Kenya's David Lekuta Rudisha bites the gold medal during ceremony for the men's 800-meter final, Aug. 9, 2012, at the London Olympic Games. (AP Photo/Matt Slocum)

United States' Sanya Richards-Ross takes a bite of her gold medal for the women's 400-meter final during the athletics in the Olympic Stadium, Aug. 5, 2012. (AP Photo/Luca Bruno)

South Korean gymnast Yang Hak-seon bites his gold medal during the artistic gymnastics men's apparatus finals for the vault, Aug. 6, 2012. (AP Photo/Julie Jacobson)

U.S. gymnasts McKayla Maroney, Kyla Ross, Alexandra Raisman, Gabrielle Douglas and Jordyn Wieber bite their gold medals at the Artistic Gymnastics women's team final, July 31, 2012. (AP Photo/Matt Dunham)

Venezuelan fencer Ruben Limardo samples his gold medal during a welcoming caravan in Caracas, Venezuela, Aug. 6, 2012. (AP Photo/Fernando Llano)

Tony Estanguet of France bites his Olympic gold medal after winning the final of the C-1 men's canoe slalom at Lee Valley Whitewater Center, July 31, 2012. (AP Photo/Kirsty Wigglesworth)

Kazakhstan's Alexandr Vinokourov, center, bites the gold medal while posing for photographs with Rigoberto Uran of Colombia, left, silver, and Alexander Kristoff of Norway, right, bronze, after winning the Men's Road Cycling race, July 28, 2012. (AP Photo/Christophe Ena)

China's Li Xuerui bites her gold medal during the victory ceremony of the badminton women's singles, Aug. 4, 2012. (AP Photo/Andres Leighton)

France's Yannick Agnel bites on his gold medal after winning the men's 200-meter freestyle final at the Aquatics Centre in the Olympic Park, July 30, 2012. (AP Photo/Daniel Ochoa De Olza)

South Korea's Kim Jangmi bites her gold medal as she leaves the firing range following the victory ceremony in the women's 25-meter pistol event, Aug. 1, 2012. (AP Photo/Rebecca Blackwell)

Lasse Norman Hansen, of Denmark, bites the gold medal after winning the track cycling men's omnium event in the velodrome, Aug. 5, 2012. (AP Photo/Matt Rourke)

Lithuania's Ruta Meilutyte bites her gold medal after her win in the women's 100-meter breaststroke swimming final at the Aquatics Centre, July 30, 2012. (AP Photo/Daniel Ochoa De Olza)

Great Britain's Alistair Brownlee, middle, bites the gold medal, Spain's Javier Gomez, left, the silver medal and Great Britain's Jonathan Brownlee the bronze medal in a ceremony for the men's triathlon, Aug. 7, 2012. (AP Photo/Kristy Wigglesworth)

Gold medallist China's Dong Dong, right, and and bronze medallist China's Lu Chunlong bite their medals during the men's trampoline finals, Aug. 3, 2012. (AP Photo/Gregory Bull)

Russia's Ivan Ukhov bites a his gold medal in the men's high jump during the athletics in the Olympic Stadium, Aug. 8, 2012. (AP Photo/Ben Curtis)

Germany's Kristina Vogel, right and teammate Miriam Welte, bite their gold medals after winning the women's team sprint track cycling event, Aug. 2, 2012, in London. Germany was awarded the gold medal in the women's team sprint after the Chinese riders were disqualified for a lane change in the final. (AP Photo/Matt Rourke)

Chinese gymnasts, left to right, Feng Zhe, Guo Weiyang, Chen Yibing, Zhang Chenglong and Zou Kai bite their gold medals during the medal ceremony of the Artistic Gymnastic men's team final, July 30, 2012. (AP Photo/Gregory Bull)

Norway's Eirik Veras Larsen bites the gold medal he won in the men's kayak single 1000m in Eton Dorney, near Windsor, England, Aug. 8, 2012. (AP Photo/Natacha Pisarenko)

China's Lu Xiaojun bites the gold medal after winning the men's 77-kg weightlifting competition at the 2012 Summer Olympics, Aug. 1, 2012. (AP Photo/Hassan Ammar)