The microbiome -- the kilogram of microbes that each of us carries around -- has been shown to be involved in everything from obesity and type 2 diabetes to behaviour and sexual preferences. The composition and effects of the microbiome are very active areas of research, producing results which have challenged the way we think about the evolution and interactions of organisms, including ourselves. In a paper recently published in the journal Science, researchers showed for the first time that the make up of the microbiome differs between the sexes, linking these differences to changes in hormone levels and disease resistance.
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