***TASK*** the task is to summarize an input biomedical literature in six sentences 
    ***INPUT*** the input is a biomedical literature 
    ***OUTPUT*** the output is the summary of an input biomedical literature in six sentences 
    ***DOCUMENTATION*** 
    ***EXAMPLES*** 
    Input: Background : Patients with irritable bowel syndrome ( IBS ) often feel they have some form of dietary intolerance and frequently try exclusion diets . Tests attempting to predict food sensitivity in IBS have been disappointing but none has utilised IgG antibodies . Aims : To assess the therapeutic potential of dietary elimination based on the presence of IgG antibodies to food . Patients : A total of 150 out patients with IBS were r and omised to receive , for three months , either a diet excluding all foods to which they had raised IgG antibodies ( enzyme linked immunosorbant assay test ) or a sham diet excluding the same number of foods but not those to which they had antibodies . Methods : Primary outcome measures were change in IBS symptom severity and global rating scores . Non-colonic symptomatology , quality of life , and anxiety/depression were secondary outcomes . Intention to treat analysis was undertaken using a generalised linear model . Results : After 12 weeks , the true diet result ed in a 10 % greater reduction in symptom score than the sham diet ( mean difference 39 ( 95 % confidence intervals ( CI ) 5–72 ) ; p = 0.024 ) with this value increasing to 26 % in fully compliant patients ( difference 98 ( 95 % CI 52–144 ) ; p<0.001 ) . Global rating also significantly improved in the true diet group as a whole ( p = 0.048 , NNT = 9 ) and even more in compliant patients ( p = 0.006 , NNT = 2.5 ) . All other outcomes showed trends favouring the true diet . Relaxing the diet led to a 24 % greater deterioration in symptoms in those on the true diet ( difference 52 ( 95 % CI 18–88 ) ; p = 0.003 ) . Conclusion : Food elimination based on IgG antibodies may be effective in reducing IBS symptoms and is worthy of further biomedical research BACKGROUND The cause of irritable bowel syndrome ( IBS ) is unknown . It may follow gastroenteritis and be associated with an abnormal gut flora and with food intolerance . Our study was design ed to assess whether these factors were associated with colonic malfermentation . METHODS We carried out a crossover controlled trial of a st and ard diet and an exclusion diet matched for macronutrients in six female IBS patients and six female controls . During the final 72 h on each diet , faecal excretion of fat , nitrogen , starch , and non-starch polysaccharide NSP was measured , and total excretion of hydrogen and methane collected over 24 h in a purpose -built 1.4 m3 whole-body calorimeter . Breath hydrogen and methane excretion were then measured for 3 h after 20 g oral lactulose . FINDINGS The maximum rate of gas excretion was significantly greater in patients than in controls ( 2.4 mL/min IQR 1.7 - 2.6 vs 0.6 , 0.4 - 1.1 ) . Although total gas production in patients was not greater than in controls ( median 527 mL/24 h IQR 387 - 660 vs 412 , 234 - 507 ) , hydrogen production was higher ( 332 , 318 - 478 vs 162 , 126 - 217 , p=0.009 ) . In patients , the exclusion diet reduced symptoms and produced a fall in maximum gas excretion ( 0.5 mL/min IQR 0.3 - 0.7 ) . After lactulose , breath hydrogen was greater on the st and ard than on the exclusion diet . INTERPRETATION Colonic-gas production , particularly of hydrogen , is greater in patients with IBS than in controls , and both symptoms and gas production are reduced by an exclusion diet . This reduction may be associated with alterations in the activity of hydrogen-consuming bacteria . Fermentation may be an important factor in the pathogenesis of IBS CONTEXT Irritable bowel syndrome ( IBS ) is a common functional bowel disorder for which there is no reliable medical treatment . OBJECTIVE To determine whether Chinese herbal medicine ( CHM ) is of any benefit in the treatment of IBS . DESIGN R and omized , double-blind , placebo-controlled trial conducted during 1996 through 1997 . SETTING Patients were recruited through 2 teaching hospitals and 5 private practice s of gastroenterologists , and received CHM in 3 Chinese herbal clinics . PATIENTS A total of 116 patients who fulfilled the Rome criteria , an established st and ard for diagnosis of IBS . INTERVENTION Patients were r and omly allocated to 1 of 3 treatment groups : individualized Chinese herbal formulations ( n = 38 ) , a st and ard Chinese herbal formulation ( n = 43 ) , or placebo ( n = 35 ) . Patients received 5 capsules 3 times daily for 16 weeks and were evaluated regularly by a traditional Chinese herbalist and by a gastroenterologist . Patients , gastroenterologists , and herbalists were all blinded to treatment group . MAIN OUTCOME MEASURES Change in total bowel symptom scale scores and global improvement assessed by patients and gastroenterologists and change in the degree of interference in life caused by IBS symptoms assessed by patients . RESULTS Compared with patients in the placebo group , patients in the active treatment groups ( st and ard and individualized CHM ) had significant improvement in bowel symptom scores as rated by patients ( P=.03 ) and by gastroenterologists ( P=.001 ) , and significant global improvement as rated by patients ( P=.007 ) and by gastroenterologists ( P=.002 ) . Patients reported that treatment significantly reduced the degree of interference with life caused by IBS symptoms ( P=.03 ) . Chinese herbal formulations individually tailored to the patient proved no more effective than st and ard CHM treatment . On follow-up 14 weeks after completion of treatment , only the individualized CHM treatment group maintained improvement . CONCLUSION Chinese herbal formulations appear to offer improvement in symptoms for some patients with IBS AIM Irritable bowel syndrome ( IBS ) is a common disorder and many patients fail to find adequate relief from conventional therapies for their symptoms . This study tests the cl aim that acupuncture is effective for a majority of these patients . METHODS A prospect i ve , blinded , sham acupuncture-controlled trial of traditional Chinese acupuncture was performed at a single postgraduate teaching hospital in Europe . Sixty patients with well-established IBS were recruited . The blinded comparator was sham acupuncture administered by the second of two acupuncturists who alone was aware of the r and omization , and who otherwise followed the prescription of the first . The primary end-point was a defined fall in the symptom score at 13 wk ( by intention to treat ) . The prior expectation was a 30 % placebo response , and a response rate of 70 % from acupuncture , for which the study was adequately powered . RESULTS Patients in treated and sham groups improved significantly during the study -mean improvement in scores being equal ( minus 1.9 ) and significant for both ( P<0.05 ; one-tailed t test ) . There was a small numeric but non-significant difference between the response rate in patients receiving acupuncture ( 40.7 % ) and sham treatment ( 31.2 % ) . Several secondary end-points marginally favored active treatment , but an improved symptom score of any degree of magnitude occurred more often with sham therapy ( 65.6 % vs 59.2 % ) . For no criterion was statistical significance approached . CONCLUSION Traditional Chinese acupuncture is relatively ineffective in IBS in the European hospital setting , and the magnitude of any effect appears insufficient to warrant investment in acupuncture services CONTEXT A prior national survey documented the high prevalence and costs of  alternative medicine use in the United States in 1990 . OBJECTIVE To document trends in alternative medicine use in the United States between 1990 and 1997 . DESIGN Nationally representative r and om household telephone surveys using comparable key questions were conducted in 1991 and 1997 measuring utilization in 1990 and 1997 , respectively . PARTICIPANTS A total of 1539 adults in 1991 and 2055 in 1997 . MAIN OUTCOMES MEASURES Prevalence , estimated costs , and disclosure of alternative therapies to physicians . RESULTS Use of at least 1 of 16 alternative therapies during the previous year increased from 33.8 % in 1990 to 42.1 % in 1997 ( P < or = .001 ) . The therapies increasing the most included herbal medicine , massage , megavitamins , self-help groups , folk remedies , energy healing , and homeopathy . The probability of users visiting an alternative medicine practitioner increased from 36.3 % to 46.3 % ( P = .002 ) . In both surveys alternative therapies were used most frequently for chronic conditions , including back problems , anxiety , depression , and headaches . There was no significant change in disclosure rates between the 2 survey years ; 39.8 % of alternative therapies were disclosed to physicians in 1990 vs 38.5 % in 1997 . The percentage of users paying entirely out-of-pocket for services provided by alternative medicine practitioners did not change significantly between 1990 ( 64.0 % ) and 1997 ( 58.3 % ) ( P=.36 ) . Extrapolations to the US population suggest a 47.3 % increase in total visits to alternative medicine practitioners , from 427 million in 1990 to 629 million in 1997 , thereby exceeding total visits to all US primary care physicians . An estimated 15 million adults in 1997 took prescription medications concurrently with herbal remedies and /or high-dose vitamins ( 18.4 % of all prescription users ) . Estimated expenditures for alternative medicine professional services increased 45.2 % between 1990 and 1997 and were conservatively estimated at $ 21.2 billion in 1997 , with at least $ 12.2 billion paid out-of-pocket . This exceeds the 1997 out-of-pocket expenditures for all US hospitalizations . Total 1997 out-of-pocket expenditures relating to alternative therapies were conservatively estimated at $ 27.0 billion , which is comparable with the projected 1997 out-of-pocket expenditures for all US physician services . CONCLUSIONS  Alternative medicine use and expenditures increased substantially between 1990 and 1997 , attributable primarily to an increase in the proportion of the population seeking alternative therapies , rather than increased visits per patient BACKGROUND Irritable bowel syndrome ( IBS ) is a significant problem for primary care , as treatment options are limited and it can frequently develop into a chronic condition . Complementary and alternative medicine , including reflexology , is being turned to increasingly in an attempt to manage symptoms . There are currently no studies which address the effectiveness of reflexology for IBS . Despite this , it continues to be advocated and used . AIM To provide the first evidence on the effectiveness of reflexology in the management of the core defining symptoms of IBS . DESIGN OF STUDY A single-blind trial carried out in primary care setting s. SETTING Thirty-four participants diagnosed with IBS on the basis of the Rome Criteria . METHOD Participants were allocated to receive either a reflexology foot massage or a non-reflexology foot massage control group . RESULTS On none of the three symptoms monitored -- abdominal pain , constipation/diarrhoea , and abdominal distention -- was there a statistically or clinical ly significant difference between reflexology and control groups . CONCLUSION On the basis of these results there is nothing to suggest that reflexology produces any specific benefit for patients with IBS . There is currently no evidence to support its use . However this was one ( relatively ) small scale study ; further research that , for example , assesses the impact of therapist ( professional and lay ) versus therapy , is still needed OBJECTIVE To determine whether clinical trials originating in certain countries always have positive results . DATA SOURCES Abstract s of trials from Medline ( January 1966-June 1995 ) . STUDY SELECTION Two separate studies were conducted . The first included trials in which the clinical outcome of a group of subjects receiving acupuncture  was compared to that of a group receiving placebo , no treatment , or a nonacupuncture intervention . In the second study , r and omized or controlled trials of interventions other than  acupuncture  that were published in China , Japan , Russia/USSR , or Taiwan were compared to those published in Engl and . DATA EXTRACTION Blinded review ers determined inclusion and outcome and separately classified each trial by country of origin . DATA SYNTHESIS In the study of acupuncture  trials , 252 of 1085 abstract s met the inclusion criteria . Research conducted in certain countries was uniformly favorable to acupuncture ; all trials originating in China , Japan , Hong Kong , and Taiwan were positive , as were 10 out of 11 of those published in Russia/USSR . In studies that examined interventions other than acupuncture , 405 of 1100 abstract s met the inclusion criteria . Of trials published in Engl and , 75 % gave the test treatment as superior to control . The results for China , Japan , Russia/USSR , and Taiwan were 99 % , 89 % , 97 % , and 95 % , respectively . No trial published in China or Russia/USSR found a test treatment to be ineffect 
    Output:
    
As many of these therapies have not been subjected to controlled clinical trials , some , at least , of their efficacy may reflect the high-placebo response rate that is characteristic of irritable bowel syndrome .
There is , however , evidence to support efficacy for hypnotherapy , some forms of herbal therapy and certain probiotics in irritable bowel syndrome .
All complementary and alternative medicine is not the same and some , such as hypnotherapy , forms of herbal therapy , specific diets and probiotics , may well have efficacy in irritable bowel syndrome .