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Vitamin D Fortified Cheese and Well-being in the Institutionalized Elderly

The recruitment status of this study is unknown. The completion date has passed and the status has not been verified in more than two years.
Verified March 2012 by Reinhold Vieth, University of Toronto.
Recruitment status was:  Active, not recruiting
Information provided by (Responsible Party):
Reinhold Vieth, University of Toronto Identifier:
First received: March 13, 2012
Last updated: March 14, 2012
Last verified: March 2012
The investigators hypotheses is that the consumption of the investigators vitamin D fortified cheese will result in an increase in serum 25-hydroxy vitamin D levels in older institutionalized adults. Also, the consumption of the cheese with the higher amount of vitamin D will result in an improvement in wellbeing scores.

Condition Intervention
The Focus is to Assess 25-hydroxyvitamin D Levels and Well-being Dietary Supplement: High dose Dietary Supplement: Reference dose

Study Type: Interventional
Study Design: Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: Quadruple (Participant, Care Provider, Investigator, Outcomes Assessor)
Official Title: Bioavailability of Casein-bound Vitamin D From Fortified Cheese and Its Effects on the Well-being of the Institutionalized Elderly

Resource links provided by NLM:

Further study details as provided by Reinhold Vieth, University of Toronto:

Primary Outcome Measures:
  • The bioavailability of vitamin D from cheddar cheese fortified with vitamin D, in older institutionalized adults [ Time Frame: 2 months ]
    We are adminstering 2 doses of vitamin D fortified cheese. One cheese contains a higher 28,000 IU/week dose that we expect to see health benefits with. The other cheese contains a 200IU/week dose that is similar to the current milk fortification practice in Canada (100IU per serving).

Secondary Outcome Measures:
  • A change in wellbeing scores using an SF-36 survey in the older institutionalized adults [ Time Frame: 2 months ]
    We have previously shown that a group of adults showed an improvement in their wellbeing scores after the consumption of 28,000 IU/week of vitamin D during the winter months. Therefore, we will assess whether well-being changes in older institutionalized adults after the consumption of the vitamin D fortifed cheese, by using an SF-36 well-being survey.

Enrollment: 28
Study Start Date: February 2012
Estimated Study Completion Date: April 2012
Estimated Primary Completion Date: April 2012 (Final data collection date for primary outcome measure)
Arms Assigned Interventions
Active Comparator: High dose Dietary Supplement: High dose
This arm of the study receives a higher dose of the vitamin D fortified cheese (28,000IU/ 50g of cheddar cheese eaten once a week).
Active Comparator: Reference dose Dietary Supplement: Reference dose
This arm of the study receives a lower dose of the vitamin D fortified cheese (200IU/ 50g of cheddar cheese eaten once a week).

Detailed Description:

The institute of medicine increased the dietary reference intakes of vitamin D for all of the age groups. The Recommended Daily Allowance (RDA) is now 800 IU for older adults over the age of 70, and the Tolerable Upper Level (UL) is 4000 IU daily. Canadians are known to have an inadequate vitamin D status, and older institutionalized adults are particularly susceptible to this. One strategy to correct this is to fortify more kinds of foods with vitamin D. We have already demonstrated that we can get vitamin D into cheddar cheese and it is as biologically available as vitamin D in the liquid supplement.

This new project aims to optimize the fortification process and deliver all of the vitamin D into cheddar cheese, and to measure its bioavailability and related changes in well-being during winter. We will assess the well being of the older institutionalized adults by administering the SF-36v2 health survey.


Ages Eligible for Study:   70 Years and older   (Senior)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   Yes

Inclusion Criteria:

  • Lactose intolerance
  • Generally "Healthy", unless disease status deemed clinically significant and unable to participate by the attending physician.

Exclusion Criteria:

  • Hypercalcemia/hypercalciuria
  • Interfering medications
  • Significant sun exposure in the months before and during the study
  Contacts and Locations
Choosing to participate in a study is an important personal decision. Talk with your doctor and family members or friends about deciding to join a study. To learn more about this study, you or your doctor may contact the study research staff using the Contacts provided below. For general information, see Learn About Clinical Studies.

Please refer to this study by its identifier: NCT01555424

Canada, Ontario
Kingsway Arms- Aurora Retirement Centre
Aurora, Ontario, Canada, L4G 2C7
Sponsors and Collaborators
University of Toronto
Principal Investigator: Reinhold Vieth, PhD,FCACB U of Toronto, Mount Sinai Hospital
Principal Investigator: Pierre Geoffroy, MD Aurora Retirement Centre
  More Information

Responsible Party: Reinhold Vieth, Dr., University of Toronto Identifier: NCT01555424     History of Changes
Other Study ID Numbers: M2327
Study First Received: March 13, 2012
Last Updated: March 14, 2012

Keywords provided by Reinhold Vieth, University of Toronto:
25-hydroxyvitamin D
Institutionalized seniors
SF-36 survey

Additional relevant MeSH terms:
Vitamin D
Growth Substances
Physiological Effects of Drugs
Bone Density Conservation Agents processed this record on September 21, 2017