Two New York City Marathon champions both fuel up on porridge. Here's why it's such a beloved food for winning a big race.

Elsa/Getty Images Mary Keitany and David Weir have both won the New York City Marathon. Keitany has won the 26.2-mile race four times, including last year, while Weir bested the wheelchair division once, in 2010. Both will be back in the streets of New York Sunday, racing through all 5 boroughs, and hoping to clinch another win. They each told Insider their preferred race fuel is warm porridge, a heart-healthy staple that provides runners with key vitamins and minerals, while also releasing a sl...