Vitamin D Status During Adolescence and the Impact of Lifestyle Changes: 2 Years’ Follow-up From the Fit Futures Study
Authors' conclusion
Severe vitamin D deficiency was prevalent throughout adolescence. Lifestyle changes may alter s-25(OH)D levels in this age group.
Study context
- Population
- Arctic adolescents at 69°N in Norway, s-25(OH)D measured in first and third year of upper secondary school (median age 16 and 18 years)longitudinal data
- Participants
- 589 adolescents
- Exposure
- Girls vs Boys
- Girlsn = 309
- Boysn = 280
- Outcome
- Change in vitamin D status (s-25(OH)D) over 2 years in adolescence
- Follow-up
- FF1 (median age 16) and FF2 (median age 18)
Methodological details2-year follow-up
- 2-year follow-up
Main finding
As reported in the abstract
Vitamin D status (s-25(OH)D) · FF1 and FF2
- s-25(OH)D <50 nmol/L, FF1
- 73.7%
- s-25(OH)D <50 nmol/L, FF2
- 77.1%
- s-25(OH)D <30 nmol/L, FF1
- 35.7%
- s-25(OH)D <30 nmol/L, FF2
- 40.9%
- Severely deficient (<30 nmol/L) in FF1 who remained severely deficient in FF2
- 73.3%
Observational data: associations, not effects.
Further findings
Severe vitamin D deficiency (s-25(OH)D <30 nmol/L) persistence · FF1 to FF2
- Of those with s-25(OH)D <30 nmol/L in FF1, remained severely deficient in FF2
- 73.3%
Association of lifestyle changes with s-25(OH)D at FF2, boys (regression controlling for baseline s-25(OH)D)
- Increase in UV exposure, beta (nmol/L); CI
- 12.9; 9.1, 16.7
- Controlling for baseline s-25(OH)D levels
Association of lifestyle changes with s-25(OH)D at FF2, girls (regression controlling for baseline s-25(OH)D)
- Decreased vitamin/mineral supplement intake, beta (nmol/L); CI
- −6.7; −10.2, −3.1
- Increased UV exposure, beta (nmol/L); CI
- 10.8; 7.0, 14.7
- Combined hormonal contraceptive exposure in FF2, beta (nmol/L); CI
- 12.1; 6.0, 18.1
- Controlling for baseline s-25(OH)D levels
Original publication
Vitamin D Status During Adolescence and the Impact of Lifestyle Changes: 2 Years’ Follow-up From the Fit Futures Study. J Clin Endocrinol Metab. Published 13 November 2023. doi:10.
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