‘Bacteria' just make me think of diseases, but many actually keep us nice and healthy. Microbiologists in Colorado recently found that your diet affects the quantity and kind of bacteria swimming round your guts. What surprised them was how quickly this can change.
Two groups of people, one fed on animal-based food, the other on plant-based food, had their poo analysed (well someone had to do it!). Researchers saw populations of bacteria change in just a few days, depending on what food people ate.
This research appears in the 11 December 2013 issue of Science, the journal of AAAS, the non-profit society.