Kathy replied: "Studies have shown that 2 8-oz cups per day can decrease your chances of getting pregnant, although I don't know whether any studies have been done w/ IVF patients. It has also been linked to increased chances of miscarriage. Another big concern is that the caffeine could affect an embryo's development, especially in the first trimester when the nervous system/brain are forming (but later, too, as the lungs, etc. develop). Depending on where you are in your IVF cycle, you may have time to wean off gradually. I did this last summer before my IVF cycle. When I tried to quit cold-turkey, I was not able to function at all--ultra cranky, extremely muddled thinking, extreme lethargy, etc. I had to measure how much I drank and gradually decrease the amount I allowed myself. You will have to find out through trial and error how much and how quickly you can decrease your consumption. I could only handle decreasing by about 3 oz at a time, then keeping that level for about a week before decreasing again. Some people find it easier to drink 75% reg/25% decaf and gradually increase the amount of decaf. Keep in mind that decaf does have a little bit of caffeine, too, but not nearly as much as regular. If you go to a restaurant you could order hot choc (or decaf) instead. The warmth and consistency will be similar and it does have a small amount of caffeine, which shouldn't be harmful. If I'm feeling tired & have to go to a social function, I will allow myself 8 oz of weakly brewed coffee. I've actually had doctors tell me that one cup a day shouldn't be an issue (as long as I keep in mind any other sources of caffeine, like chocolate, tea, etc.), so I figure that I'm still well under that."