Coffee is particularly bad for your kidneys - along with red wine, another of my favourite vices I need to cut back on I have read that caffeine is the main ingredient in coffee to do harm, particularly to the nervous system, however decaf is not that much better from the looks of things: <a href="http://www.buzzle.com/articles/is-decaffeinated-coffee-bad-for-you.html">http://www.buzzle.com/articles/is-decaffeinated-coffee-bad-for-you.html</a> (and it still contains up to 3% of the ca