"Turkish 800-meter runner and Olympic hopeful Merve Aydin, 22, poses for a picture in Ankara May 23, 2012. Aydin will run at the Olympics for the first time this year. Her daily intake is 3000 kcal. Although she is rigorously training for the Games, she remains guarded on the outcome. ""It is more important for me to realize my true potential and limitations. And do the best I can. I work hard and keep a careful diet,"" she says."
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