Andii, I tried not drinking coffee for a month and drinking coffee for a month.

First I started drinking coffee last March, then I stopped last April. No change. I just bought some Greek coffee(frappe) and that's why I remembered it.

I think if you experience some kind of change it will probably be a result of placebo effect. That's just my belief though.

However, I believe coffee is not good for general health(except maybe if you know where it comes from). I prefer a natural juice made of fruits instead.