Comment on "Seasonal cycling in the gut microbiome of the Hadza hunter-gatherers of Tanzania"

In a recent paper, Smits et al. ( Science , 25 August 2017, p. 802) report on seasonal changes in the gut microbiome of Hadza hunter-gatherers. They argue that seasonal volatility of some bacterial taxa corresponds to seasonal dietary changes. We address the authors9 insufficient reporting of relevant data and problematic areas in their assumptions about Hadza diet that yield inconsistencies in their results and interpretations.