If we eat food causing us diarrhoea, we learn to avoid it in future. Even if
others enjoy that food we still keep a distance from it. Physical diarrhoea
is easily apparent but when something such happens at mental level, it isn't
apparent. We expose ourselves to stimuli that makes our mind wild, with
desire / anger/ fear etc. Such agitation & disruption of our intentions &
life that ensues is akin to diarrhoea at mind. Just as we learn to avoid
food that cause physical diarrhoea, we need to learn to avoid stimuli that
cause mental diarrhoea.