Morbid ObesityNCT01856465
Intestinal Microbiota and NAFLD Pre and Post Bariatric Surgery
An observational study of Morbid Obesity and Non-alcoholic Fatty Liver Disease, run by Johane Allard at 1 site in Canada.
Trial summary
Non-alcoholic fatty liver disease (NAFLD) includes benign hepatic simple steatosis (SS) and steatohepatitis (NASH), which is characterised by inflammation leading to fibrosis and cirrhosis. Read more about this study
- Who is it for?
- Ages 18 years and older
- Conditions the study is for
- Morbid Obesity, Non-alcoholic Fatty Liver Disease
- How many people
- 120 participants
- Where
- 1 siteCanada
- Study dates
- Jun 2013to 30 Aug 2023
- Phase
- Observational
- Are there results?
- None posted in the registry
Key requirements
Who can take part, as listed by the sponsor. Only the study team can confirm whether you are eligible, so take this list to your doctor.
- Ages 18 years and older
- All sexes
- No healthy volunteers
- Adult, Older adult
Study population: NAFLD is the hepatic manifestation of the metabolic syndrome, and the prevalence is 74-98% in morbidly obese individuals. The aim of this study is to examine the role of intestinal microbiota (IM) in non-alcoholic fatty liver disease (NAFLD) in morbidly obese patients undergoing Roux-en-Y gastric bypass surgery. Alterations of the human gut flora (intestinal microbiota) will be determined before and after surgery in realtion with the change of liver histology.
Who may be able to join
- BMI>40 kg/m2 or BMI>35-40 kg/m2 with severe weight loss comorbidities
- Male or female, equal or over 18 years of age
- Alcohol consumption is leass than 20 g/d
Who cannot join
- No diagnosis of NAFLD
- Having liver disease of other etiology
- Having advance liver disease
- Having abnormal coagulation or other reason contraindicating a Liver Biopsy
- On medication known to precipitate steatohepatitis 6 months prior to entry
- On regular intake of non-steroidal anti-inflammatory drugs, prebiotics, probiotics and antibiotics, ursodeoxycholic or any experimental drug in the 3 months prior to study entry
Show all 9Show fewer
- Having type-1 diabetes, chronic gastrointestinal diseases, previous gastrointestinal surgery modifying the anatomy (prior to bariatric surgery)
- Smoking
- Pregnancy or Breastfeeding
Trial locations and contacts
1 site in 1 country.
About this study
Official title: Role of Intestinal Microbiota in Non-alcoholic Fatty Liver Disease Pre and Post bAriatric Surgery
Non-alcoholic fatty liver disease (NAFLD) includes benign hepatic simple steatosis (SS) and steatohepatitis (NASH), which is characterised by inflammation leading to fibrosis and cirrhosis. NAFLD is the hepatic manifestation of the metabolic syndrome, and the prevalence is 74-98% in morbidly obese individuals undergoing bariatric surgery. Although steatosis improves post bariatric surgery, hepatic inflammation and fibrosis do not consistently improve. Alterations of the human gut flora (intestinal microbiota; IM) may play a role. One mechanism linking IM to obesity, insulin resistance (IR), and NAFLD is through translocation of bacterial lipopolisaccharide (LPS=endotoxin) into the blood stream (=endotoxemia), causing chronic inflammation. Morbidly obese subjects have different IM compared to lean controls, and the IM structure is significantly altered after bariatric surgery, probably due to a combination of anatomic changes, diet, and weight loss. For example, the ratio of Firmicutes/Bacteroidetes may be lower in obese subjects compared to lean controls and lower numbers of Faecalibacterium prausnitzii were reported in some obese subjects before bariatric surgery, which increased 3 months post-surgery. This is of interest since, in animal studies, low abundance of F. prausnitzii, a butyrate producing bacterium, is associated with increased intestinal permeability, endotoxemia, and inflammation. To our knowledge, only two studies are available describing IM in patients pre and post bariatric surgery, and no data have been published on the relationship between IM and NAFLD in these patients.
Read the detailed description
Study Design: A. Cross-sectional study: Sixty patients with morbid obesity undergoing bariatric surgery diagnosed with NAFLD on liver biopsy (30 SS, 30 NASH). Main hypothesis: The ratio of Firmicutes/Bacteroidetes is higher in stool samples from morbidly obese subjects with NASH compared to SS. Other differences in IM composition exist. Objective: to compare bacterial dynamics using Illumina technology to assess the IM. The relative abundance of the dominant fecal microorganisms (including Firmicutes, Archaea, Bacteroides, Bifidobacteria, Mollicutes, Enterobacteriaceae, Clostridia clusters, F. prausnitzii, Roseburia, and Lactobacilli) will also be assessed by real-time PCR. Sub-hypotheses: In NASH compared to SS, there will be: a) lower fecal butyrate concentration; b) higher endotoxin and other inflammatory markers (TNF-α, IL-6) in plasma. Potential covariates assessed: small intestinal bacterial overgrowth (SIBO), measured by glucose hydrogen breath test (GHBT), which can contribute to endotoxemia and inflammation; IR, diabetes status, lipid profile, plasma vitamin E, liver enzymes, anthropometry, food intake, physical activity and environmental factors.
- Prospective cohort study: Patients undergoing bariatric surgery with either SS or NASH (up to 60 of them recruited from Part A) will be followed prospectively over 12 months to assess changes in the IM and liver histology. Goal is to have 60 subjects who complete the study with a 2nd liver biopsy. Main Hypothesis: In morbidly obese patients with NAFLD (SS or NASH), changes in IM post bariatric surgery will be associated with changes in liver histology. Specifically, an increased number of F. prausnitzii in feces with be associated with improvement in liver histology while a reduction will be associated with deterioration of liver histology. Objective: To correlate changes in liver histology (NAFLD activity score [NAS], inflammation, fibrosis, steatosis) between 0 and 12 months with changes in F. prausnitzii. Other changes of the fecal IM community structure, fecal short chain fatty acids (including butyrate), plasma endotoxin, inflammatory markers (TNF-α, IL-6) and SIBO will also be assessed, in addition to diet, activity, weight change, improvement of diabetes and plasma vitamin E. Secondary hypotheses: Increased number of F. prausnitzii in feces will be associated with increased fecal butyrate, lower serum endotoxin and lower inflammatory markers (TNF-α, IL-6) in plasma.
Significance: In humans with morbid obesity and NAFLD undergoing bariatric surgery, very little data are available on IM and its metabolic effect and contribution to NAFLD. These studies will add more information regarding the role of IM and its effect on potential mechanisms contributing to NAFLD. It will also provide us with pilot data for future intervention studies assessing the potential use of pre- or probiotics for NAFLD in morbidly obese subjects in the setting of bariatric surgery.
- Conditions
- Morbid Obesity, Non-alcoholic Fatty Liver Disease
- Keywords
- Bariatric surgery, NAFLD, Steatohepatitis, Simple Steatosis, Intestinal Microbiota
- Medical subject headings
- Obesity, Morbid, Non-alcoholic Fatty Liver Disease, Fatty Liver
What participants receive
What participants receive. In a randomised study each person is assigned to one group by chance.
| Study group | Role | What they receive |
|---|---|---|
| Bariatric surgery of morbid obese | Morbid obese patient who undergo Bariatric surgery with NAFLD (NASH or SS) status |
What is being measured
The primary outcome is the main question the study is designed to answer.
Firmicutes/Bacteroides ratio in feces
16S rRNA sequencing will be performed on the Ion Torrent platform
Measured: Baseline, 6, 12 months
Secondary outcomes (4)
Overall microbiota composition, amount of selected groups of microorganisms and concentration of Short Chain Fatty Acid (SCFA) in stool sample
Lower fecal butyrate concentration in NASH vs SS
Measured: 8 months
The amount of endotoxin, TNF-alfa and IL-6 in plasma/serum
Higher plasma endotoxin and pro-inflammatory markers (TNF-alfa and IL-6) in NASH vs SS.
Measured: 8 months
The change in inflammation, fibrosis, steatosis in liver histology
Change in the number of F. prausnitzii in stool between baseline and 12 months related with the change in liver histology
Measured: 12 months
NAFLD activity score
NAFLD Activity score (Kleiner) on liver histology
Measured: baseline, 12 months
Timeline
From the start of the study to its completion; the mark is today. Estimated dates are the sponsor’s plan.
- First posted17 May 2013 (estimated)
- Study startJun 2013
- Primary completion30 Jun 2022
- Study completion30 Aug 2023 (estimated)
Resources
- Official record on ClinicalTrials.govThe registry entry this page is built from, with its full change history.
- Publications (12)Papers the sponsor has linked to this study.
- Other trials for Morbid ObesityStudies of the same condition, open and under way.
- What the trial phases meanHow a treatment moves from first tests in people to approval.
More details
For doctors and researchers: how the study is designed, who runs it, and its registry IDs.
Study design
- Study type
- Observational
- Observational model
- Cohort
- Time perspective
- Prospective
- Enrolment
- 120 participants (estimated)
Sponsor and investigators
- Lead sponsor
- Johane Allard
- Sponsor type
- University, hospital or other
- Collaborators
- Canadian Institutes of Health Research (CIHR)
- Responsible party
- Sponsor-investigator, Johane Allard, University Health Network, Toronto
- Investigators
- Johane Allard, MD. FRCPC, Principal investigator, University Health Network, Toronto
IDs, dates and publications
- ClinicalTrials.gov ID
- NCT01856465
- Sponsor's protocol ID
- 13-6115-A
- Status last verified
- Nov 2022
- First submitted
- 14 May 2013
- Last updated
- 2 Nov 2022
- Results posted
- No
- Data monitoring committee
- No
Publications
Mouzaki M, Comelli EM, Arendt BM, Bonengel J, Fung SK, Fischer SE, McGilvray ID, Allard JP. Intestinal microbiota in patients with nonalcoholic fatty liver disease. Hepatology. 2013 Jul;58(1):120-7. doi: 10.1002/hep.26319. Epub 2013 May 14.
PubMed 23401313Musso G, Gambino R, Cassader M. Recent insights into hepatic lipid metabolism in non-alcoholic fatty liver disease (NAFLD). Prog Lipid Res. 2009 Jan;48(1):1-26. doi: 10.1016/j.plipres.2008.08.001. Epub 2008 Sep 9.
PubMed 18824034Bellentani S, Scaglioni F, Marino M, Bedogni G. Epidemiology of non-alcoholic fatty liver disease. Dig Dis. 2010;28(1):155-61. doi: 10.1159/000282080. Epub 2010 May 7.
PubMed 20460905Mathurin P, Hollebecque A, Arnalsteen L, Buob D, Leteurtre E, Caiazzo R, Pigeyre M, Verkindt H, Dharancy S, Louvet A, Romon M, Pattou F. Prospective study of the long-term effects of bariatric surgery on liver injury in patients without advanced disease. Gastroenterology. 2009 Aug;137(2):532-40. doi: 10.1053/j.gastro.2009.04.052. Epub 2009 May 4.
PubMed 19409898Yang SQ, Lin HZ, Lane MD, Clemens M, Diehl AM. Obesity increases sensitivity to endotoxin liver injury: implications for the pathogenesis of steatohepatitis. Proc Natl Acad Sci U S A. 1997 Mar 18;94(6):2557-62. doi: 10.1073/pnas.94.6.2557.
PubMed 9122234da Silva VR, Moreira EA, Wilhelm-Filho D, de Miranda JX, Beninca JP, Vigil SV, Moratelli AM, Garlet TR, de Souza Meirelles MS, Vannucchi H, Frode TS. Proinflammatory and oxidative stress markers in patients submitted to Roux-en-Y gastric bypass after 1 year of follow-up. Eur J Clin Nutr. 2012 Aug;66(8):891-9. doi: 10.1038/ejcn.2012.17. Epub 2012 Feb 22.
PubMed 22353926Musso G, Gambino R, Cassader M. Emerging molecular targets for the treatment of nonalcoholic fatty liver disease. Annu Rev Med. 2010;61:375-92. doi: 10.1146/annurev.med.60.101107.134820.
PubMed 20059344Frazier TH, DiBaise JK, McClain CJ. Gut microbiota, intestinal permeability, obesity-induced inflammation, and liver injury. JPEN J Parenter Enteral Nutr. 2011 Sep;35(5 Suppl):14S-20S. doi: 10.1177/0148607111413772. Epub 2011 Aug 1.
PubMed 21807932Spencer MD, Hamp TJ, Reid RW, Fischer LM, Zeisel SH, Fodor AA. Association between composition of the human gastrointestinal microbiome and development of fatty liver with choline deficiency. Gastroenterology. 2011 Mar;140(3):976-86. doi: 10.1053/j.gastro.2010.11.049. Epub 2010 Dec 1.
PubMed 21129376Ley RE, Turnbaugh PJ, Klein S, Gordon JI. Microbial ecology: human gut microbes associated with obesity. Nature. 2006 Dec 21;444(7122):1022-3. doi: 10.1038/4441022a.
PubMed 17183309Turnbaugh PJ, Ley RE, Mahowald MA, Magrini V, Mardis ER, Gordon JI. An obesity-associated gut microbiome with increased capacity for energy harvest. Nature. 2006 Dec 21;444(7122):1027-31. doi: 10.1038/nature05414.
PubMed 17183312Duncan SH, Belenguer A, Holtrop G, Johnstone AM, Flint HJ, Lobley GE. Reduced dietary intake of carbohydrates by obese subjects results in decreased concentrations of butyrate and butyrate-producing bacteria in feces. Appl Environ Microbiol. 2007 Feb;73(4):1073-8. doi: 10.1128/AEM.02340-06. Epub 2006 Dec 22.
PubMed 17189447
Study at a glance
From the registry record, last updated by the sponsor on 2 Nov 2022. Recruitment status is as the sponsor reported it: confirm with the study team.
- Official title
- Role of Intestinal Microbiota in Non-alcoholic Fatty Liver Disease Pre and Post bAriatric Surgery
- ClinicalTrials.gov ID
- NCT01856465
- Acronym / sponsor ID
- 13-6115-A
- Conditions
- Morbid Obesity, Non-alcoholic Fatty Liver Disease
- Keywords
- Bariatric surgery, NAFLD, Steatohepatitis, Simple Steatosis, Intestinal Microbiota
- Study type
- Observational
- Recruitment status
- Unknown status
- Enrolment
- 120 participants (estimated)
- Lead sponsor
- Johane AllardUniversity, hospital or other
- Collaborators
- Canadian Institutes of Health Research (CIHR)
- Study start
- Jun 2013 (actual)
- Primary completion
- 30 Jun 2022 (actual)
- Study completion
- 30 Aug 2023 (estimated)
- First posted
- 17 May 2013 (estimated)
- Results
- Not posted in the source record
Clinical summary
The research question as the sponsor registered it. This describes what the study plans to test, not what it found.
Non-alcoholic fatty liver disease (NAFLD) includes benign hepatic simple steatosis (SS) and steatohepatitis (NASH), which is characterised by inflammation leading to fibrosis and cirrhosis. NAFLD is the hepatic manifestation of the metabolic syndrome, and the prevalence is 74-98% in morbidly obese individuals undergoing bariatric surgery. Although steatosis improves post bariatric surgery, hepatic inflammation and fibrosis do not consistently improve. Alterations of the human gut flora (intestinal microbiota; IM) may play a role. One mechanism linking IM to obesity, insulin resistance (IR), and NAFLD is through translocation of bacterial lipopolisaccharide (LPS=endotoxin) into the blood stream (=endotoxemia), causing chronic inflammation. Morbidly obese subjects have different IM compared to lean controls, and the IM structure is significantly altered after bariatric surgery, probably due to a combination of anatomic changes, diet, and weight loss. For example, the ratio of Firmicutes/Bacteroidetes may be lower in obese subjects compared to lean controls and lower numbers of Faecalibacterium prausnitzii were reported in some obese subjects before bariatric surgery, which increased 3 months post-surgery. This is of interest since, in animal studies, low abundance of F. prausnitzii, a butyrate producing bacterium, is associated with increased intestinal permeability, endotoxemia, and inflammation. To our knowledge, only two studies are available describing IM in patients pre and post bariatric surgery, and no data have been published on the relationship between IM and NAFLD in these patients.
Detailed description
Study Design: A. Cross-sectional study: Sixty patients with morbid obesity undergoing bariatric surgery diagnosed with NAFLD on liver biopsy (30 SS, 30 NASH). Main hypothesis: The ratio of Firmicutes/Bacteroidetes is higher in stool samples from morbidly obese subjects with NASH compared to SS. Other differences in IM composition exist. Objective: to compare bacterial dynamics using Illumina technology to assess the IM. The relative abundance of the dominant fecal microorganisms (including Firmicutes, Archaea, Bacteroides, Bifidobacteria, Mollicutes, Enterobacteriaceae, Clostridia clusters, F. prausnitzii, Roseburia, and Lactobacilli) will also be assessed by real-time PCR. Sub-hypotheses: In NASH compared to SS, there will be: a) lower fecal butyrate concentration; b) higher endotoxin and other inflammatory markers (TNF-α, IL-6) in plasma. Potential covariates assessed: small intestinal bacterial overgrowth (SIBO), measured by glucose hydrogen breath test (GHBT), which can contribute to endotoxemia and inflammation; IR, diabetes status, lipid profile, plasma vitamin E, liver enzymes, anthropometry, food intake, physical activity and environmental factors.
- Prospective cohort study: Patients undergoing bariatric surgery with either SS or NASH (up to 60 of them recruited from Part A) will be followed prospectively over 12 months to assess changes in the IM and liver histology. Goal is to have 60 subjects who complete the study with a 2nd liver biopsy. Main Hypothesis: In morbidly obese patients with NAFLD (SS or NASH), changes in IM post bariatric surgery will be associated with changes in liver histology. Specifically, an increased number of F. prausnitzii in feces with be associated with improvement in liver histology while a reduction will be associated with deterioration of liver histology. Objective: To correlate changes in liver histology (NAFLD activity score [NAS], inflammation, fibrosis, steatosis) between 0 and 12 months with changes in F. prausnitzii. Other changes of the fecal IM community structure, fecal short chain fatty acids (including butyrate), plasma endotoxin, inflammatory markers (TNF-α, IL-6) and SIBO will also be assessed, in addition to diet, activity, weight change, improvement of diabetes and plasma vitamin E. Secondary hypotheses: Increased number of F. prausnitzii in feces will be associated with increased fecal butyrate, lower serum endotoxin and lower inflammatory markers (TNF-α, IL-6) in plasma.
Significance: In humans with morbid obesity and NAFLD undergoing bariatric surgery, very little data are available on IM and its metabolic effect and contribution to NAFLD. These studies will add more information regarding the role of IM and its effect on potential mechanisms contributing to NAFLD. It will also provide us with pilot data for future intervention studies assessing the potential use of pre- or probiotics for NAFLD in morbidly obese subjects in the setting of bariatric surgery.
Study design
- Observational model
- Cohort
- Time perspective
- Prospective
- Number of arms
- 1
| Arm | Type | Receives |
|---|---|---|
| Bariatric surgery of morbid obese | – | –Morbid obese patient who undergo Bariatric surgery with NAFLD (NASH or SS) status |
Who may qualify
- Ages
- 18 years and older
- Sex
- All
- Healthy volunteers
- Not accepted
- Age groups
- Adult, Older adult
- Study population
- NAFLD is the hepatic manifestation of the metabolic syndrome, and the prevalence is 74-98% in morbidly obese individuals. The aim of this study is to examine the role of intestinal microbiota (IM) in non-alcoholic fatty liver disease (NAFLD) in morbidly obese patients undergoing Roux-en-Y gastric bypass surgery. Alterations of the human gut flora (intestinal microbiota) will be determined before and after surgery in realtion with the change of liver histology.
Key inclusion criteria (3 listed)
- BMI>40 kg/m2 or BMI>35-40 kg/m2 with severe weight loss comorbidities
- Male or female, equal or over 18 years of age
- Alcohol consumption is leass than 20 g/d
Key exclusion criteria (9 listed)
- No diagnosis of NAFLD
- Having liver disease of other etiology
- Having advance liver disease
- Having abnormal coagulation or other reason contraindicating a Liver Biopsy
- On medication known to precipitate steatohepatitis 6 months prior to entry
Eligibility is decided by the study team after screening; this overview does not establish that a patient qualifies. Full inclusion and exclusion criteria.
Primary outcome
Firmicutes/Bacteroides ratio in feces
Time frame: Baseline, 6, 12 months
16S rRNA sequencing will be performed on the Ion Torrent platform
4 secondary outcomes
Overall microbiota composition, amount of selected groups of microorganisms and concentration of Short Chain Fatty Acid (SCFA) in stool sample
Time frame: 8 months
The amount of endotoxin, TNF-alfa and IL-6 in plasma/serum
Time frame: 8 months
The change in inflammation, fibrosis, steatosis in liver histology
Time frame: 12 months
NAFLD activity score
Time frame: baseline, 12 months
Results and safety
Results are not available in the source record.
Research links
- Official record on ClinicalTrials.govLast updated by the sponsor 2 Nov 2022.
- Background: PubMed 23401313Mouzaki M, Comelli EM, Arendt BM, Bonengel J, Fung SK, Fischer SE, McGilvray ID, Allard JP. Intestinal microbiota in patients with nonalcoholic fatty liver disease. Hepatology. 2013 Jul;58(1):120-7. doi: 10.1002/hep.26319. Epub 2013 May 14.
- Background: PubMed 18824034Musso G, Gambino R, Cassader M. Recent insights into hepatic lipid metabolism in non-alcoholic fatty liver disease (NAFLD). Prog Lipid Res. 2009 Jan;48(1):1-26. doi: 10.1016/j.plipres.2008.08.001. Epub 2008 Sep 9.
- Background: PubMed 20460905Bellentani S, Scaglioni F, Marino M, Bedogni G. Epidemiology of non-alcoholic fatty liver disease. Dig Dis. 2010;28(1):155-61. doi: 10.1159/000282080. Epub 2010 May 7.
- Background: PubMed 19409898Mathurin P, Hollebecque A, Arnalsteen L, Buob D, Leteurtre E, Caiazzo R, Pigeyre M, Verkindt H, Dharancy S, Louvet A, Romon M, Pattou F. Prospective study of the long-term effects of bariatric surgery on liver injury in patients without advanced disease. Gastroenterology. 2009 Aug;137(2):532-40. doi: 10.1053/j.gastro.2009.04.052. Epub 2009 May 4.
- Background: PubMed 9122234Yang SQ, Lin HZ, Lane MD, Clemens M, Diehl AM. Obesity increases sensitivity to endotoxin liver injury: implications for the pathogenesis of steatohepatitis. Proc Natl Acad Sci U S A. 1997 Mar 18;94(6):2557-62. doi: 10.1073/pnas.94.6.2557.
- Background: PubMed 22353926da Silva VR, Moreira EA, Wilhelm-Filho D, de Miranda JX, Beninca JP, Vigil SV, Moratelli AM, Garlet TR, de Souza Meirelles MS, Vannucchi H, Frode TS. Proinflammatory and oxidative stress markers in patients submitted to Roux-en-Y gastric bypass after 1 year of follow-up. Eur J Clin Nutr. 2012 Aug;66(8):891-9. doi: 10.1038/ejcn.2012.17. Epub 2012 Feb 22.
- Background: PubMed 20059344Musso G, Gambino R, Cassader M. Emerging molecular targets for the treatment of nonalcoholic fatty liver disease. Annu Rev Med. 2010;61:375-92. doi: 10.1146/annurev.med.60.101107.134820.
- Background: PubMed 21807932Frazier TH, DiBaise JK, McClain CJ. Gut microbiota, intestinal permeability, obesity-induced inflammation, and liver injury. JPEN J Parenter Enteral Nutr. 2011 Sep;35(5 Suppl):14S-20S. doi: 10.1177/0148607111413772. Epub 2011 Aug 1.
- Background: PubMed 21129376Spencer MD, Hamp TJ, Reid RW, Fischer LM, Zeisel SH, Fodor AA. Association between composition of the human gastrointestinal microbiome and development of fatty liver with choline deficiency. Gastroenterology. 2011 Mar;140(3):976-86. doi: 10.1053/j.gastro.2010.11.049. Epub 2010 Dec 1.
- Background: PubMed 17183309Ley RE, Turnbaugh PJ, Klein S, Gordon JI. Microbial ecology: human gut microbes associated with obesity. Nature. 2006 Dec 21;444(7122):1022-3. doi: 10.1038/4441022a.
- Background: PubMed 17183312Turnbaugh PJ, Ley RE, Mahowald MA, Magrini V, Mardis ER, Gordon JI. An obesity-associated gut microbiome with increased capacity for energy harvest. Nature. 2006 Dec 21;444(7122):1027-31. doi: 10.1038/nature05414.
- Background: PubMed 17189447Duncan SH, Belenguer A, Holtrop G, Johnstone AM, Flint HJ, Lobley GE. Reduced dietary intake of carbohydrates by obese subjects results in decreased concentrations of butyrate and butyrate-producing bacteria in feces. Appl Environ Microbiol. 2007 Feb;73(4):1073-8. doi: 10.1128/AEM.02340-06. Epub 2006 Dec 22.
Related trials for Morbid Obesity
RecruitingPhase 3
Fiber and Metformin Combination Therapy in Adolescents With Severe Obesity and Insulin Resistance
Obesity, Childhood, Insulin Resistance
RecruitingPhase 4
Optimizing Portal Hypertension With TIPS and Interval Metabolic Surgery for Advanced Liver Disease
Liver Cirrhoses, Portal Hypertension Related to Cirrhosis
RecruitingPhase 3
A Study Evaluating Mibavademab Treatment of Obesity Due to Leptin (LEP) Gene Mutations in Children, Adolescents and Adults
Monogenic Obesity
RecruitingPhase 4
Impact GLP-1 Agonists Following Bariatric
Morbid Obesity, Metabolic Syndrome
Enrolling by invitation
Biometabolic Outcomes After Weight Loss Surgery: An Individualized Approach
Obesity, Morbid, Metabolic Syndrome
Referral and contact
AzTrials does not enrol participants or take referrals. Contact the study team or a site listed below; they decide who can take part. This study is not recruiting at the moment.
Johane Allard, MD. FRCPC principal investigator
University Health Network, Toronto
1 site in 1 country: see every site and its status.
Questions about this trial
What is this clinical trial studying?
An observational study of Morbid Obesity and Non-alcoholic Fatty Liver Disease, run by Johane Allard at 1 site in Canada.
The full registered description is in the About this study section and the official record.
Who may be eligible to take part?
The sponsor lists 3 inclusion and 9 exclusion criteria. Eligibility is decided by the study team after screening, so read the full criteria and contact a listed site.
Is this clinical trial currently recruiting?
The record says: status not confirmed, as of the sponsor's last update on 2 Nov 2022. Status can change between updates, so confirm with the study contact before making plans.
Where is the study taking place?
The record lists 1 site in Canada. Whether a site is taking part right now should be confirmed with that site. See every site.
What are the possible benefits and risks?
They depend on the study and the treatment, and no study can promise a benefit. The study team explains the known risks during informed consent, before anyone joins; the record itself does not list them.
Are results available for this study?
Results are not available in the source record.
How can a doctor refer a patient or contact the research team?
The record lists no contact. The official record names the sponsor, who can be asked directly. AzTrials does not enrol participants or take referrals.
What does the primary outcome measure?
Firmicutes/Bacteroides ratio in feces (time frame: Baseline, 6, 12 months). It is what the study was designed to measure, not a finding.
Where can I read the original study information?
On the ClinicalTrials.gov record for NCT01856465, which also lists 12 linked publications.
Does a listing mean the treatment is approved or proven to work?
No. A listing means the study is registered. It does not show that the treatment is safe, works, or is approved by a regulator.
How often is this information updated?
AzTrials copies changed records from ClinicalTrials.gov every night and reloads the whole registry every week. The sponsor last updated this record on 2 Nov 2022.