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The CARO Study - Bioefficacy of Beta-Carotene in Oil and in a Mixed Diet in Healthy Subjects

NCT00128752 · Status: COMPLETED · Phase: NA · Type: INTERVENTIONAL · Enrollment: 24

Last updated 2005-08-29

No results posted yet for this study

Summary

A controlled dietary intervention study will be carried out based on the stable isotope method the investigators have developed to quantify both the absorption of beta-carotene and its bioconversion to retinol in oil and in a mixed diet. For 6 weeks the participants will consume 2 capsules/day, 7 days/week with each capsule containing 50-mg \[13C10\] beta-carotene and 50-mg \[13C10\] retinyl palmitate. For three weeks they will consume a diet with high levels of beta-carotene in vegetables and fruits and for the other 3 weeks they will consume a diet with low levels of beta-carotene in vegetables and fruits supplemented with an extra amount of beta-carotene in oil. Samples of blood and faeces will be taken.

The study hypothesis is that the absorption of beta-carotene in oil in comparison with the absorption of beta-carotene in a mixed diet differs by a factor of 3 to 6. The investigators want to measure the influence of the food matrix of vegetables and fruits on the absorption of beta-carotene in healthy humans on a western diet.

Conditions

  • Healthy

Interventions

BEHAVIORAL

absorption and conversion of beta-carotene in human gastrointestinal (GI) tract

Sponsors & Collaborators

  • Dutch Dairy Organization (NZO)

    collaborator OTHER

  • Radboud University Medical Center

    lead OTHER

Principal Investigators

  • Ton HJ Naber, MD PhD · Radboud University Medical Center

  • Clive E West, PhD DSc · Radboud University Medical Center

  • Carolien A Bouwman, MSc · Radboud University Medical Center

Study Design

Allocation
RANDOMIZED
Purpose
PREVENTION
Masking
NONE
Model
CROSSOVER

Eligibility

Min Age
18 Years
Max Age
50 Years
Sex
ALL
Healthy Volunteers
Yes

Timeline & Regulatory

Start
2003-03-31
Completion
2003-10-31

Countries

  • Netherlands

Study Locations

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Read the full study record

This page highlights key information. For complete eligibility criteria, study locations, investigator contacts, and the full protocol, visit the original record on ClinicalTrials.gov.

View NCT00128752 on ClinicalTrials.gov