ObesityB-SMARTNCT00956566
Comparison of Low Fat and Low Carbohydrate Diets With Respect to Weight Loss and Metabolic Effects
A study testing dietary intervention in people with Obesity, run by Hannover Medical School at 1 site in Germany.
Trial summary
The investigators will test the hypothesis that a LOW CARB hypocaloric diet will reduce body weight over six months more than a LOW FAT hypocaloric diet. In addition to body weight, the investigators will measure cardiovascular and metabolic variables and will take blood samples in order to determine whether certain… Read more about this study
- Who is it for?
- Ages 18 to 60 years
- Conditions the study is for
- Obesity
- What is being tested?
- dietary intervention
- Type of treatment
- Lifestyle or therapy programme
- Could I receive a placebo?
- No, everyone receives an active treatment
- How many people
- 170 participants
- Where
- 1 siteGermany
- Study dates
- Apr 2007to Jul 2012
- Phase
- Interventional
- 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 to 60 years
- All sexes
- No healthy volunteers
- Adult
Who may be able to join
- Body Mass Index > 27 kg/m2
- No chronic medication (except oral contraceptives and L-Thyroxine) or possibility to stop medication for study duration
- Able to give written informed consent
Who cannot join
- Pregnancy and nursing
- Severe cardiovascular, liver, kidney, hepatic or orthopedic disease that need treatment
- Metabolic or endocrine disease that need treatment
- Hypertension blood pressure > 160/95 mmHg or need of > 2 drugs
- Previous stroke or cerebral ischemia
- Significant neurologic or psychiatric disease
Show all 13Show fewer
- Any kind of eating disorder
- Bariatric surgery in the past
- Drug or alcohol abuse
- Any cancer in the past
- Acute and chronic infections
- Metallic implants (e.g. pace makers) or conditions that do not allow MRI scans
- Body weight > 130 kg
Trial locations and contacts
1 site in 1 country.
About this study
Official title: Randomized Parallel Group Comparison on the Influence of a Low Carbohydrate and a Low Fat Hypocaloric 6 Months Diet on Body Weight Reduction, Metabolic and Cardiovascular Variables in Obese Healthy Women and Men.
The investigators will test the hypothesis that a LOW CARB hypocaloric diet will reduce body weight over six months more than a LOW FAT hypocaloric diet. In addition to body weight, the investigators will measure cardiovascular and metabolic variables and will take blood samples in order to determine whether certain metabolites may predict the diet success.
- Conditions
- Obesity
- Being tested
- dietary intervention
- Medical subject headings
- Obesity
What participants receive
What participants receive. In a randomised study each person is assigned to one group by chance.
dietary interventionBehavioural
dietary counseling, group teaching
| Study group | Role | What they receive |
|---|---|---|
| low fat hypocaloric diet | Active comparator | Not described Receives: Behavioral: dietary intervention |
| Low carbohydrate hypocaloric diet | Active comparator | Not described Receives: Behavioral: dietary intervention |
What is being measured
The primary outcome is the main question the study is designed to answer.
Body weight reduction
Measured: Month 6
Secondary outcomes (4)
Weight maintenance
follow up assesement after 6 months diet
Measured: Month 12 - 36
Reduction of visceral adipose tissue mass
Measured: Month 6
Reduction of left ventricular mass
Measured: Month 6
Influence on energy expenditure and fat oxidation rates
Measured: Month 6
Timeline
From the start of the study to its completion; the mark is today. Estimated dates are the sponsor’s plan.
- First posted11 Aug 2009 (estimated)
- Study startApr 2007
- Primary completionDec 2011
- Study completionJul 2012
Resources
- Official record on ClinicalTrials.govThe registry entry this page is built from, with its full change history.
- Publications (7)Papers the sponsor has linked to this study.
- Other trials for 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
- Interventional
- Phase
- Phase N/A
- Primary purpose
- Treatment
- Allocation
- Randomised
- Intervention model
- Parallel groups
- Masking
- None (open label)
- Enrolment
- 170 participants (actual)
Sponsor and investigators
- Lead sponsor
- Hannover Medical School
- Sponsor type
- University, hospital or other
- Responsible party
- Principal investigator, Prof. Dr. Jens Jordan, Hannover Medical School
- Investigators
- Jens Jordan, MD, Principal investigator, Hannover Medical School
IDs, dates and publications
- ClinicalTrials.gov ID
- NCT00956566
- Sponsor's protocol ID
- B-SMART
- Acronym
- B-SMART
- Status last verified
- Jul 2012
- First submitted
- 10 Aug 2009
- Last updated
- 30 Jul 2012
- Results posted
- No
- Data monitoring committee
- No
Publications
Haufe S, Engeli S, Kaminski J, Witt H, Rein D, Kamlage B, Utz W, Fuhrmann JC, Haas V, Mahler A, Schulz-Menger J, Luft FC, Boschmann M, Jordan J. Branched-chain amino acid catabolism rather than amino acids plasma concentrations is associated with diet-induced changes in insulin resistance in overweight to obese individuals. Nutr Metab Cardiovasc Dis. 2017 Oct;27(10):858-864. doi: 10.1016/j.numecd.2017.07.001. Epub 2017 Jul 11.
PubMed 28958691Haufe S, Haas V, Utz W, Birkenfeld AL, Jeran S, Bohnke J, Mahler A, Luft FC, Schulz-Menger J, Boschmann M, Jordan J, Engeli S. Long-lasting improvements in liver fat and metabolism despite body weight regain after dietary weight loss. Diabetes Care. 2013 Nov;36(11):3786-92. doi: 10.2337/dc13-0102. Epub 2013 Aug 20.
PubMed 23963894Engeli S, Utz W, Haufe S, Lamounier-Zepter V, Pofahl M, Traber J, Janke J, Luft FC, Boschmann M, Schulz-Menger J, Jordan J. Fatty acid binding protein 4 predicts left ventricular mass and longitudinal function in overweight and obese women. Heart. 2013 Jul;99(13):944-8. doi: 10.1136/heartjnl-2013-303735. Epub 2013 Apr 18.
PubMed 23598540Utz W, Engeli S, Haufe S, Kast P, Bohnke J, Haas V, Hermsdorf M, Wiesner S, Pofahl M, Traber J, Luft FC, Boschmann M, Jordan J, Schulz-Menger J. Moderate dietary weight loss reduces myocardial steatosis in obese and overweight women. Int J Cardiol. 2013 Aug 10;167(3):905-9. doi: 10.1016/j.ijcard.2012.03.104. Epub 2012 Apr 10.
PubMed 22494864Haufe S, Utz W, Engeli S, Kast P, Bohnke J, Pofahl M, Traber J, Haas V, Hermsdorf M, Mahler A, Busjahn A, Wiesner S, Otto C, Mehling H, Luft FC, Boschmann M, Schulz-Menger J, Jordan J. Left ventricular mass and function with reduced-fat or reduced-carbohydrate hypocaloric diets in overweight and obese subjects. Hypertension. 2012 Jan;59(1):70-5. doi: 10.1161/HYPERTENSIONAHA.111.178616. Epub 2011 Nov 7.
PubMed 22068866Utz W, Engeli S, Haufe S, Kast P, Hermsdorf M, Wiesner S, Pofahl M, Traber J, Luft FC, Boschmann M, Schulz-Menger J, Jordan J. Myocardial steatosis, cardiac remodelling and fitness in insulin-sensitive and insulin-resistant obese women. Heart. 2011 Oct;97(19):1585-9. doi: 10.1136/hrt.2011.224451. Epub 2011 Jul 20.
PubMed 21775510Haufe S, Engeli S, Kast P, Bohnke J, Utz W, Haas V, Hermsdorf M, Mahler A, Wiesner S, Birkenfeld AL, Sell H, Otto C, Mehling H, Luft FC, Eckel J, Schulz-Menger J, Boschmann M, Jordan J. Randomized comparison of reduced fat and reduced carbohydrate hypocaloric diets on intrahepatic fat in overweight and obese human subjects. Hepatology. 2011 May;53(5):1504-14. doi: 10.1002/hep.24242. Epub 2011 Mar 11.
PubMed 21400557
Study at a glance
From the registry record, last updated by the sponsor on 30 Jul 2012. Recruitment status is as the sponsor reported it: confirm with the study team.
- Official title
- Randomized Parallel Group Comparison on the Influence of a Low Carbohydrate and a Low Fat Hypocaloric 6 Months Diet on Body Weight Reduction, Metabolic and Cardiovascular Variables in Obese Healthy Women and Men.
- ClinicalTrials.gov ID
- NCT00956566
- Acronym / sponsor ID
- B-SMART / B-SMART
- Conditions
- Obesity
- Study type
- Interventional
- Recruitment status
- Completed
- Enrolment
- 170 participants (actual)
- Lead sponsor
- Hannover Medical SchoolUniversity, hospital or other
- Study start
- Apr 2007
- Primary completion
- Dec 2011 (actual)
- Study completion
- Jul 2012 (actual)
- First posted
- 11 Aug 2009 (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.
The investigators will test the hypothesis that a LOW CARB hypocaloric diet will reduce body weight over six months more than a LOW FAT hypocaloric diet. In addition to body weight, the investigators will measure cardiovascular and metabolic variables and will take blood samples in order to determine whether certain metabolites may predict the diet success.
Study design
- Primary purpose
- Treatment
- Allocation
- Randomised
- Intervention model
- Parallel groups
- Masking
- None (open label)
- Number of arms
- 2
| Arm | Type | Receives |
|---|---|---|
| low fat hypocaloric diet | Active comparator | Behavioral: dietary intervention |
| Low carbohydrate hypocaloric diet | Active comparator | Behavioral: dietary intervention |
Who may qualify
- Ages
- 18 to 60 years
- Sex
- All
- Healthy volunteers
- Not accepted
- Age groups
- Adult
Key inclusion criteria (3 listed)
- Body Mass Index > 27 kg/m2
- No chronic medication (except oral contraceptives and L-Thyroxine) or possibility to stop medication for study duration
- Able to give written informed consent
Key exclusion criteria (13 listed)
- Pregnancy and nursing
- Severe cardiovascular, liver, kidney, hepatic or orthopedic disease that need treatment
- Metabolic or endocrine disease that need treatment
- Hypertension blood pressure > 160/95 mmHg or need of > 2 drugs
- Previous stroke or cerebral ischemia
Eligibility is decided by the study team after screening; this overview does not establish that a patient qualifies. Full inclusion and exclusion criteria.
Interventions
| Intervention | Type | Arms |
|---|---|---|
| dietary interventiondietary counseling, group teaching | Behavioural | Low carbohydrate hypocaloric diet, low fat hypocaloric diet |
Primary outcome
Body weight reduction
Time frame: Month 6
4 secondary outcomes
Weight maintenance
Time frame: Month 12 - 36
Reduction of visceral adipose tissue mass
Time frame: Month 6
Reduction of left ventricular mass
Time frame: Month 6
Influence on energy expenditure and fat oxidation rates
Time frame: Month 6
Results and safety
The study is completed, but results are not available in the source record. That does not mean the treatment did or did not work.
Research links
- Official record on ClinicalTrials.govLast updated by the sponsor 30 Jul 2012.
- Derived from this study: PubMed 28958691Haufe S, Engeli S, Kaminski J, Witt H, Rein D, Kamlage B, Utz W, Fuhrmann JC, Haas V, Mahler A, Schulz-Menger J, Luft FC, Boschmann M, Jordan J. Branched-chain amino acid catabolism rather than amino acids plasma concentrations is associated with diet-induced changes in insulin resistance in overweight to obese individuals. Nutr Metab Cardiovasc Dis. 2017 Oct;27(10):858-864. doi: 10.1016/j.numecd.2017.07.001. Epub 2017 Jul 11.
- Derived from this study: PubMed 23963894Haufe S, Haas V, Utz W, Birkenfeld AL, Jeran S, Bohnke J, Mahler A, Luft FC, Schulz-Menger J, Boschmann M, Jordan J, Engeli S. Long-lasting improvements in liver fat and metabolism despite body weight regain after dietary weight loss. Diabetes Care. 2013 Nov;36(11):3786-92. doi: 10.2337/dc13-0102. Epub 2013 Aug 20.
- Derived from this study: PubMed 23598540Engeli S, Utz W, Haufe S, Lamounier-Zepter V, Pofahl M, Traber J, Janke J, Luft FC, Boschmann M, Schulz-Menger J, Jordan J. Fatty acid binding protein 4 predicts left ventricular mass and longitudinal function in overweight and obese women. Heart. 2013 Jul;99(13):944-8. doi: 10.1136/heartjnl-2013-303735. Epub 2013 Apr 18.
- Derived from this study: PubMed 22494864Utz W, Engeli S, Haufe S, Kast P, Bohnke J, Haas V, Hermsdorf M, Wiesner S, Pofahl M, Traber J, Luft FC, Boschmann M, Jordan J, Schulz-Menger J. Moderate dietary weight loss reduces myocardial steatosis in obese and overweight women. Int J Cardiol. 2013 Aug 10;167(3):905-9. doi: 10.1016/j.ijcard.2012.03.104. Epub 2012 Apr 10.
- Derived from this study: PubMed 22068866Haufe S, Utz W, Engeli S, Kast P, Bohnke J, Pofahl M, Traber J, Haas V, Hermsdorf M, Mahler A, Busjahn A, Wiesner S, Otto C, Mehling H, Luft FC, Boschmann M, Schulz-Menger J, Jordan J. Left ventricular mass and function with reduced-fat or reduced-carbohydrate hypocaloric diets in overweight and obese subjects. Hypertension. 2012 Jan;59(1):70-5. doi: 10.1161/HYPERTENSIONAHA.111.178616. Epub 2011 Nov 7.
- Derived from this study: PubMed 21775510Utz W, Engeli S, Haufe S, Kast P, Hermsdorf M, Wiesner S, Pofahl M, Traber J, Luft FC, Boschmann M, Schulz-Menger J, Jordan J. Myocardial steatosis, cardiac remodelling and fitness in insulin-sensitive and insulin-resistant obese women. Heart. 2011 Oct;97(19):1585-9. doi: 10.1136/hrt.2011.224451. Epub 2011 Jul 20.
- Derived from this study: PubMed 21400557Haufe S, Engeli S, Kast P, Bohnke J, Utz W, Haas V, Hermsdorf M, Mahler A, Wiesner S, Birkenfeld AL, Sell H, Otto C, Mehling H, Luft FC, Eckel J, Schulz-Menger J, Boschmann M, Jordan J. Randomized comparison of reduced fat and reduced carbohydrate hypocaloric diets on intrahepatic fat in overweight and obese human subjects. Hepatology. 2011 May;53(5):1504-14. doi: 10.1002/hep.24242. Epub 2011 Mar 11.
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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.
Jens Jordan, MD principal investigator
Hannover Medical School
1 site in 1 country: see every site and its status.
Questions about this trial
What is this clinical trial studying?
A study testing dietary intervention in people with Obesity, run by Hannover Medical School at 1 site in Germany.
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 13 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: finished, as of the sponsor's last update on 30 Jul 2012. 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 Germany. 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?
The study is completed, but results are not available in the source record. That does not mean the treatment did or did not work.
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?
Body weight reduction (time frame: Month 6). 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 NCT00956566, which also lists 7 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 30 Jul 2012.