of one's diet with particular nutrients. According to the German Nutrition Society, supplementation is reasonable only regarding iodine (in the form of iodated salt) and folic acid (with pregnant women).

An analysis of different meta and randomized studies evaluated the current state of knowledge regarding the influence of vitamins A, C and E (which are also promoted as [http://www.psiram.com/ge/index.php?title=Antioxidantien antioxidants]) as well as beta-carotene for treatment or prevention of coronary diseases, cancer, eye diseases, and common cold. It concluded that the existing randomized studies do not allow to deduce a clear clinical value. Additionally, beta-carotene increases the probability of acquiring lung cancer and the overall mortality rate, especially with smokers.<ref>Arzneimitteltelegramm, 2003; 34: 100-2, 111-3</ref>

An analysis of different meta and randomized studies evaluated the current state of knowledge regarding the influence of vitamins A, C and E (which are also promoted as [http://www.psiram.com/ge/index.php?title=Antioxidantien antioxidants]) as well as beta-carotene for treatment or prevention of coronary diseases, cancer, eye diseases, and common cold. It concluded that the existing randomized studies do not allow to deduce a clear clinical value. Additionally, beta-carotene increases the probability of acquiring lung cancer and the overall mortality rate, especially with smokers.<ref>Arzneimitteltelegramm, 2003; 34: 100-2, 111-3</ref>

Anti-oxidants are frequently used by cancer patients to counter unwanted effects of chemo or radiotherapy. Experimental as well as clinical data, however, support the assumption that they, to a certain extent, may even protect tumor cells. According to several randomized studies, particularly the concurrent intake of high doses of anti-oxidants during radiation therapy impairs response and decreases survival time.<ref>"Prävention mit Antioxidanzien: Schaden überwiegt", Arzneimitteltelegramm, 12/2008</ref>

Anti-oxidants are frequently used by cancer patients to counter unwanted effects of chemo- or radiotherapy. Experimental as well as clinical data, however, support the assumption that they, to a certain extent, may even protect tumor cells. According to several randomized studies, particularly the concurrent intake of high doses of anti-oxidants during radiation therapy impairs response and decreases survival time.<ref>"Prävention mit Antioxidanzien: Schaden überwiegt", Arzneimitteltelegramm, 12/2008</ref>

==Dietary supplements and Doping==

==Dietary supplements and Doping==