p We consume all sorts of things before really knowing how they’re going to affect us, including probiotics and dietary supplements.

For instance, vitamin A might kill a bacteria hypothesized to promote childhood growth.

How supplements impact our microbiome is important, not so much for dodos taking fists full of pills to “stay healthy” as for folks suffering from malnutrition, especially in lower-income countries.

But in a new study in mice, a vitamin A deficiency allowed one potentially beneficial species of gut bacteria to flourish.

The gut microbiome is simply the slew of bacteria living inside our guts that play a role in our digestion.

A team of American researchers has been studying the effects of diet on the microbiome for a while, by raising human bacterial colonies inside mice guts.

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