The gold medalist is worried he won't be able to reunite with his family in Portland.

Athletes are acutely aware of the power that food has over the human body. When they're not training or competing, many of them are doing their part to make sure that no one is limited by hunger, malnutrition, or obesity-related health problems.

Olympic Stadium, London, August 4, 2012. Minutes before the race of my life, the finals of the men's 10,000 meters. I wasn't running. I was a spectator. Below, taking their places, were two runners I'd spent years coaching. I couldn't help but marvel at the peace I felt inside.