The Effect of Severe Weight Loss and Protein Intake on Bone

January 28, 2022 updated by: Sue A. Shapses, Ph.D., RD, Rutgers University

Nutritional Regulation of Bone - Aim 2

The purpose of this study is to learn whether the amount of dietary protein can influence bone health during the weight loss after weight loss surgery.

Study Overview

Status

Terminated

Conditions

Intervention / Treatment

Detailed Description

It is unclear whether the amount of protein in the diet during caloric restriction influences bone density. This information is important for determining optimal nutrient requirements during weight loss. This study will examine usual and higher dietary protein intake during severe weight loss following weight loss surgery on bone turnover, mass and quality in women, with the hypothesis that higher protein intake will reduce bone turnover and loss, and/or prevent the changes in bone quality associated with severe weight loss in women ages 18 to 70 years.

Participants will be randomly assigned to one of 2 groups: A) weight loss with recommended level of protein intake, or B) weight loss with higher protein intake. A dietitian will provide instructions for a reduced calorie, well balanced diet throughout the 12-month study using a nutrition-education behavior- modification program. Participants will have the opportunity to speak with the dietitian about their diet by phone, or on-site twice per month. In addition they will be asked to take a daily vitamin/mineral supplement and, depending on their usual food intake, they may be asked to take a calcium tablet to meet the recommended intake throughout the study period. Bone, mineral, protein and lipid markers, and hormones that influence bones will be measured. These measurements will provide information about body composition (fat, muscle mass, and bone mineral density).

Study Type

Interventional

Enrollment (Actual)

5

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
    • New Jersey
      • New Brunswick, New Jersey, United States, 08901
        • Rutgers University

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

18 years to 70 years (Adult, Older Adult)

Accepts Healthy Volunteers

No

Genders Eligible for Study

Female

Description

Inclusion Criteria:

  • Women ages 18 to 70 who are undergoing gastric bypass surgery
  • Must live in the geographic vicinity of Rutgers University

Exclusion Criteria:

  • Currently on any medication known to influence calcium or bone metabolism, including HRT, or with evidence of diseases known to influence calcium metabolism (i.e. metabolic bone disease, hyperparathyroidism, untreated thyroid disease, significant immune, hepatic, or renal disease, significant cardiac disease [i.e., heart attack or stroke in the past 6 months., abnormal EKG], active malignancy or cancer therapy within the past year)
  • History of kidney stones
  • Weight gain or weight loss (5% of body wt) within 3 months prior to recruitment
  • Participation in other investigational studies during the 12-month study period
  • Usually have a very high or low intake of calcium (more than 1500 or less than 500 mg per day)

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
Experimental: 1
High Dietary Protein
Behavioral: Caloric restriction, high protein
Weight loss with higher protein (35%) intake
Behavioral: Nutrition Education
Participants will have the opportunity to speak with the dietitian about their diet by phone, or on-site twice per month
Active Comparator: 2
Normal Dietary Protein
Behavioral: Nutrition Education
Participants will have the opportunity to speak with the dietitian about their diet by phone, or on-site twice per month
Behavioral: Caloric restriction; normal protein
Weight loss with normal level of protein (18%) intake

What is the study measuring?

Primary Outcome Measures

Outcome Measure
Time Frame
Changes in Bone mineral density and quality
Time Frame: one year
one year

Secondary Outcome Measures

Outcome Measure
Time Frame
Changes in serum and urine bone markers, hormones, and proteins
Time Frame: one year
one year

Collaborators and Investigators

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

Sponsor

Rutgers University

Collaborators

National Institute on Aging (NIA)

Investigators

  • Principal Investigator: Sue A. Shapses, PhD, RD, Rutgers University, Nutritional Sciences

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

March 1, 2010

Primary Completion (Actual)

May 1, 2015

Study Completion (Actual)

January 1, 2016

Study Registration Dates

First Submitted

May 10, 2007

First Submitted That Met QC Criteria

May 10, 2007

First Posted (Estimate)

May 14, 2007

Study Record Updates

Last Update Posted (Actual)

February 1, 2022

Last Update Submitted That Met QC Criteria

January 28, 2022

Last Verified

January 1, 2022

More Information

Terms related to this study

Keywords

Additional Relevant MeSH Terms

Other Study ID Numbers

  • AG0082
  • 5R01AG012161 (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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