A study published in the European Journal of Human Genetics (2006) explores sex-specific, male-line transgenerational responses in humans. The research, conducted using data from the Avon Longitudinal Study of Parents and Children (ALSPAC) and the Överkalix cohorts in Sweden, investigates how paternal environmental exposures, such as smoking and food supply during the slow growth period (SGP) in mid-childhood, influence the health and development of offspring and grandchildren. The study found that early paternal smoking before age 11 years was associated with higher body mass index (BMI) in sons but not daughters. Additionally, the food supply of paternal grandparents during their SGP was linked to the mortality risk ratios (RR) of their grandsons and granddaughters, with the paternal grandfather's food supply affecting grandsons and the paternal grandmother's food supply affecting granddaughters. These effects were observed when exposure occurred during the SGP or fetal/infant life, but not during puberty. The study suggests that these transgenerational effects may be mediated by sex chromosomes, X and Y. The findings highlight the importance of the SGP in transmitting environmental information across generations and indicate that these responses could be part of an evolved adaptive mechanism. The research also emphasizes the need for further investigation into the underlying mechanisms, including epigenetic changes, and the potential role of the Y chromosome in transmitting environmental information through the male line. The study underscores the significance of considering transgenerational effects in gene-environment interactions, particularly in the context of health and development. It provides evidence that sex-specific, male-line transgenerational responses exist in humans, adding a new dimension to the understanding of how environmental factors influence health outcomes across generations.A study published in the European Journal of Human Genetics (2006) explores sex-specific, male-line transgenerational responses in humans. The research, conducted using data from the Avon Longitudinal Study of Parents and Children (ALSPAC) and the Överkalix cohorts in Sweden, investigates how paternal environmental exposures, such as smoking and food supply during the slow growth period (SGP) in mid-childhood, influence the health and development of offspring and grandchildren. The study found that early paternal smoking before age 11 years was associated with higher body mass index (BMI) in sons but not daughters. Additionally, the food supply of paternal grandparents during their SGP was linked to the mortality risk ratios (RR) of their grandsons and granddaughters, with the paternal grandfather's food supply affecting grandsons and the paternal grandmother's food supply affecting granddaughters. These effects were observed when exposure occurred during the SGP or fetal/infant life, but not during puberty. The study suggests that these transgenerational effects may be mediated by sex chromosomes, X and Y. The findings highlight the importance of the SGP in transmitting environmental information across generations and indicate that these responses could be part of an evolved adaptive mechanism. The research also emphasizes the need for further investigation into the underlying mechanisms, including epigenetic changes, and the potential role of the Y chromosome in transmitting environmental information through the male line. The study underscores the significance of considering transgenerational effects in gene-environment interactions, particularly in the context of health and development. It provides evidence that sex-specific, male-line transgenerational responses exist in humans, adding a new dimension to the understanding of how environmental factors influence health outcomes across generations.