Also, many GAN patients spontaneously vomit within 10 minutes of eating. A Neuro-GI specialist at Children’s of Boston told me this happens because when you put food in your mouth and begin chewing, the central nervous system (CNS) sends a message to the stomach, telling it to expand to receive the food. This signaling is likely impaired in GAN. I told this MD that GAN patients seem to outgrow the vomiting. He replied saying, when kids are younger, if their stomach hurts, they will vomit to feel better. When they get older, they realize if they wait 15 minutes, the discomfort goes away and do not vomit.