Effects of Vitamin D Supplementation in Obesity

August 1, 2012 updated by: University of Aarhus

Effects of Vitamin D Supplementation in Vitamin D Deficient Obese Subject.

Obesity is an increasing health problem with numerous metabolic complications. Vitamin D deficiency is common in obesity, and in epidemiological studies vitamin D deficiency has been linked to metabolic complications, such as type 2 diabetes, insulin resistance and cardiovascular disease, as well as myopathy, osteoporosis and depression. In obesity, a low grade inflammation is present in the fat tissue, thereby releasing inflammatory molecules to the blood stream. In cell line studies as well as small clinical studies vitamin D has been shown to have the ability to reduce inflammation and cell growth.

In the present study the investigators wish to investigate the effect of vitamin D on fat-, muscle and bone metabolism. 30 healthy obese subjects will be treated with cholecalciferol 175 micrograms daily for 6 months and will be compared with 30 healthy obese subjects treated with placebo.

The investigators hypothesize that restoring vitamin D levels in vitamin D deficient obese subject will reduce inflammation and thereby reduce obesity-related complications.

The effect will be evaluated as follows:

  • Levels of circulating inflammatory markers will be examined in blood samples collected prior to and after treatment.
  • Effects on fat- and muscle metabolism will be evaluated in fat- and muscle samples taken before and after treatment.
  • Effects on fat distribution will be evaluated by MRI scan before and after treatment.
  • Effects on insulin sensitivity will be evaluated by hyperinsulinaemic euglycaemic clamp performed on a subgroup of subjects with impaired fasting glucose.
  • Effects on bone marrow density will be evaluated by DEXA scans before and after treatment.
  • Effects on quality of life and depression score will be evaluated by questionnaires used before and after treatment.

Study Overview

Status

Completed

Conditions

Intervention / Treatment

Study Type

Interventional

Enrollment (Actual)

55

Phase

  • Phase 4

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

  • Denmark
      • Aarhus, Denmark
        • Dept. of Endocrinology and Metabolism, Aarhus 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 to 50 years (Adult)

Accepts Healthy Volunteers

Yes

Genders Eligible for Study

All

Description

Inclusion Criteria:

  • Healthy obese (BMI 30 - 45 kg/m2)
  • 25(OH) vitamin D < 50 nmol/l

Exclusion Criteria:

  • Diabetes,
  • Pregnancy or non-safe contraception,
  • Vitamin D treatment within 3 months,
  • Hypercalcaemia, renal failure,
  • Liver failure, non eligibility for MRI-scan,
  • Severe osteomalacia,
  • Allergy towards study drug

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: Double

Arms and Interventions

Participant Group / Arm
Intervention / Treatment
Placebo Comparator: placebo
Drug: placebo
oral placebo tablets similar to active comparator
Active Comparator: cholecalciferol
Drug: Cholecalciferol
oral cholecalciferol tablets of 175 micrograms daily for 6 months
Other Names:
  • vitamin D

What is the study measuring?

Primary Outcome Measures

Outcome Measure
Time Frame
Effect on circulating inflammatory markers
Time Frame: 6 months
6 months

Secondary Outcome Measures

Outcome Measure
Time Frame
change in fat distribution
Time Frame: 6 months
6 months
change in insulin sensitivity
Time Frame: 6 months
6 months
change in bone mineral density
Time Frame: 6 months
6 months
change in quality of life
Time Frame: 6 months
6 months
change in depression score
Time Frame: 6 months
6 months
change in muscle function
Time Frame: 6 months
6 months
change in fat- and muscle metabolism
Time Frame: 6 months
6 months

Collaborators and Investigators

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

Sponsor

University of Aarhus

Investigators

  • Principal Investigator: Louise Wamberg, Dr., Aarhus University Hospital

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

January 1, 2010

Primary Completion (Actual)

December 1, 2011

Study Completion (Actual)

July 1, 2012

Study Registration Dates

First Submitted

December 8, 2009

First Submitted That Met QC Criteria

December 18, 2009

First Posted (Estimate)

December 21, 2009

Study Record Updates

Last Update Posted (Estimate)

August 2, 2012

Last Update Submitted That Met QC Criteria

August 1, 2012

Last Verified

August 1, 2012

More Information

Terms related to this study

Additional Relevant MeSH Terms

Other Study ID Numbers

  • 2008-005581-31

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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