@michaeljburgess It's not just the quantity that matters, but also what we eat.A lot is happening in #microbiome research!yazio pro also tracks fiber. That should be at least 30g per day for adults. I bet you're not eating that much at the moment I've now found a breakfast that gives me a big chunk of my fiber in the morning. Then add some fruit and vegetables and the day is saved.i don't know if there are any english books on the microbiome, it's best to google it yourself.