Why Are Intestines Called Our Second Brain?
You've probably heard that intestines are referred to as our second brain. The reason for this is that the intestines are an organ with its own nervous system, closely communicating with our brain. The nervous system in the intestines is as complex as the one in our brain, containing approximately 100 million neurons. These neurons perform various functions, from controlling intestinal movements to regulating the immune system and even influencing our mood.