The rumor came about due to the dye; Yellow 5 used in MD. It has since been quashed by the FDA and the medical community. The dye
may cause allergic reactions to those with a hypersensitivity to the dye's components. However, there is zero evidence in any decrease of sperm counts by consumers.
Yellow 5 is also called tartrazine and is one of the more common food dyes used globally. It can be found in soft drinks, candies, cotton candy, energy drinks, instant puddings, flavored chips (Doritos, Nachos, etc.), dry cereals, powdered drink mixes, cake mixes, sports drinks, ice cream, ice pops, chewing gum, marzipam, jams, jellies, gelatins, marmalade, mustard, horseradish, yogurt, noodles, pickles, fruit cordials, biscuits, lemon products, honey products, and is used in many convenience foods. It's also found in soaps, cosmetics, shampoos, vitamins, antacids, medicinal capsules, and in several prescription drugs.
Those displaying an allergic reaction to tartrazine frequently have asthma and aspirin intolerance. The reactions are usually anxiety, migraines, clinical depression, blurred vision, itching, malaise, heatwaves, shortness of breath, and sleep disturbance. These allergic reactions are estimated to affect 0.12% of the general population.
References
^ http://www.sciencelab.com/xMSDS-Tartrazine-9927619
^ http://pubs.acs.org/cgi-bin/article.cgi/iecred/2003/42/i02/html/ie020228q.html
^ "E102 Tartrazine, FD&C yellow No.5". UK Food Guide. http://www.ukfoodguide.net/e102.htm. Retrieved 2007-11-30.
^ "Synthetic food coloring and behavior: a dose response effect in a double-blind, placebo-controlled, repeated-measures study. [J Pediatr. 1994 Nov;125(5 Pt 1):691-8". Ncbi.nlm.nih.gov. 2008-12-03. http://www.ncbi.nlm.nih.gov/pubmed/7965420. Retrieved 2009-04-15.
^ "Food Reactions website". Foodreactions.org. http://www.foodreactions.org/allergy/additives/100.html#Tests. Retrieved 2009-04-15.
^ Elhkim, M. O., & et al. (2006). New considerations regarding the risk assessment on Tartrazine: An update toxicological assessment, intolerance reactions and maximum theoretical daily intake in France. Requl Toxicol Pharmacol, 47(3), 308-316.
^ ab "Does FD&C Yellow No. 5 cause any allergic reactions?". United States Food and Drug Administration. http://www.cfsan.fda.gov/~dms/qa-adf5.html. Retrieved 2007-10-20.
^ Rowe KS, Rowe KJ Synthetic food coloring and behavior: a dose response effect in a double-blind, placebo-controlled, repeated-measures study J Pediatr 1994 Nov;125(5 Pt 1):691-8
^ "Tartrazine sensitivity. [Am Fam Physician. 1990] - PubMed Result". Ncbi.nlm.nih.gov. 2008-12-03. http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=2239641&dopt=Abstract. Retrieved 2009-04-15.
^ "PubMed 6721262". Ncbi.nlm.nih.gov. 2008-12-03. http://www.ncbi.nlm.nih.gov/entrez/...=Retrieve&dopt=abstractplus&list_uids=6721262. Retrieved 2009-04-15.
^ Tanaka T, Takahashi O, Oishi S, Ogata A (October 2008). "Effects of tartrazine on exploratory behavior in a three-generation toxicity study in mice". Reprod. Toxicol. 26 (2): 156–63. doi:10.1016/j.reprotox.2008.07.001. PMID 18687399.
^ Tanaka T (February 2006). "Reproductive and neurobehavioural toxicity study of tartrazine administered to mice in the diet". Food Chem. Toxicol. 44 (2): 179–87. doi:10.1016/j.fct.2005.06.011. PMID 16087284.
^ Moutinho IL, Bertges LC, Assis RV (February 2007). "Prolonged use of the food dye tartrazine (FD&C yellow no 5) and its effects on the gastric mucosa of Wistar rats". Braz J Biol 67 (1): 141–5. PMID 17505761.
^ "Parents warned of additives link". BBC News. 2007-09-06. http://news.bbc.co.uk/1/hi/health/6979976.stm. Retrieved 2009-04-15.
^ BBC Europe-wide food colour ban call April 10, 2008
^ FSA Board discusses colours advice April 10, 2008
^ BBC Ministers agree food colour ban November 12, 2008
^ ORA. "IMPORT ALERT IA4502". Fda.gov. http://www.fda.gov/ora/fiars/ora_import_ia4502.html. Retrieved 2009-04-15.
^ "Europe-wide food colour ban call". BBC News. April 10, 2008. http://news.bbc.co.uk/2/hi/health/7340426.stm.
^ "Urban Legends Reference Pages: Mountain Dew Shrinks Testicles". www.snopes.com. 2005-12-31. http://www.snopes.com/medical/potables/mountaindew.asp. Retrieved 2008-04-25.
This is a condensed explanation just to show that a few minutes of research can help disprove rumors instead of perpetuating them.