One person might have stronger nerves than another because she has a better stock of vitamin B-producing bacteria. Another person might be able to deal easily with bit of bread mould eaten by mistake, or yet another might have a tendency to gain weight because the ‘chubby bacteria’ in his gut feed him a bit too willingly. Science is just beginning to understand that each of us is an entire ecosystem. Microbiome research is still young, complete with wobbly milk teeth and short pants.
