Big thanks to Matt Laye for answering nutrition questions from the New York Flyers‘ Marathon Training Program. Members of the group submitted their questions as they prepare for their fall marathons.
MTP: I have been throwing up and feeling sick in my last two marathons after mile 17. I drink water every couple miles but i start throwing up in the later stages. I take GU every couple miles that I take in training as well.
Matt: A couple things could be going on. 1) You may be drinking and eating TOO much. 2) You may be running too fast for your fitness or much faster than your normal training. Each of those could cause your body to divert blood from your stomach to your muscles, which can lead to nausea.