The Effect of High Protein Diets on Weight Loss and Lean Muscle Mass in Patients Awaiting Bariatric Surgery

October 26, 2017 updated by: Andrew MacCormick, University of Auckland, New Zealand
All patients in CMDHB eligible for bariatric surgery are given a weight loss goal prior to surgery. It is unknown what the most effective diet is to lose weight, while still preserving muscle mass. The diet must also be acceptable and adhered to by patients. The aim of this study is to find out if a diet that is higher in protein and lower in carbohydrate than the standard Ministry of Health guidelines will have a greater effect on weight loss, preservation of lean muscle mass, surgical recovery score, adherence and acceptability.

Study Overview

Status

Completed

Conditions

Intervention / Treatment

Detailed Description

This pilot project is a randomised control trial with 24 participants. Diets will consist of 1200 and 1500kcals for females and males, respectively. The control arm is to receive the Ministry of Health guidelines percentage energy from carbohydrate (50-55%), protein (10-15%) and fat (30%). The intervention arm is to be lower in carbohydrate (40%), higher in protein (30%), moderate fat (30%). Participants will be required to continue the diet for at least 8 weeks while waiting for surgery. At baseline and at eight weeks their weight, hip circumference, waist circumference, neck circumference and body composition measurements will be taken. During their prescribed diet they are required to fill out a 3-day diet record. At the end of eight weeks the participants will perform a twenty-four hour urine collect for urea and creatinine. This will help determine adherence. Post-surgery (21-28 days) they will be required to complete a surgical recovery questionnaire and the above measurements will be recorded again. These data will be collected over a period beginning January 2015. It is expected that the intervention arm will have greater weight loss and better preservation of muscle mass leading to a better surgical recovery score. However because the intervention requires a higher intake of protein this may have an effect on adherence and acceptability in these participants. There are no known adverse effects of the intervention diet in the short term.

Study Type

Interventional

Enrollment (Actual)

20

Phase

  • Not Applicable

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

  • New Zealand
      • Auckland, New Zealand
        • Counties Manukau District Health Board

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

  • Child
  • Adult
  • Older Adult

Accepts Healthy Volunteers

Yes

Genders Eligible for Study

All

Description

Inclusion Criteria:

  • Participants in this study will be patients eligible for bariatric surgery under CMDHB. These participants must have a BMI greater than 35kg/m2 with co-morbidities or a BMI greater than 40kg/m2.

Exclusion Criteria:

  • Patients will be excluded from study if they do not attend surgeon or dietitian appointments. To be included in this study patients must be English speaking and weigh under 200kg.

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

  • Primary Purpose: Treatment
  • Allocation: Randomized
  • Interventional Model: Parallel Assignment
  • Masking: None (Open Label)

Arms and Interventions

Participant Group / Arm
Intervention / Treatment
No Intervention: Control Standard Protein Diet
Control Arm Ministry of Health guidelines percentage energy from carbohydrate (50-55%), protein (10-15%) and fat (30%).
Experimental: Intervention High Protein Diet
Intervention Arm Percentage energy from carbohydrate (40%), protein (30%) and fat (30%).
Other: High protein diet
The intervention diet is higher in protein than the control diet.

What is the study measuring?

Primary Outcome Measures

Outcome Measure
Measure Description
Time Frame
Change in Weight
Time Frame: After 8-weeks of diet and 21-28 days post bariatric surgery
Scales
After 8-weeks of diet and 21-28 days post bariatric surgery
Change in Total body muscle mass
Time Frame: After 8-weeks of diet and 21-28 days post bariatric surgery
Biometric scales
After 8-weeks of diet and 21-28 days post bariatric surgery

Secondary Outcome Measures

Outcome Measure
Measure Description
Time Frame
Surgical recovery score
Time Frame: Surgical recovery score 21-28 days post surgery
SRS tool
Surgical recovery score 21-28 days post surgery
compliance
Time Frame: 8 weeks
urinary creatinine
8 weeks

Collaborators and Investigators

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

Sponsor

University of Auckland, New Zealand

Collaborators

Counties Manukau Health

Investigators

  • Principal Investigator: Andrew D MacCormick, FRACS, University of Auckland, New Zealand

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

May 1, 2015

Primary Completion (Actual)

August 1, 2016

Study Completion (Actual)

August 1, 2016

Study Registration Dates

First Submitted

May 26, 2015

First Submitted That Met QC Criteria

December 11, 2015

First Posted (Estimate)

December 16, 2015

Study Record Updates

Last Update Posted (Actual)

October 27, 2017

Last Update Submitted That Met QC Criteria

October 26, 2017

Last Verified

October 1, 2017

More Information

Terms related to this study

Additional Relevant MeSH Terms

Other Study ID Numbers

  • Highproteinbariatric

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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