Vitamin A requirement for Chinese adults
Conditions
Interventions
A Low dose group:Supplemented with 200ug vitamin A daily for 4 months
B Middle dose group:Supplemented with 400ug vitamin A daily for 4 months
C high dose group:Supplemented with 600ug vitamin A daily for 4 months
D Control group:Supplemented with 0ug daily for 4 months
Sponsors
Nanjing Medical University
Eligibility
Sex/Gender
All
Age
35 Years to 55 Years
Inclusion criteria
Inclusion criteria: 1. Be willing and confident to cooperate with the investigatior; 2. With education level high than middle school and be able to help recording diets; 3. Aged 40-55 years old; 4. With normal weight and body mass index ranges from 18.5 to 28.0; 5. No habbits of smoking and wine.6.Serum concentration of vitamin A is in the normal range(>30ug/dl, <68ug/dl)
Exclusion criteria
Exclusion criteria: 1. Severe cardiovascular or high blood presure,maglinant tumor and diabetes; 2. Intakes of vitamin or mineral supplements before 1 month from screen.
Design outcomes
Primary
| Measure | Time frame |
|---|---|
| Liver vitamin A reserve before intervention;Serum concentration of vitamin A before intervention;Liver vitamin A reserve after intervention;Serum concentration of vitamin A after intervention; | — |
Secondary
| Measure | Time frame |
|---|---|
| Intakes of dietary retinol;Intakes of dierary ß-carotene;Intakes of dietary a-carotene;Intakes of dietary cryptoxanthin; | — |
Countries
China
Contacts
Public ContactZhixu Wang
Nanjing Medical University
Outcome results
None listed