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Intake of vitamin D and risk of type 1 diabetes: a birth-cohort study. Hyppönen E, Läärä E, Reunanen A, Järvelin MR, Virtanen SM. Lancet. 2001 Nov 3;358(9292):1500-3. PMID: 11705562 doi:10.1016/S0140-6736(01)06580-1 INTERPRETATION: Dietary vitamin D supplementation is associated with reduced risk of type 1 diabetes. Ensuring adequate vitamin D supplementation for infants could help to reverse the increasing trend in the incidence of type 1 diabetes.

Infant vitamin d supplementation and allergic conditions in adulthood: northern Finland birth cohort 1966. Hyppönen E, Sovio U, Wjst M, Patel S, Pekkanen J, Hartikainen AL, Järvelinb MR. Ann N Y Acad Sci. 2004 Dec;1037:84-95. PMID: 15699498

To conclude, our findings suggest an association between large-dose vitamin D supplementation in infancy and an increased risk of atopy, allergic rhinitis, and asthma later in life. Further study is required to determine whether these observations could imply that vitamin D supplementation in infancy may have long-term effects on immune regulation, or if they reflect some unmeasured determinants of vitamin D supplementation Infant vitamin d supplementation and allergic conditions in adulthood: northern Finland birth cohort 1966. Hyppönen E, Sovio U, Wjst M, Patel S, Pekkanen J, Hartikainen AL, Järvelinb MR. Ann N Y Acad Sci. 2004 Dec;1037:84-95. DOI: 10.1196/annals.1337.013 PMID: 15699498

Vitamin D supplementation during the first year of life and risk of schizophrenia: a Finnish birth cohort study. McGrath J, Saari K, Hakko H, Jokelainen J, Jones P, Järvelin MR, Chant D, Isohanni M. Schizophr Res. 2004 Apr 1;67(2-3):237-45. PMID: 14984883 Conclusion: Vitamin D supplementation during the first year of life is associated with a reduced risk of schizophrenia in males. Preventing hypovitaminosis D during early life may reduce the incidence of schizophrenia.