I remember reading how if you steep tea for too long a lot of the toxins and stuff seeps out and also a lot of tea is grown in areas where the soil contains lead and gets into the tea which sucks because how can you know
So like cooking, if you are making a recipe of something new it's important to follow the recipe to know how it tastes then next time you know what to tweak to make it taste more like what you like
why dont they call it the cow flu then