Graain was very subject to rotting in the middle ages and before. One of the main problems was ergot - a fungus that had a deadly payload of ergotamines etc, LS

Graain was very subject to rotting in the middle ages and before. One of the main problems was ergot - a fungus that had a deadly payload of ergotamines etc, LSD is in there as well. It is a potent cancer causer. A huge % of grain from Roman times on was affected by ergot. https://en.wikipedia.org/wiki/Ergot https://en.wikipedia.org/wiki/Ergot