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ObesityNCT05459675

Effects of Very Low-calorie Diet Versus Bariatric Surgery on Body Composition and Gut Microbiota Pattern

A study testing Very low-calorie diet and Bariatric surgery in people with Obesity, run by Mahidol University at 1 site in Thailand.

Unknown status

Status not confirmed. The sponsor has not verified this record for over two years, so it may be out of date.

Official record
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Trial summary

Obesity is a chronic disease characterized by the excessive accumulation of fat in body and it continues to be a major public health problem worldwide. Treatment options for obesity include lifestyle modification, pharmacotherapy and bariatric surgery. Read more about this study

Who is it for?
Ages 15 to 65 yearsHealthy volunteers can take part
Conditions the study is for
Obesity
What is being tested?
Very low-calorie diet and Bariatric surgery
Type of treatment
Surgery or procedure
Could I receive a placebo?
No, everyone receives an active treatment
How many people
54 participants
Where
1 siteThailand
Study dates
20 Jul 2022to 20 Jul 2023
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 15 to 65 years
  • All sexes
  • Healthy volunteers accepted
  • Child, Adult, Older adult

Who may be able to join

  • Aged 15-65 years
  • Male or female
  • Body mass index ≥ 32.5 kg/m2 with obesity related co-morbidity
  • Body mass index ≥ 37.5 kg/m2 with or without an obesity related co-morbidity

Who cannot join

  • End stage disease such as cancer, cirrhosis Child-Pugh C, critical/acute illness
  • Type 1 diabetes mellitus
  • Recent eGFR < 30 ml/min/1.73 m2
  • Weight loss ≥ 5% in the previous 3 months
  • Use of antibiotics in the previous 1 month
  • Use of probiotic or prebiotic supplement in form of tablet or sachet in the previous 14 days
Show all 12Show fewer
  • Current treatment with anti-obesity drugs
  • Pregnancy or breast feeding
  • Substance abuse
  • Uncontrolled psychiatric disorder and eating order
  • History of allergy to any components in meal replacement product or whey protein product
  • Unable to give informed consent

Trial locations and contacts

1 site in 1 country.

Thailand1 site
  • Faculty of Medicine Ramathibodi Hospital Mahidol University

    Bangkok, 10400

Other trials in Thailand

About this study

Official title: Effects of Very Low-calorie Diet Versus Bariatric Surgery on Body Composition and Gut Microbiota Pattern in Obese Patients

Obesity is a chronic disease characterized by the excessive accumulation of fat in body and it continues to be a major public health problem worldwide. Treatment options for obesity include lifestyle modification, pharmacotherapy and bariatric surgery. Bariatric surgery is a highly effective treatment for obesity and results in rapid and sustained weight loss. Also, it significantly alters gut microbiota composition and function. A very low-calorie diet (VLCD) is a rapid weight loss program which calorie intake is severely restricted (< 800 kcal/day). It has been shown to be very effective to induce rapid weight loss and result in comorbidities resolution similar to bariatric surgery. Therefore, this study was aimed to study the effects of 12-week VLCD compare to bariatric surgery (Laparoscopic Roux-en-Y gastric bypass (LRYGB) or Laparoscopic Sleeve Gastrectomy (LSG)) on weight loss, body composition, gut microbiota pattern and other metabolic parameters.

Read the detailed description

The study will include obese patients (body mass index; BMI ≥ 37.5 kg/m2 or BMI ≥ 32.5 kg/m2 with comorbidities), aged 15-65 years at Ramathibodi Hospital, Thailand. The VLCD group will received total diet replacement for 12 weeks and the bariatric surgery group will undergo LRYGB or LSG. Study participants in both groups will be matched according to their age, sex, body mass index (BMI) and diabetic status. Body weight reduction and body composition, gut microbiota pattern, liver stiffness and steatosis, glycemic and other metabolic parameters (glucose, insulin, c-peptide, lipid profile, liver function test, kidney function test, complete blood count, electrolyte blood test, thyroid function tests, serum ketone and adiponectin), health-related quality of life, depression score and twenty-four-hour diet recall and physical activity will be assessed at baseline and at month 1, 3, 6, 9 and 12.

Conditions
Obesity
Being tested
Very low-calorie diet, Bariatric surgery
Keywords
Very low-calorie diet, Bariatric surgery, Body composition, Gut microbiota pattern
Medical subject headings
Obesity

What participants receive

What participants receive. In a randomised study each person is assigned to one group by chance.

  • Very low-calorie dietOther

    Meal replacement (800 kcal/day, protein 90 g/day)

  • Bariatric surgeryProcedure or surgery

    Bariatric surgery will be performed by single surgeon at Ramathibodi Hospital Mahidol University, Thailand. Postoperative diet progression according to the current guideline will be prescribed from early post-op period to 1 year after surgery

Study groups in NCT05459675
Study groupRoleWhat they receive
Very low-calorie dietExperimentalPatients in the very low-calorie diet group will be prescribed a very low-calorie diet (meal replacement) for 12 weeks, then the patients will be monitored up to 1 year
Receives: Other: Very low-calorie diet
Bariatric surgeryExperimentalPatients in the bariatric surgery group will be undergone bariatric surgery LRYGB and will be follow-up according the current guideline
Receives: Procedure: Bariatric surgery

What is being measured

The primary outcome is the main question the study is designed to answer.

  1. Changes in body weight

    Weight in kg

    Measured: From baseline to 12 weeks

Secondary outcomes (15)
  1. Body Composition

    The percentage of body fat and skeleton muscle mass

    Measured: From baseline to 12 weeks

  2. Gut microbiota pattern

    Measured by 16S ribosomal RNA (rRNA) gene sequencing on the fecal samples

    Measured: From baseline to 12 weeks

  3. Liver stiffness

    Measured by FibroScan® instrument

    Measured: From baseline to 12 weeks

  4. Liver steatosis

    Measured by FibroScan® instrument

    Measured: From baseline to 12 weeks

  5. Blood pressure

    Systolic and diastolic blood pressure

    Measured: From baseline to 12 weeks

  6. Fasting plasma glucose

    Measured in mg/dl

    Measured: From baseline to 12 weeks

  7. Hemoglobin A1c

    Measured in %

    Measured: From baseline to 12 weeks

  8. Fasting insulin

    Measured in μIU/l

    Measured: From baseline to 12 weeks

  9. Insulin resistance

    Measured by the homeostatic model of insulin resistance (HOMA-IR)

    Measured: From baseline to 12 weeks

  10. Triglyceride

    Measured in mg/dl

    Measured: From baseline to 12 weeks

  11. Total cholesterol

    Measured in mg/dl

    Measured: From baseline to 12 weeks

  12. LDL-cholesterol

    Measured in mg/dl

    Measured: From baseline to 12 weeks

  13. HDL-cholesterol

    Measured in mg/dl

    Measured: From baseline to 12 weeks

  14. Health-related quality of life

    Measured by the EQ-5D-5L questionnaire

    Measured: From baseline to 12 weeks

  15. Depression

    Measured by the PHQ-9 questionnaire

    Measured: From baseline to 12 weeks

Timeline

From the start of the study to its completion; the mark is today. Estimated dates are the sponsor’s plan.

  1. First posted15 Jul 2022
  2. Study start20 Jul 2022
  3. Primary completion20 Nov 2022
  4. Study completion20 Jul 2023 (estimated)

Resources

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
Non-randomised
Intervention model
Parallel groups
Model description
Three groups of patients will be recruited at obesity clinic, Ramathibodi Hospital Mahidol University, Bangkok, Thailand. One group will take part in the very low-calorie diet (VLCD). One group will be undergone bariatric surgery (LRYGB or LSG)
Masking
None (open label)
Enrolment
54 participants (estimated)
IDs, dates and publications
ClinicalTrials.gov ID
NCT05459675
Sponsor's protocol ID
MURA2016/647
Status last verified
Jul 2023
First submitted
2 Jun 2022
Last updated
5 Jul 2023
Results posted
No
Data monitoring committee
No
FDA-regulated drug
No
FDA-regulated device
No
Individual data sharing
No

Publications

  • Wharton S, Lau DCW, Vallis M, Sharma AM, Biertho L, Campbell-Scherer D, Adamo K, Alberga A, Bell R, Boule N, Boyling E, Brown J, Calam B, Clarke C, Crowshoe L, Divalentino D, Forhan M, Freedhoff Y, Gagner M, Glazer S, Grand C, Green M, Hahn M, Hawa R, Henderson R, Hong D, Hung P, Janssen I, Jacklin K, Johnson-Stoklossa C, Kemp A, Kirk S, Kuk J, Langlois MF, Lear S, McInnes A, Macklin D, Naji L, Manjoo P, Morin MP, Nerenberg K, Patton I, Pedersen S, Pereira L, Piccinini-Vallis H, Poddar M, Poirier P, Prud'homme D, Salas XR, Rueda-Clausen C, Russell-Mayhew S, Shiau J, Sherifali D, Sievenpiper J, Sockalingam S, Taylor V, Toth E, Twells L, Tytus R, Walji S, Walker L, Wicklum S. Obesity in adults: a clinical practice guideline. CMAJ. 2020 Aug 4;192(31):E875-E891. doi: 10.1503/cmaj.191707. No abstract available.

    PubMed 32753461
  • Bluher M. Obesity: global epidemiology and pathogenesis. Nat Rev Endocrinol. 2019 May;15(5):288-298. doi: 10.1038/s41574-019-0176-8.

    PubMed 30814686
  • Scheithauer TPM, Rampanelli E, Nieuwdorp M, Vallance BA, Verchere CB, van Raalte DH, Herrema H. Gut Microbiota as a Trigger for Metabolic Inflammation in Obesity and Type 2 Diabetes. Front Immunol. 2020 Oct 16;11:571731. doi: 10.3389/fimmu.2020.571731. eCollection 2020.

    PubMed 33178196
  • Shao Y, Ding R, Xu B, Hua R, Shen Q, He K, Yao Q. Alterations of Gut Microbiota After Roux-en-Y Gastric Bypass and Sleeve Gastrectomy in Sprague-Dawley Rats. Obes Surg. 2017 Feb;27(2):295-302. doi: 10.1007/s11695-016-2297-7.

    PubMed 27440168
  • Lean ME, Leslie WS, Barnes AC, Brosnahan N, Thom G, McCombie L, Peters C, Zhyzhneuskaya S, Al-Mrabeh A, Hollingsworth KG, Rodrigues AM, Rehackova L, Adamson AJ, Sniehotta FF, Mathers JC, Ross HM, McIlvenna Y, Stefanetti R, Trenell M, Welsh P, Kean S, Ford I, McConnachie A, Sattar N, Taylor R. Primary care-led weight management for remission of type 2 diabetes (DiRECT): an open-label, cluster-randomised trial. Lancet. 2018 Feb 10;391(10120):541-551. doi: 10.1016/S0140-6736(17)33102-1. Epub 2017 Dec 5.

    PubMed 29221645
  • Umphonsathien M, Prutanopajai P, Aiam-O-Ran J, Thararoop T, Karin A, Kanjanapha C, Jiamjarasrangsi W, Khovidhunkit W. Immediate and long-term effects of a very-low-calorie diet on diabetes remission and glycemic control in obese Thai patients with type 2 diabetes mellitus. Food Sci Nutr. 2019 Feb 11;7(3):1113-1122. doi: 10.1002/fsn3.956. eCollection 2019 Mar.

    PubMed 30918654
  • Lane M, Howland G, West M, Hockey M, Marx W, Loughman A, O'Hely M, Jacka F, Rocks T. The effect of ultra-processed very low-energy diets on gut microbiota and metabolic outcomes in individuals with obesity: A systematic literature review. Obes Res Clin Pract. 2020 May-Jun;14(3):197-204. doi: 10.1016/j.orcp.2020.04.006. Epub 2020 Jun 13.

    PubMed 32546361
  • Guo Y, Huang ZP, Liu CQ, Qi L, Sheng Y, Zou DJ. Modulation of the gut microbiome: a systematic review of the effect of bariatric surgery. Eur J Endocrinol. 2018 Jan;178(1):43-56. doi: 10.1530/EJE-17-0403. Epub 2017 Sep 15.

    PubMed 28916564
  • Damms-Machado A, Mitra S, Schollenberger AE, Kramer KM, Meile T, Konigsrainer A, Huson DH, Bischoff SC. Effects of surgical and dietary weight loss therapy for obesity on gut microbiota composition and nutrient absorption. Biomed Res Int. 2015;2015:806248. doi: 10.1155/2015/806248. Epub 2015 Feb 1.

    PubMed 25710027
  • Castaner O, Goday A, Park YM, Lee SH, Magkos F, Shiow STE, Schroder H. The Gut Microbiome Profile in Obesity: A Systematic Review. Int J Endocrinol. 2018 Mar 22;2018:4095789. doi: 10.1155/2018/4095789. eCollection 2018.

    PubMed 29849617

Questions about this trial

What is this clinical trial studying?

A study testing Very low-calorie diet and Bariatric surgery in people with Obesity, run by Mahidol University at 1 site in Thailand.

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 4 inclusion and 12 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 5 Jul 2023. 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 Thailand. 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?

Changes in body weight (time frame: From baseline to 12 weeks). 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 NCT05459675, which also lists 10 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 5 Jul 2023.

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