Breaking the Vicious Cycle advocates a diet called the Specific Carbohydrate Diet (SCD). That’s not the same as a low FODMAPs diet. There’s enough variation from person to person that no particular diet works broadly enough to become a general recommendation. Some folks do seem do get a lot of benefit from a diet they work out for themselves, though. I’ve personally tried several and haven’t seen any benefit. As MCH says, giving up a pleasurable diet is a big deal, so it needs to have a substantial benefit to be worth doing.