There are a few published articles. From these and from in house studies it is clear that Caffeine consumption impacts the gut micro biome. A general increase in Bifidobacteria has been found in some studies but some of the results are conflicting,
try the following for starters -also there is some information to be found in the diabetes literature.
Cowan TE, et al J Nutr Biochem. 2014 Apr;25(4):489-95.doi: 10.1016/j.jnutbio.2013.12.009.
Ludwig IA, et al Biofactors. 2013;39(6):623-32. doi: 10.1002/biof.1124.
Jaquet M,Ret al Int J Food Microbiol. 2009 Mar 31;130(2):117-21. doi: 10.1016/j.ijfoodmicro.2009.01.011.
MurielJaquetIsabelleRochatJulieMoulinChristopheCavinRodrigoBibilon.Impact of coffee consumption on the gut microbiota: A human volunteer study. International Journal of Food Microbiology, 130,( 2), 2009, Pages 117-121
Jane Shearer.Methodological and metabolic considerations in the study of caffeine-containing energy drinks. Nutrition Reviews, Volume 72, Issue suppl_1, 1 October 2014, Pages 137–145.
L. Shen .Letter: gut microbiota modulation contributes to coffee’s benefits for nonalcoholic fatty liver disease .Aliment Pharmacol Ther 2014; 39: 1432-1442.
Tatsuya Nakayama & Kazunori Oishi .Influence of coffee (Coffea arabica) and galacto-oligosaccharide consumption on intestinal microbiota and the host responses . FEMS Microbiol Lett 343 (2013) 161–168
Silje Else Harvei .Coffee intake and the effects on intestinal inflammation, metabolic homeostasis and intestinal barrier function in mice. Master’s Thesis 2016 60 ECTS
The answer is Yes! Higher caffeine consumption is associated with increased richness and evenness of the mucosa-associated gut microbiota, and higher relative abundance of anti-inflammatory bacteria, such as Faecalibacterium and Roseburia and lower levels of potentially harmful Erysipelatoclostridium.
Article Caffeine Consumption and the Colonic Mucosa-Associated Gut M...