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Sponsors and Collaborators: |
Radboud University Dutch Dairy Association |
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Information provided by: | Radboud University |
ClinicalTrials.gov Identifier: | NCT00128752 |
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.
Condition | Intervention |
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Healthy |
Behavioral: absorption and conversion of beta-carotene in human gastrointestinal (GI) tract |
Study Type: | Interventional |
Study Design: | Prevention, Randomized, Open Label, Dose Comparison, Crossover Assignment, Bio-availability Study |
Official Title: | Bioefficacy and Bioavailability of Beta-Carotene in Oil and in a Mixed Diet in Healthy Subjects Measured Using Specifically 13C-Labelled Beta-Carotene and Retinol |
Estimated Enrollment: | 24 |
Study Start Date: | March 2003 |
Estimated Study Completion Date: | October 2003 |
Ages Eligible for Study: | 18 Years to 50 Years |
Genders Eligible for Study: | Both |
Accepts Healthy Volunteers: | Yes |
Inclusion Criteria:
Exclusion Criteria:
Netherlands, Gelderland | |
Radboud University Nijmegen Medical Centre | |
Nijmegen, Gelderland, Netherlands, 6500HB |
Study Director: | Ton HJ Naber, MD PhD | Radboud University |
Principal Investigator: | Clive E West, PhD DSc | Radboud University |
Study Chair: | Carolien A Bouwman, MSc | Radboud University |
Study ID Numbers: | CARO-2002-12-12-NZO, NZO-2002-07 |
Study First Received: | August 9, 2005 |
Last Updated: | August 26, 2005 |
ClinicalTrials.gov Identifier: | NCT00128752 |
Health Authority: | Netherlands: The Central Committee on Research Involving Human Subjects (CCMO) |
vitamin A beta Carotene diet nutrition nutritional requirements |
Beta Carotene Retinol palmitate Vitamin A Healthy Carotenoids |
Antioxidants Molecular Mechanisms of Pharmacological Action Growth Substances Vitamins |
Physiological Effects of Drugs Micronutrients Protective Agents Pharmacologic Actions |