My wife has had digestive problems and nausea for several months,
following a course of antibiotics (a not uncommon occurrence,
apparently). The investigations and medications suggested by her
doctor and her specialist have either drawn blanks or had only
temporary effects, and alternative remedies such as yoghurt,
pro-biotics and acidophilus capsules have been largely ineffective.
Her specialist has now recommended an exclusion diet programme to see
if she's become sensitive to any particular food type.

The list of excluded foods includes the usual suspects such as wheat
products, diary products, etc., but also includes potatoes. We know
that glutein, lactose, etc. can cause reactions in people who are
sensitive to them, but we've never heard of potatoes causing problems.
Can someone tell us what is it about potatoes that would put them on
the exclusion list, or point us to a web site? What reactions does it
cause and is it known what causes those reactions?