Daniel Friedberg, a gastrointestinal specialist at Columbia University Medical Center, said: When people say they feel abdominal distension, its usually caused by air rather than food. The colon in the human body is like a balloon. It can be big or small. When it enters a lot of air, it will feel abdominal distension.
In addition, eating fatty foods before running may cause stomach and intestinal discomfort, because such foods take a long time to digest. Drinking sugary drinks or eating high-fiber foods can also cause abdominal distension within a short period of time from the start of running.
Rizzo said that the runners body not only needs to adapt to the training process, but also the stomach needs to adapt to the process. The stomach is a muscle that requires training to adapt to the ups and downs of running. Even experienced runners sometimes suffer from gastrointestinal discomfort. Especially eating unfamiliar food, the test of the intestines and stomach is greater. Rizzo said.