Why is it when you do a handstand after eating why don't you throw up?

When you do a handstand after eating, the contents of your stomach are generally held in place by the lower esophageal sphincter, which prevents them from moving back up into the esophagus. Additionally, the digestive process continues even in an inverted position, with gravity playing a minimal role in the stomach's ability to retain food. However, some people may still feel discomfort or nausea due to the pressure on the stomach or if they have overeaten. Overall, the body is usually able to manage the position without triggering a gag reflex.

做倒立后不会呕吐是因为人体的呕吐反射是由多种因素触发的，包括但不限于胃部的不适、内耳的平衡感受器信号以及大脑的指令。吃饭后如果做倒立，可能会感到一些不适，但并不一定会触发呕吐反射。此外，人体有一定的自我调节能力，能够适应不同的体位变化。不过，这样做可能会引起胃部不适或消化不良，还是建议在饭后一段时间再进行倒立等剧烈运动。