Does eating blueberries cause black stool?

If you eat blueberries properly

, they contain anthocyanins, vitamins and other nutrients that can usually be digested and absorbed by the body. However, if you consume too much blueberries, excessive accumulation of anthocyanins in the body will cause black stool. At the same time, excessive intake of blueberries will cause stomach inflammation, mucosal damage and bleeding, which will lead to changes in stool color

.