norah o'donnell ran some doestions by her. >> look at the emotion of shalane flanagan. >> reporter: whenwlanagan won the new york city marathon last november, she punctuated the moment with the grit and swagger befitting of the streets she'd just conquered. >> you can't take this away from me, this is my moment.>>eporterg moment, as flanagan, at the age nf 36, became the first american woman in 40 years to break the tape in new york. this summer, she announced she is coming back for more. you're back in new york! e every time i come here, i just feel like this magical sense, like, it incites this excitement in me, and this cossion for running, so i just feel like i had to come back. >> reporter: do you think you are born an elite runner? a> i always say you make puurself a marathoner, or a runner. you put in the work and you are rewarded. >> reporter: those rewards are hard-earned, and they require a concentration on diet. >> we grew up in a culture, at least in college-- back at marolina, you know, that fat would make you fat. so, we were eating everything t e-fat. and little did we kno

norah o'donnell ran some questions by her. >> look at the emotion of shalane flanagan -- >> reporter:n shalane flanagan won the new york city marathon last summer, she punctuated with the grit and swagger of the street she just conquered. >> you can't take this away from me, this is my moment. >> reporter: a history making moment as flanagan at the age of 36 became the first american woman in 40 years to break the tape in new york. this summer she announced she's coming back for more. >>> you're back in new york. >> every time i come here i feel like this magical sense incites the excitement in me and the passion for running so i had to come back. >> reporter: do you think you're born an elite runner? yourself a marathoners or runner. you're rewarded. >> reporter: it's hard earned and concentrated on diet. >> we grew up in a come tour of college in carolina fat would make you fat. so we were eating everything low fat. little did we know we were eating more sugar and processed foods. >> reporter: with the help of her best friend nutritionist, she has replaced processed foods with healt