There are certain disadvantages to running in the morning on an empty stomach. Morning running on an empty stomach is not suitable for all people, generally will trigger hypoglycemia, cause gastrointestinal discomfort and other disadvantages. 1. easy to cause hypoglycemia: generally normal people running on an empty stomach in the morning is not hypoglycemia, but for diabetic patients, hypoglycemic patients, it is not recommended to run on an empty stomach in the morning, the body’s poor self-regulation ability, easy to cause hypoglycemia. 2. cause gastrointestinal discomfort: morning running on an empty stomach will appear nausea and other gastrointestinal symptoms, especially people with poor gastrointestinal function. And running on an empty stomach will also lead to digestive disorders, running on an empty stomach will enhance the digestive function, so that the appetite after running, easy to lead to overeating, over time, will cause gastrointestinal discomfort.