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A Household-Based Dietary Intervention Study of Vitamin D Fortified Bread in Irish Families
Sponsor: University College Cork
Summary
Vitamin D deficiency is common. It is caused by limited sun availability together with a low supply of vitamin D in the food system. There is a high prevalence of low vitamin D status around the world. In Ireland, our relatively northern latitude and prevailing weather mean that UVB availability for skin synthesis of vitamin D is limited in this country and our population relies on the dietary supply of vitamin D to prevent deficiency. Thus, the endemic Irish problem of vitamin D malnutrition is due to the lack of vitamin D in our food system. Dietary guidelines cannot address this issue because foods naturally rich in vitamin D are very few and infrequently consumed. The FamDBread study will test the hypothesis that a vitamin D-fortified bread as part of a healthy diet that includes vitamin D-fortified foods is effective in preventing low vitamin D status during winter, and safe for families to consume.
Official title: Fam-D-Bread: A Household-Based Dietary Intervention Study of Vitamin D Fortified Bread in Irish Families
Key Details
Gender
All
Age Range
5 Years - 59 Years
Study Type
INTERVENTIONAL
Enrollment
390
Start Date
2025-11-17
Completion Date
2026-03-31
Last Updated
2026-03-18
Healthy Volunteers
Yes
Conditions
Interventions
Fortified Bread
Intervention group will be supplied with fortified bread delivering \>20 μg vitamin D3 in a daily portion and will receive dietary advice to incorporate fortified foods that are commonly available on the market in their diet.
Unfortified bread
Placebo control group will be supplied with unfortified bread and will receive dietary advice to incorporate fortified foods that are commonly available on the market in their diet.
Locations (2)
Human Nutrition Studies Unit, School of Food and Nutritional Sciences
Cork, Co. Cork, Ireland
UCD Institute of Food and Health
Dublin, Ireland