Fructose intolerance in IBS and utility of fructose-restricted diet.
BACKGROUND
Whether dietary fructose intolerance causes symptoms of irritable bowel syndrome (IBS) is unclear. We examined the prevalence of fructose intolerance in IBS and long-term outcome of fructose-restricted diet.


METHODS
Two hundred and nine patients with suspected IBS were retrospectively evaluated for organic illnesses. Patients with IBS (Rome II) and positive fructose breath test received instructions regarding fructose-restricted diet. One year later, their symptoms, compliance with, and effects of dietary modification on lifestyle were assessed using a structured interview.


RESULTS
Eighty patients (m/f=26/54) fulfilled Rome II criteria. Of 80 patients, 31 (38%) had positive breath test. Of 31 patients, 26 (84%) participated in follow-up (mean=13 mo) evaluation. Of 26 patients, 14 (53%) were compliant with diet; mean compliance=71%. In this group, pain, belching, bloating, fullness, indigestion, and diarrhea improved (P<0.02). Of 26 patients, 12 (46%) were noncompliant, and their symptoms were unchanged, except belching. The mean impact on lifestyle, compliant versus noncompliant groups was 2.93 versus 2.57 (P>0.05).


CONCLUSIONS
About one-third of patients with suspected IBS had fructose intolerance. When compliant, symptoms improved on fructose-restricted diet despite moderate impact on lifestyle; noncompliance was associated with persistent symptoms. Fructose intolerance is another jigsaw piece of the IBS puzzle that may respond to dietary modification.
Choi
Young K
YK
Immanuel St Joseph's, Mayo Health System, Mankato, MN, USA.
Kraft
Nancy
N
Zimmerman
Bridget
B
Jackson
Michelle
M
Rao
Satish S C
SS
D000328:Adult; D000368:Aged; D001944:Breath Tests; D050528:Diet, Carbohydrate-Restricted / Q000706:statistics & numerical data*; D005260:Female; D005500:Follow-Up Studies; D005632:Fructose / Q000378:metabolism*; D005633:Fructose Intolerance / Q000178:diet therapy / Q000209:etiology* / Q000378:metabolism; D006801:Humans; D015212:Inflammatory Bowel Diseases / Q000150:complications / Q000178:diet therapy* / Q000378:metabolism; D008297:Male; D008875:Middle Aged; D012189:Retrospective Studies; D011795:Surveys and Questionnaires; D016896:Treatment Outcome
D005632:Fructose