That is a tricky one, especially since most people just try to avoid it! While we are on the topic of caffeine, I wanted to note that after detoxing my body so much through this diet over the months, now when I take Midol Menstrual pills to combat my severe cramps, they keep me up all night from the caffeine they contain! No lie, last three periods, I will not sleep for the entire night, or will get something like 2 hours in. I finally made the connection last night. makes me all jittery too. Looks like I have to find a new way to combat cramps!