My n=2 (Mom and I) indicates that you might want to look at it yourself before you accept the study. Both of us cut back on our coffee (I give it up periodically until life intervenes) and found that our digestion improved. Later, both of us cut wheat (me being primal, her just cutting wheat) and our digestion improved rather massively. So- I don't know if it's a cross-reactivity thing or just coincidence- but it is possible that it's an issue.