I don't drink a lot of coffee, especially during the warmer months. Usually it's 2 mugs a day (one at work in the morning and one after dinner) and sometimes a bit more on the weekends. I tried going decaf for about a month to see if the coffee was responsible for my [nearly 5 month] stall and it didn't have any impact at all. I think coffee is another YMMV thing. Some people are sensitive to the caffeine and should avoid it or use decaf, some don't have a problem with it at all.