mind & bodyWellcome Collection17th century · Brussels, Belgium

A 17th-century physician decided the soul lives in the stomach

the gist

In the early 1600s, the Flemish physician Jan Baptist van Helmont spent a day working with poisonous wolfsbane and later felt that he was thinking not in his head but in his midriff. It convinced him that emotions and imagination live in the stomach, not the heart or brain. The prevailing doctrine had placed reason in the brain, feeling in the chest and basic bodily functions in the liver and digestive organs, and Descartes and Thomas Willis were then moving the soul into the head. Van Helmont argued that the stomach was home to a 'sensitive soul' that mediates between body and spirit, an idea that sounds odd but anticipates modern research on how the gut and brain communicate.

so what

Scientists now know the gut has its own nervous system of hundreds of millions of neurons, and gut bacteria influence mood. Van Helmont's view was wrong in its details, but it was right that digestion shapes feeling.

fun fact

Van Helmont is credited with coining the word 'gas' and discovered that carbon dioxide differs from air.

Wellcome Collection · CC BY 4.0