The Metabolic Contribution of the Human Microbiota to Resting Energy Expenditure (A-P-REE)

June 18, 2007 updated by: Tel-Aviv Sourasky Medical Center
The purpose of our study is to evaluate the metabolic contribution of the human microbiota to resting energy expenditure

Study Overview

Status

Unknown

Conditions

Intervention / Treatment

Detailed Description

There are now >500 million adult humans in the world who are overweight [body mass index (BMI) of 25.0-29.9 kg/m2] and 250 million who are obese (BMI 30 kg/m2). This growing epidemic threatens both industrialized and developing countries and has been accompanied by worldwide increases in obesity-related disorders, including type II diabetes, hypertension, cardiovascular pathology, and nonalcoholic fatty liver disease. In the United States, 64% of adults are overweight or obese, prompting the Surgeon General to designate this condition as the most important public health challenge of our time.

The worldwide obesity epidemic is stimulating efforts to identify host and environmental factors that affect energy balance. The Human gut contains an immense number of microorganisms, collectively known as the microbiota. This community consists of at least 1013 citizens, is dominated by anaerobic bacteria, and includes 500-1,000 species whose collective genomes are estimated to contain 100 times more genes than our own human genome. The microbiota can be viewed as a metabolic "organ" exquisitely tuned to our physiology that performs functions that we have not had to evolve on our own. These functions include the ability to process otherwise indigestible components of our diet, such as plant polysaccharides, and therefore may have an impact on our energy balance.

Comparisons of the distal gut microbiota of genetically obese mice and their lean littermates, as well as those of obese and lean human volunteers have revealed that obesity is associated with changes in the relative abundance of two dominant bacterial divisions, the Bacteroidetes and the Firmicutes. Turnbaugh et al demonstrated through metagenomic and biochemical analyses that these changes affect the metabolic potential of the mouse gut microbiota. Furthermore, this trait is transmissible: colonization of germ-free mice with an 'obese microbiota' results in a significantly greater increase in total body fat than colonization with a 'lean microbiota'. These results identify the gut microbiota as an additional contributing factor to the pathophysiology of obesity. It has been suggested, therefore, that the obese microbiome has an increased capacity to harvest energy from the diet.

Study Type

Observational

Enrollment (Anticipated)

40

Contacts and Locations

This section provides the contact details for those conducting the study, and information on where this study is being conducted.

Study Locations

Participation Criteria

Researchers look for people who fit a certain description, called eligibility criteria. Some examples of these criteria are a person's general health condition or prior treatments.

Eligibility Criteria

Ages Eligible for Study

20 years to 60 years (Adult)

Accepts Healthy Volunteers

No

Genders Eligible for Study

All

Description

Inclusion criteria

  • 40 patients that refers to helicobacter pylori treatment
  • Aged 20-60 years old
  • 22 Kg/m2 ≤ BMI ≤ 30 Kg/m2
  • Functional GI trace with permanent stool number
  • Keeping on a permanent diet
  • Written informed consent
  • Stated availability throughout the study period
  • Mental ability to understand and follow the protocol

Exclusion criteria

  • Use of laxatives
  • Confirmed GI tract infections or inflammatory bowel disease
  • Any major chronic illness
  • Pregnancy
  • Participation in other clinical trials
  • Use of oral or intravenous antibiotics during 8 weeks prior to recruitment

Study Plan

This section provides details of the study plan, including how the study is designed and what the study is measuring.

How is the study designed?

Design Details

Collaborators and Investigators

This is where you will find people and organizations involved with this study.

Sponsor

Tel-Aviv Sourasky Medical Center

Investigators

  • Study Director: Nachum Vaisman, Prof.

Study record dates

These dates track the progress of study record and summary results submissions to ClinicalTrials.gov. Study records and reported results are reviewed by the National Library of Medicine (NLM) to make sure they meet specific quality control standards before being posted on the public website.

Study Major Dates

Study Start

June 1, 2007

Study Completion (Anticipated)

December 1, 2007

Study Registration Dates

First Submitted

June 18, 2007

First Submitted That Met QC Criteria

June 18, 2007

First Posted (Estimate)

June 19, 2007

Study Record Updates

Last Update Posted (Estimate)

June 19, 2007

Last Update Submitted That Met QC Criteria

June 18, 2007

Last Verified

March 1, 2007

More Information

Terms related to this study

Keywords

Additional Relevant MeSH Terms

Other Study ID Numbers

  • TASMC-07-AH-176-CTIL

This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.

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