Study: Paternal nicotine exposure alters offspring glucose metabolism in mice
Mouse study shows paternal nicotine exposure alters offspring glucose metabolism and may raise diabetes risk, reported in Journal of the Endocrine Society.
A new study in the Journal of the Endocrine Society reports that paternal nicotine exposure can change how offspring process sugar, raising concerns about inherited metabolic risk. The research, conducted in mice, found that fathers given nicotine produced descendants with measurable differences in glucose regulation. These findings suggest that paternal nicotine exposure — independent of other tobacco products — may influence diabetes-related pathways in the next generation.
Journal findings and primary results
The study was led by Raquel Chamorro-Garcia and colleagues at the University of California, Santa Cruz and compared offspring of nicotine-exposed male mice with those sired by unexposed controls. Researchers observed clear metabolic differences between the two groups, including altered blood glucose measures and changes in insulin levels. The paper frames these outcomes as evidence that paternal exposures can have biological consequences for offspring metabolism.
Experimental design isolates nicotine’s role
Investigators administered pure nicotine to male mice via drinking water to isolate the compound’s effects from other cigarette or e-cigarette constituents. Offspring were tracked and tested for fasting glucose, circulating insulin and liver function markers to assess metabolic status. By restricting exposure to nicotine alone, the team aimed to determine whether nicotine itself — rather than combustion byproducts or flavoring additives — could drive intergenerational metabolic changes.
Sex-specific metabolic differences in offspring
Results differed by sex: female offspring of nicotine-exposed fathers had lower fasting glucose and reduced insulin levels compared with control females. Male offspring also displayed reduced blood glucose and distinct alterations in liver function tests, a profile that may be related to metabolic dysfunction-associated steatotic liver disease. The sex-specific pattern suggests that paternal nicotine exposure interacts with developmental or hormonal pathways differently in male and female descendants.
Implications for preconception male health
Chamorro-Garcia emphasized that these findings highlight the importance of considering male health before conception, noting that paternal behaviors may influence children’s long-term risk for chronic diseases. The study authors argue that preconception care frameworks — which traditionally focus on maternal health — should incorporate counseling on tobacco and nicotine use for prospective fathers. If replicated and extended to humans, such evidence could alter messaging around smoking, vaping and cessation timing relative to family planning.
Public health context and diabetes burden
The research arrives amid a large and growing diabetes burden in the United States, where an estimated 40.1 million people live with the condition and more than 12 percent of the population is affected. Diabetes increases the risk of cardiovascular, renal and neurological complications and represents a substantial lifetime cost for patients and health systems. Tobacco use remains a preventable contributor to poor health, and reducing smoking and e-cigarette use may play a role in slowing diabetes incidence if the study’s intergenerational signals translate to human populations.
Authorship, funding and next steps
Co-authors on the paper include Stephanie Aguiar, Truman Natividad, Daniel Davis and Carlos Diaz-Castillo, all affiliated with UC Santa Cruz. Funding for the work came from the National Institute of Environmental Health Sciences at the NIH, the University of California Tobacco-related Disease Research Program and UC Santa Cruz start-up funds. The authors call for additional studies to determine mechanisms and to test whether similar patterns appear in human cohorts.
The study adds to a growing literature on how parental exposures prior to conception can affect offspring health, but it does not by itself establish direct causation in people. Translating findings from mouse models to human populations will require epidemiological studies and mechanistic work to identify the molecular pathways involved. In the meantime, clinicians and public health officials may take these results into account when advising prospective fathers about smoking and nicotine use.
