This important paper increased our scientific understanding of the mechanism by which a host's circadian clock can affect metabolism and health. Leone, et al. showed that both gut microbiota composition and metabolite production fluctuated daily in mice and that these changes were associated with host circadian rhythms and were modifiable by diet.

Microbes in the gut produce a huge range of metabolites, which affect various processes in the host. Knowledge about the metabolome is limited by current experimental and computational tools, but even now, interconnections are emerging between the microbiome, the metabolome, and immunological reponses -- for instance, the possible role of metabolites in immune system pattern recognition.

As MyNewGut, a research initiative involving thirty organizations from fifteen countries, continued to carry out its research program on prebiotic fibres and the gut microbiota, project participants held a workshop before the International Dietary Fibre Conference 2015 in Paris.

Liping Zhao and colleagues, in their recent paper on a dietary intervention for simple and genetic obesity, discussed evidence for the existence of gut microbiota 'guilds': bacterial genomes within the gut ecosystem that responded to the dietary intervention as a group.

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