I wrote this to one of the scientists who did the 'study', and I'll report back, if and when I get a reply:

Dear Dr. Sanz,

Regarding your study, please tell me what exactly did the 10 healthy people eat and drink, when still eating gluten, and what exactly did they eat and drink, while eating gluten-free, for that one month? In other words, how exactly did their gluten-free diets differ from their glutenous diets?

I'm referring to the abstract of your study, at this link:
http://journals.cambridge.org/action...ne&aid=6371220

Thank you in advance!

Sincerely,

Carol

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I'm wondering if when they ate gluten-free, that they may also have been going milk-free too, and then, they may not have been nourishing their own probiotics (probiotic bacteria like to eat milk sugar/lactose).

Also, grains may have probiotic bacteria living on them, naturally, so if they avoided all grains, it could explain why their probiotic counts decreased.

However, in any case, taking probiotics can solve that problem.