Plants contain defense chemicals such as saponins and coumarins that can be problematic for humans.

“plants put defense chemicals in leaves like kale or spinach they put defense chemicals in roots and stems and bark even cinnamon a mainstream spice has things like coumarins in it which can be problematic for humans”

“we know that in the skin of the banana there's a lot of saponins and i think even an unripe banana you're gonna find more defense chemicals from the plant”

“plants put defense chemicals in leaves like kale or spinach they put defense chemicals in roots and stems and bark even cinnamon a mainstream spice has things like coumarins in it which can be problematic for humans”