Charmion, a few of my friends have been put on a diet called FODMAPS, which cuts out all beans.

Fermentable: foods which do not fully digest/absorb in the intestine so ferment in the large bowel.
Oligosaccharides: there are two groups of oligosaccharides that cause symptoms; Fructans and Galactooligosaccharides. These are poorly absorbed in all people as we do not have the ability to digest them in
the small intestine.
Fructans are also known as fructo-oligosaccharides (FOS) and are chains of the sugar fructose of different lengths. Main dietary sources of these are wheat products (bread / breakfast cereal / pasta), some vegetables (e.g. onion, garlic, artichoke) and as an ingredient added to some processed foods as a
prebiotic (e.g. FOS, oligofructose or inulin).
Galacto-oligosaccharides (GOS) are chains of sugar galactose. The main dietary sources are pulses, beans, legumes and cashew or pistachio nuts.
Disaccharides: Lactose is a sugar found in all animal milks. Milk and yogurt are main sources of lactose
Monosaccharides: Fructose is a simple sugar but in excessive amounts may be poorly absorbed by some.
Polyols: Polyols are sugar alcohols such as sorbitol, mannitol and xylitol. These are poorly absorbed in most people. These occur naturally in some fruits and vegetables, but are also used as artificial sweeteners in sugar free chewing gum, mints, and other low calorie or sugar free products.

The diet seems like a nightmare to me, but most of the people who are on it seem to choose some parts of it and not bother about others.