Why would anyone sbe offended by this question? Silly!
I used decaff, coffee at Borders, for about 2 years. Didn't detect a whole lotta diference really. What made the greatest diffference in taste and still does is the milk type used. I cannot stand coffee with anything less than full fat milk, it just makes it too bitter.
After 2 years I realized that the switch to decaff hadn't made any change to my mood swings and anxiety and switched right back to the caffeinated variety. I figured: what the heck!!
Clare