Yes, on most days I have no caffeine. I frequently go 2-3 weeks without taking any caffeine at all except for, say, a fun-sized dark chocolate bar. I do not drink soda, take caffeniated pills, drink office coffee, or have access to other popular surrepetitious sources of caffeine, so it is unlikely that I am in denial about my caffeine consumption.
I do not have an objective measure of alertness, but I have been successfully confused by what appeared to be aytpical levels of alertness after misestimating the amount of caffeine in, e.g., a Grande Starbucks Frappucino (~120 mg vs. my estimate of 50 mg), gone back and checked the actual caffeine level, and found that it predicted my past alertness better than my estimated caffeine level. This happened twice with two different types of caffeniated beverages, both at times when I was habitually using caffeine at roughly the same dosages per day as the beverages in question.
Yes, on most days I have no caffeine. I frequently go 2-3 weeks without taking any caffeine at all except for, say, a fun-sized dark chocolate bar. I do not drink soda, take caffeniated pills, drink office coffee, or have access to other popular surrepetitious sources of caffeine, so it is unlikely that I am in denial about my caffeine consumption.
I do not have an objective measure of alertness, but I have been successfully confused by what appeared to be aytpical levels of alertness after misestimating the amount of caffeine in, e.g., a Grande Starbucks Frappucino (~120 mg vs. my estimate of 50 mg), gone back and checked the actual caffeine level, and found that it predicted my past alertness better than my estimated caffeine level. This happened twice with two different types of caffeniated beverages, both at times when I was habitually using caffeine at roughly the same dosages per day as the beverages in question.
This is a sufficient answer to my comment as well.