Have you had coffee that tasted funny and made you feel a little strange for no apparent reason? I had this problem from time to time, and usually I could link it to a coffee maker that hadn’t been properly cleaned. Yours truly at Top Brew:
While coffee brewed from roasted beans does have some antibacterial action due to its acidity, there is research which shows that it is only about 50% effective in killing bacteria, such as Staphylococcus aureus and Streptococcus mutans, and molds.
Running hot water through the machine isn’t enough to clean out the bacteria, either. Water heated in the coffee maker — even the percolator types — is not hot enough to kill most germs. Water needs to reach the boiling point and continue boiling for a full minute to be certain it’s killing most harmful contaminants.