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Diabet Med. 1998 Sep;15(9):730-8.

Cow's milk consumption, disease-associated autoantibodies and type 1 diabetes mellitus: a follow-up study in siblings of diabetic children. Childhood Diabetes in Finland Study Group.

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  • 1School of Public Health, University of Tampere, Finland.


Evidence from case-control studies for the diabetogenicity of introduction of cow's milk-based formulas at early age in infancy is inconclusive. We followed siblings of children with Type 1 diabetes mellitus (Type 1 DM) to investigate a possible relationship between cow's milk consumption during infancy or later in childhood and the emergence of diabetes-associated autoantibodies and progression to clinical Type 1 DM. A cohort of 725 initially unaffected 0 to 25-year-old siblings of 801 index children with Type 1 DM diagnosed in 1986-1989 participated in the study (82% of those invited). The siblings were observed for Type 1 DM associated autoantibodies at intervals of 3-12 months for 4 years, starting from the diagnosis of Type 1 DM in the index child. The follow-up for Type 1 DM started at the same time and ended on 31 October 1995. The combined prevalence of Type 1 DM associated autoantibodies (islet cell antibodies (ICA), insulin autoantibodies (IAA), GAD autoantibodies (GADA), and/or antibodies to the insulinoma associated cDNA2 protein (IA-2A)) was 13.6% (95/697) at the beginning of the study. Of the initially seronegative siblings, 7.5% (45/602) converted to antibody positivity during 4 years, and of all siblings 4.6% (33/725) developed Type 1 DM during the total follow-up time. The age at introduction of supplementary milk feeding was not significantly related to seroconversion to positivity for Type 1 DM associated autoantibodies or to the development of Type 1 DM in the siblings. When adjusted for age, sex, infant feeding patterns, and maternal age and education, high milk consumption in childhood (> or =3 glasses daily) was associated with more frequent emergence of Type 1 DM-associated autoantibodies than low consumption (<3 glasses daily) (adjusted odds ratio 3.97, 95% confidence interval 1.3-11.7, p = 0.01). There was a non-significant association between high milk consumption and progression to clinical Type 1 DM (adjusted hazard ratio 2.75, 95% confidence interval 0.9-8.4, p = 0.07). To conclude, this study suggests that high consumption of cow's milk during childhood may be associated both with seroconversion to positivity for diabetes-associated autoantibodies and progression to clinical Type 1 DM among siblings of children with diabetes.

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