Calorie Restriction, Protein Supplementation and Metabolic Health (CRPS)

March 22, 2017 updated by: Washington University School of Medicine

Calorie Restriction and Metabolic Health

The purpose of this study is to determine whether consuming additional protein during calorie restriction induced weight loss has beneficial or harmful effects on multi-organ (liver, muscle, adipose tissue) insulin sensitivity, colonocyte proliferation rates, the gut microbiome, muscle mass and function, and bone mineral density in obese, postmenopausal women.

Study Overview

Status

Completed

Conditions

Intervention / Treatment

Study Type

Interventional

Enrollment (Actual)

75

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

  • United States
    • Missouri
      • Saint Louis, Missouri, United States, 63110
        • Washington University School of Medicine

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

50 years to 65 years (Adult, Older Adult)

Accepts Healthy Volunteers

Yes

Genders Eligible for Study

Female

Description

Inclusion Criteria:

  • Obese with body mass index (BMI) between 30 and 50 kg/m2
  • Postmenopausal
  • Sedentary (i.e., less than 1.5 hours of exercise per week)

Exclusion Criteria:

  • Individuals with diabetes and/or uncontrolled hypertension
  • Individuals with hepatitis B and/or C
  • Individuals who smoke
  • Individuals with an allergy to whey protein

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
Active Comparator: Weight loss with normal protein intake
Behavioral: Weight loss with normal protein intake
Goal of 8 to 10% weight loss while consuming the recommended daily allowance of protein (i.e, 0.8 grams of protein per kg body weight per day).
No Intervention: Weight maintenance
Weight maintenance with normal protein intake
Experimental: Weight loss with protein supplementation
Behavioral: Weight loss with protein supplementation
Goal of 8 to 10% weight loss while consuming 150% of the recommended daily allowance of protein (i.e., 1.2 grams of protein per kg body weight per day).

What is the study measuring?

Primary Outcome Measures

Outcome Measure
Measure Description
Time Frame
Change in muscle volume
Time Frame: Baseline and at 10% weight loss in calorie restriction groups and ~6 to 7 months in the weight maintenance group
Thigh muscle volume will be measured by magnetic resonance imaging (MRI)
Baseline and at 10% weight loss in calorie restriction groups and ~6 to 7 months in the weight maintenance group
Change in muscle strength
Time Frame: Baseline and at 10% weight loss in calorie restriction groups and ~6 to 7 months in the weight maintenance group
Muscle strength will be evaluated by administering maximum one repetition strength and isokinetic strength tests.
Baseline and at 10% weight loss in calorie restriction groups and ~6 to 7 months in the weight maintenance group
Changes in bone mineral density and bone mineral content
Time Frame: Baseline and at 10% weight loss in calorie restriction groups and ~6 to 7 months in the weight maintenance group
Total bone mass and total body and regional bone mineral density will be evaluated by using dual X-ray energy absorptiometry (DXA).
Baseline and at 10% weight loss in calorie restriction groups and ~6 to 7 months in the weight maintenance group

Secondary Outcome Measures

Outcome Measure
Measure Description
Time Frame
Change in bacterial populations found in the stool
Time Frame: Baseline and at 10% weight loss in calorie restriction groups and ~6 to 7 months in the weight maintenance group
Baseline and at 10% weight loss in calorie restriction groups and ~6 to 7 months in the weight maintenance group
Change in insulin sensitivity
Time Frame: Baseline and at 10% weight loss in calorie restriction groups and ~6 to 7 months in the weight maintenance group
Insulin sensitivity (glucose rate of disappearance [Rd] during a hyperinsulinemic-euglycemic clamp procedure) will be evaluated in a subset of 10 participants per group because power analysis has determined that this number is sufficient to detect a 25% difference between groups assuming 80% power, an alpha value of 0.05 and an average baseline insulin-stimulated glucose Rd of 2,590 ± 492 µmol/min, the average ± SD insulin stimulated glucose Rd the investigators have measured during the past 20 y in obese subjects. In the investigators' experience (Kirk et al., 2009 and Magkos et al., 2016), the weight loss induced increase in insulin stimulated glucose Rd is ~50%.
Baseline and at 10% weight loss in calorie restriction groups and ~6 to 7 months in the weight maintenance group
Change in muscle protein metabolism
Time Frame: Baseline and at 5% weight loss in the calorie restriction groups and after ~3 months in the weight maintenance group
Rates of muscle protein synthesis, breakdown and net protein balance will be assessed during postabsorptive conditions and when insulin and/or amino acid concentrations are elevated.
Baseline and at 5% weight loss in the calorie restriction groups and after ~3 months in the weight maintenance group
Change in cell proliferation (growth) rates in the colon
Time Frame: Baseline and at 10% weight loss in calorie restriction groups and ~6 to 7 months in the weight maintenance group
Colon cell proliferation rates will be determined using stable isotope labelled tracer methods in conjunction with sigmoid colon biopsy samples
Baseline and at 10% weight loss in calorie restriction groups and ~6 to 7 months in the weight maintenance group
Determine the acute effect of whey protein ingestion on skeletal muscle insulin sensitivity
Time Frame: Prior to starting the weight loss or maintenance intervention
Insulin sensitivity will be evaluated using the hyperinsulinemic-euglycemic clamp procedure in conjunction with stable isotope labeled tracer infusions
Prior to starting the weight loss or maintenance intervention
Determine the acute effect of whey protein ingestion on muscle protein metabolism
Time Frame: Prior to starting the weight loss or maintenance intervention
Rates of muscle protein synthesis, breakdown and net protein balance will be assessed using stable isotope labeled tracer methods during postabsorptive conditions and during insulin infusion with or without whey protein ingestion
Prior to starting the weight loss or maintenance intervention

Collaborators and Investigators

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

Sponsor

Washington University School of Medicine

Collaborators

National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK)

Publications and helpful links

The person responsible for entering information about the study voluntarily provides these publications. These may be about anything related to the study.

General Publications

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 (Actual)

January 1, 2012

Primary Completion (Actual)

March 1, 2017

Study Completion (Actual)

March 1, 2017

Study Registration Dates

First Submitted

February 20, 2012

First Submitted That Met QC Criteria

February 20, 2012

First Posted (Estimate)

February 24, 2012

Study Record Updates

Last Update Posted (Actual)

March 27, 2017

Last Update Submitted That Met QC Criteria

March 22, 2017

Last Verified

March 1, 2017

More Information

Terms related to this study

Additional Relevant MeSH Terms

Other Study ID Numbers

  • CRPS-201107354
  • 1R01DK094483-01A1 (U.S. NIH Grant/Contract)

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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