The Effects of Obesity and Protein Intake on the Kidney

August 26, 2015 updated by: Allon Friedman, MD, Indiana University School of Medicine
The purpose of this study is to determine if being overweight and eating lots of protein causes separate changes in the kidney that lead to kidney disease over time. These questions are important because the number of people who have kidney disease is quickly growing. If being overweight and eating lots of protein is found to cause kidney disease, then doctors may be able to limit the number of people with kidney disease by recommending weight loss and eating less protein

Study Overview

Status

Completed

Conditions

Intervention / Treatment

Detailed Description

The purpose of this study is to test the hypothesis that being obese leads to changes in kidney function that are independent of, and enhanced by, high dietary protein intake. Kidney function will be measured by the kidney's ability to filter blood and by the amount of protein in the urine. The hypothesis will be tested in the following manner: The first part of the study will involve a crossover design comparing kidney function in obese people with stable weights on a low and high protein diet ("Low/High Protein Study"). The second part of the study will compare kidney function in obese people before and after weight reduction surgery ("Before/After Surgery Study"). Since certain changes in kidney function may lead to kidney disease over time, it is important to confirm the effects of obesity and dietary protein intake on the kidney, especially with the current rise in obese people and the popularity of high protein diets.

Study Type

Interventional

Enrollment (Actual)

50

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
    • Indiana
      • Indianapolis, Indiana, United States, 46122
        • University Hospital

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 and older (Adult, Older Adult)

Accepts Healthy Volunteers

Yes

Genders Eligible for Study

All

Description

Inclusion Criteria:

  • Greater than 18 years of age
  • Ability to give informed consent
  • Not pregnant and using appropriate contraceptive methods, or not of childbearing potential
  • BMI of 30 or higher

Exclusion Criteria:

  • Iodine or shellfish allergy
  • History of adverse reaction to intravenous contrast
  • Dialysis dependence
  • Diagnosis of diabetes mellitus or taking medicine for diabetes mellitus

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: Diagnostic
  • Allocation: Randomized
  • Interventional Model: Crossover Assignment
  • Masking: Double

Arms and Interventions

Participant Group / Arm
Intervention / Treatment
Experimental: low protein
Behavioral: Diet
crossover low vs high protein diet before and after weight loss
Other Names:
  • Diet 1
  • Diet 2

What is the study measuring?

Primary Outcome Measures

Outcome Measure
Time Frame
glomerular filtration rate
Time Frame: days
days

Collaborators and Investigators

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

Sponsor

Indiana University School of Medicine

Collaborators

National Institutes of Health (NIH)

Investigators

  • Principal Investigator: Allon Friedman, MD, Indiana University

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

April 1, 2004

Primary Completion (Actual)

April 1, 2014

Study Completion (Actual)

April 1, 2014

Study Registration Dates

First Submitted

October 25, 2005

First Submitted That Met QC Criteria

October 25, 2005

First Posted (Estimate)

October 27, 2005

Study Record Updates

Last Update Posted (Estimate)

August 28, 2015

Last Update Submitted That Met QC Criteria

August 26, 2015

Last Verified

August 1, 2015

More Information

Terms related to this study

Keywords

Additional Relevant MeSH Terms

Other Study ID Numbers

  • 0309-03
  • K23RR019615-01A1 (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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