Gut bacteria are on a circadian rhythm and their species abundance varies depending on the time of day and whether the animal is obese.

“The gut microbiome is also...well, bacteria are living organisms and they are also on a circadian rhythm. And what I found very interesting from some of your recent work is that you showed that different bacterial species within the gut, at least in a mouse also seemed to, you seemed to have more of these species during certain times of the day and less during certain times of the day. And this was different in obese animals versus, you know, non-obese animals or...”