Most sources list it as 0 or 1 calories. Additionally considering that caffeine may increase your RMR ("Resting Metabolic Rate") by 3% or more[0][1], if you wan

Most sources list it as 0 or 1 calories. Additionally considering that caffeine may increase your RMR ("Resting Metabolic Rate") by 3% or more[0][1], if you want to be "precise" it may be more accurate to say that black coffee contains negative calories. So how precise do you need it to be? 0, 1, <5, or -1, -5 calories? Or is this just pedantic nitpicking? [0] https://www.ncbi.nlm.nih.gov/pubmed/7486839 https://www.ncbi.nlm.nih.gov/pubmed/7486839 [1] https://www.ncbi.nlm.nih.gov/pubmed/2912010 https://www.ncbi.nlm.nih.gov/pubmed/2912010