This twin study of nearly 14,000 UK adolescents found that body dissatisfaction at age 16 was linked to eating disorder symptoms at 21 and depression at 26. Comparing twins helped researchers show these were likely causal relationships, not just correlations, though genetics also played a substantial role.
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Lorna Staines discusses a recent Swedish cross-sectional study of 16,255 adolescent twins, which looks at the mental health risks of using psychedelics in the real world.
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This review assessing the agreement of dental caries experience between monozygotic (MZ) and dizygotic twins (DZ) included 19 studies. While the findings indcate a possible a genetic influence the certainty of evidence is very low so the findings should be interpreted very cautiously.
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