A Pilot Study of the Effect of Dietary Fat Type and Amount on Vitamin D3 Absorption (MUFA/PUFA)

July 18, 2014 updated by: Tufts University
This study will examine whether the amount and type of fat, mono-unsaturated fat (MUFA) vs. poly-unsaturated fat (PUFA), in a meal affects the absorption of vitamin D, which is taken after that meal. The study hypothesis is that vitamin D3 absorption will be greater when fat is present vs. absent in the meal. A secondary hypothesis is that vitamin D3 absorption will be greater in the presence of a meal with a high MUFA/PUFA compared with a low MUFA/PUFA ratio.

Study Overview

Status

Status

Indicates the current recruitment status or the expanded access status.
Completed

Conditions

Conditions

The disease, disorder, syndrome, illness, or injury that is being studied. On ClinicalTrials.gov, conditions may also include other health-related issues, such as lifespan, quality of life, and health risks.

Intervention / Treatment

Intervention / Treatment

A process or action that is the focus of a clinical study. Interventions include drugs, medical devices, procedures, vaccines, and other products that are either investigational or already available. Interventions can also include noninvasive approaches, such as education or modifying diet and exercise.

Detailed Description

There is evidence that vitamin D has a favorable effect on bone and muscle. Many adults have low blood levels of 25-hydroxyvitamin D (25OHD) and consequently, vitamin D supplements are being widely recommended. The effect of a meal on the absorption of vitamin D is poorly understood. This single blind study will examine whether the amount and type of fat in the meal with which vitamin D is taken influences its absorption. Vitamin D dissolves in fat and so dietary fat may affect its absorption; moreover the type of fat with respect to mono- and poly-unsaturation may also influence absorption. This study should increase our understanding of how best to take vitamin D in order to achieve maximal absorption. Up to 65 healthy older men and women with 25OHDlevels in the insufficient range will be enrolled in order to get 60 completers in this 1-day study. They will randomized to one of three meal groups: high MUFA/PUFA (n=30), low MUFA/PUFA (n=15), or fat-free (n=15). Those in the high MUFA/PUFA group will also be randomized to a single dose of either 1,600 or 50,800 IU of vitamin D. All participants in the other two groups will receive the 50,800 IU dose. They will consume only the three meals provided during the study day. In the morning they will come to the Center for a blood draw, to consume their breakfast meal, and to take their assigned dose of vitamin D (part of which is labeled with the non-radioactive tracer, deuterium to enable direct assessment of vitamin D absorption). They will also complete questionnaires about their diet and health and have a DXA total body scan. They will be given a boxed lunch to eat at noon. They will return to HNRCA for blood draws at 6:00, 8:00, and 10:00 pm. They will have dinner at HNRCA after the 6:00 pm blood draw. They finish the study after the final blood draw. Participants who receive the higher dose of vitamin D, 50,800 IU, will be asked not to take more than 400 IU of vitamin D or 1000 mg per day of supplemental calcium or attend tanning salons for the month after completing the study, in order to minimize any risk of symptoms from the vitamin D. Blood draws include screening visit 20 cc, morning visit 15 cc, and three evening blood draws of 15, 15, and 15 cc, respectively, total 80 cc.

Study Type

Study Type

Describes the nature of a clinical study. Study types include interventional studies (also called clinical trials), observational studies (including patient registries), and expanded access.
Interventional

Enrollment (Actual)

Enrollment

The number of participants in a clinical study. The "anticipated" enrollment is the target number of participants that the researchers need for the study.
61

Phase

Phase

The stage of a clinical trial studying a drug or biological product, based on definitions developed by the U.S. Food and Drug Administration (FDA). The phase is based on the study's objective, the number of participants, and other characteristics. There are five phases: Early Phase 1 (formerly listed as Phase 0), Phase 1, Phase 2, Phase 3, and Phase 4. Not Applicable is used to describe trials without FDA-defined phases, including trials of devices or behavioral interventions.
  • 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
    • Massachusetts
      • Boston, Massachusetts, United States, 02111
        • Jean Mayer USDA Human Nutrition Research Center on Aging at Tufts 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

Eligibility Criteria

The key requirements that people who want to participate in a clinical study must meet or the characteristics they must have. Eligibility criteria consist of both inclusion criteria (which are required for a person to participate in the study) and exclusion criteria (which prevent a person from participating). Types of eligibility criteria include whether a study accepts healthy volunteers, has age or age group requirements, or is limited by sex.

Ages Eligible for Study

46 years and older (Adult, Older Adult)

Accepts Healthy Volunteers

No

Genders Eligible for Study

All

Description

Inclusion Criteria:

  • Caucasian men and women age 50 years and older
  • Women must be at least 1 year since last menses
  • Subjects must agree not to attend a tanning salon or increase their sun exposure between the screening and final study visits and, for those in the higher vitamin D dose group (50,800 IU), for one month after they have completed the study.
  • Subjects must agree not to take more than 400 IU of vitamin D (the amount in most multivitamins) or 1000 mg of calcium per day as their own supplements between the screening and final study visits and, for those in the higher vitamin D dose group (50,800 IU), for one month after completing the study (Note: no supplemental calcium or vitamin D is allowed on the study day.
  • Screening serum 25OHD of 25 to 29.5 ng/ml
  • Screening BMI 20 to 29.5 kg/m2
  • Screening plasma triglyceride concentrations below 150 mg/dL

Exclusion Criteria:

  • Uncontrolled type 2 diabetes with fasting blood sugar >140 mg/dl
  • GFR < 30 ml/min calculated from serum creatinine with use of the Modification of Diet in Renal Disease (MDRD) Study equation [7]
  • Screening fasting spot urinary calcium:creatinine ratio (Ca:Cr) > 0.325 (corresponding to a 24-hr urine calcium of 350 mg)
  • Screening serum calcium exceeding upper normal limit (reference range 8.3 -10.2 mg/dl)
  • Other abnormalities in screening labs, at the discretion of the study physician (PI)
  • Sarcoidosis
  • Malabsorption, Crohn's disease
  • Subjects with disorders of bone and mineral metabolism
  • Kidney stones - in the last 3 years
  • Evidence of chronic liver disease, including alcoholism
  • Cancer treatment in the last year (except basal cell carcinoma) or terminal illness
  • Use of lipid lowering medications, plant sterols, fish oil, or flaxseed oil
  • Treatment in the last 6 months with estrogen, raloxifene, calcitonin, or testosterone (vaginal estrogen okay)
  • Treatment in the last year with teriparatide or denosumab
  • Treatment in the last 2 years with bisphosphonates
  • Oral corticosteroid therapy for over 3 weeks within the last 6 months
  • Anticonvulsant therapy
  • High dose thiazide therapy (>37.5 mg per day)
  • Allergy to egg
  • Non-English speaking subjects (The food frequency questionnaire to be used in this study has not been validated in other languages. Thus, their diet data would not be able to be included in the analyses. As such, it is inappropriate to expose non-English speaking participants to the study risks, however small, when their data will not contribute to the study results.)

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: Single

Arms and Interventions

Participant Group / Arm

Participant Group / Arm

A group or subgroup of participants in a clinical trial that receives a specific intervention/treatment, or no intervention, according to the trial's protocol.
Intervention / Treatment

Intervention / Treatment

A process or action that is the focus of a clinical study. Interventions include drugs, medical devices, procedures, vaccines, and other products that are either investigational or already available. Interventions can also include noninvasive approaches, such as education or modifying diet and exercise.
Active Comparator: High MUFA/PUFA, 1600 IU vitamin D3
Subjects will receive 3 meals (1 day) with a high MUFA/PUFA ratio (20g/5g), along with 800 IU of vitamin D3 and 800 IU of deuterated vitamin D3
Dietary supplement: cholecalciferol
800 IU vitamin D3, 1 dose; 800 IU deuterated vitamin D3, 1 dose
Other Names:
  • vitamin D3
Dietary supplement: cholecalciferol
50,000 IU vitamin D3, 1 dose; 800 IU deuterated vitamin D3, 1 dose
Other Names:
  • vitamin D3
Dietary supplement: cholecalciferol
50,000 IU vitamin D3, 1 dose; 800 IU vitamin D3, 1 dose
Other Names:
  • vitamin D3
Active Comparator: High MUFA/PUFA, 50,800 IU vitamin D3
Subjects will receive 3 meals (1 day) with a high MUFA/PUFA ratio (20g/5g), along with 50,000 IU of vitamin D3 and 800 IU of deuterated vitamin D3
Dietary supplement: cholecalciferol
800 IU vitamin D3, 1 dose; 800 IU deuterated vitamin D3, 1 dose
Other Names:
  • vitamin D3
Dietary supplement: cholecalciferol
50,000 IU vitamin D3, 1 dose; 800 IU deuterated vitamin D3, 1 dose
Other Names:
  • vitamin D3
Dietary supplement: cholecalciferol
50,000 IU vitamin D3, 1 dose; 800 IU vitamin D3, 1 dose
Other Names:
  • vitamin D3
Active Comparator: Low MUFA/PUFA, 50,800 IU vitamin D3
Subjects will receive 3 meals (1 day) with a low MUFA/PUFA ratio (5g/20g), along with 50,000 IU of vitamin D3 and 800 IU of deuterated vitamin D3
Dietary supplement: cholecalciferol
800 IU vitamin D3, 1 dose; 800 IU deuterated vitamin D3, 1 dose
Other Names:
  • vitamin D3
Dietary supplement: cholecalciferol
50,000 IU vitamin D3, 1 dose; 800 IU deuterated vitamin D3, 1 dose
Other Names:
  • vitamin D3
Dietary supplement: cholecalciferol
50,000 IU vitamin D3, 1 dose; 800 IU vitamin D3, 1 dose
Other Names:
  • vitamin D3
Active Comparator: Fat free meal, 50,800 IU vitamin D3
Subjects will receive 3 fat-free meals (1 day) and 50,000 IU vitamin D3 and 800 IU of deuterated vitamin D3
Dietary supplement: cholecalciferol
800 IU vitamin D3, 1 dose; 800 IU deuterated vitamin D3, 1 dose
Other Names:
  • vitamin D3
Dietary supplement: cholecalciferol
50,000 IU vitamin D3, 1 dose; 800 IU deuterated vitamin D3, 1 dose
Other Names:
  • vitamin D3
Dietary supplement: cholecalciferol
50,000 IU vitamin D3, 1 dose; 800 IU vitamin D3, 1 dose
Other Names:
  • vitamin D3

What is the study measuring?

Primary Outcome Measures

Primary Outcome Measures

In a clinical study's protocol, the planned outcome measure that is the most important for evaluating the effect of an intervention/treatment. Most clinical studies have one primary outcome measure, but some have more than one.
Outcome Measure
Time Frame
The rate of vitamin D3 absorption after consuming meals with 3 different ratios of MUFA/PUFA content.
Time Frame: 10, 12 and 14 hours
10, 12 and 14 hours

Secondary Outcome Measures

Secondary Outcome Measures

In a clinical study's protocol, a planned outcome measure that is not as important as the primary outcome measure for evaluating the effect of an intervention but is still of interest. Most clinical studies have more than one secondary outcome measure.
Outcome Measure
Time Frame
The association between changes in plasma D3 and fatty acid profiles, specifically MUFAs.
Time Frame: 10, 12 and 14 hours
10, 12 and 14 hours

Collaborators and Investigators

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

Sponsor

Sponsor

The organization or person who initiates the study and who has authority and control over the study.
Tufts University

Collaborators

Collaborators

An organization other than the sponsor that provides support for a clinical study. This support may include activities related to funding, design, implementation, data analysis, or reporting.
Pfizer

Investigators

Investigators

A researcher involved in a clinical study. Related terms include site principal investigator, site sub-investigator, study chair, study director, and study principal investigator.
  • Principal Investigator: Bess Dawson-Hughes, M.D., Tufts Medical Center

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

Study Start

The actual date on which the first participant was enrolled in a clinical study. The "anticipated" study start date is the date that the researchers think will be the study start date.
January 1, 2012

Primary Completion (Actual)

Primary Completion

The date on which the last participant in a clinical study was examined or received an intervention to collect final data for the primary outcome measure. Whether the clinical study ended according to the protocol or was terminated does not affect this date. For clinical studies with more than one primary outcome measure with different completion dates, this term refers to the date on which data collection is completed for all the primary outcome measures. The "anticipated" primary completion date is the date that the researchers think will be the primary completion date for the study.
June 1, 2013

Study Completion (Actual)

Study Completion

The date on which the last participant in a clinical study was examined or received an intervention/treatment to collect final data for the primary outcome measures, secondary outcome measures, and adverse events (that is, the last participant's last visit). The "anticipated" study completion date is the date that the researchers think will be the study completion date.
June 1, 2013

Study Registration Dates

First Submitted

First Submitted

The date on which the study sponsor or investigator first submitted a study record to ClinicalTrials.gov. There is typically a delay of a few days between the first submitted date and the record's availability on ClinicalTrials.gov (the first posted date).
January 9, 2012

First Submitted That Met QC Criteria

First Submitted That Met QC Criteria

The date on which the study sponsor or investigator first submits a study record that is consistent with National Library of Medicine (NLM) quality control (QC) review criteria. The sponsor or investigator may need to revise and submit a study record one or more times before NLM's QC review criteria are met. It is the responsibility of the sponsor or investigator to ensure that the study record is consistent with the NLM QC review criteria.
January 9, 2012

First Posted (Estimate)

First Posted

The date on which the study record was first available on ClinicalTrials.gov after National Library of Medicine (NLM) quality control (QC) review has concluded. There is typically a delay of a few days between the date the study sponsor or investigator submitted the study record and the first posted date.
January 12, 2012

Study Record Updates

Last Update Posted (Estimate)

Last Update Posted

The most recent date on which changes to a study record were made available on ClinicalTrials.gov. There may be a delay between when the changes were submitted to ClinicalTrials.gov by the study's sponsor or investigator (the last update submitted date) and the last update posted date.
July 21, 2014

Last Update Submitted That Met QC Criteria

Last Update Submitted That Met QC Criteria

The most recent date on which the study sponsor or investigator submitted changes to a study record that are consistent with National Library of Medicine (NLM) quality control (QC) review criteria. It is the responsibility of the sponsor or investigator to ensure that the study record is consistent with the NLM QC review criteria.
July 18, 2014

Last Verified

Last Verified

The most recent date on which the study sponsor or investigator confirmed the information about a clinical study on ClinicalTrials.gov as accurate and current. If a study with a recruitment status of recruiting; not yet recruiting; or active, not recruiting has not been confirmed within the past 2 years, the study's recruitment status is shown as unknown.
July 1, 2014

More Information

Terms related to this study

Keywords

Additional Relevant MeSH Terms

Other Study ID Numbers

Other Study ID Numbers

Identifiers or ID numbers other than the NCT number that are assigned to a clinical study by the study's sponsor, funders, or others. These numbers may include unique identifiers from other trial registries and National Institutes of Health grant numbers.
  • 2730

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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