Recently came across research from the author of this book www.amazon.co.uk/gp/product/customer-reviews/095309216X/ref=cm_rev_next/026-8268825-1892421?i e=UTF8&customer-reviews.sort%5Fby=-SubmissionDate&n=266239&s=books&customer-reviews.start=11
and while it looks at first like just another crank there does seem to be some scientific basis behind it.
It would do no harm to try drinking a bit more water. Don't expect it to sort out the nut allergy but may help with my son's flaky scalp and my brothers asthma.