A Father's Nicotine Use Can Unknowingly Affect his Children's Metabolism and Diabetes Risk

New research findings published in the Journal of the Endocrine Society suggest that a father’s exposure to nicotine may influence how his offspring process sugar. In a study of mice, scientists found that the father’s nicotine intake led to metabolic changes in the next generation. These changes can affect how the body processes glucose and could increase the risk of developing diabetes. The study also notes that tobacco use remains one of the leading preventable causes of health problems. Reducing behaviors such as smoking and the use of e-cigarettes could help curb the growing diabetes epidemic. This could be particularly significant for men, who use tobacco products more frequently than women.

Researchers Identify Metabolic Changes in Offspring

Diabetes is a widespread health problem. According to the U.S. Centers for Disease Control and Prevention (CDC), an estimated 40.1 million Americans live with the disease. In Europe, about 60 to 66 million people are affected, which is roughly one in every 10 adults. People with diabetes have an increased risk of developing complications such as heart disease, kidney disease, and nerve damage. Because so many people are affected by diabetes and it is a lifelong condition, treatment and management impose a significant financial burden.

“When male mice ingested nicotine via their drinking water, their offspring exhibited metabolic changes that appear to influence the way the body metabolizes sugar,” said the study’s lead author, Dr. Raquel Chamorro-Garcia of the University of California, Santa Cruz, in Santa Cruz, California. “This suggests that tobacco use in males is associated with an increased risk that their offspring will develop diabetes.” To investigate this link, the researchers tracked the offspring of male mice that had been given nicotine in their drinking water. These offspring were compared with those in a control group whose fathers had not been exposed to nicotine.

The results showed clear metabolic differences between the groups. Female offspring of nicotine-exposed fathers had lower insulin levels and lower fasting blood glucose levels compared to the control group. Male offspring also showed reduced blood glucose levels and changes in liver function. Conditions such as obesity and diabetes are known to be contributing factors to metabolically-induced steatotic liver disease.

The Importance of Male Health Before Conception

“Given the evidence that a man’s exposure can increase the likelihood that his children will develop chronic diseases, it is crucial to include men’s health in preconception care,” said Chamorro-Garcia, an assistant professor of microbiology and environmental toxicology at UC Santa Cruz. “Our findings suggest that a father’s use of tobacco products can have lasting effects on his children’s health.” Since the mice were exposed exclusively to pure nicotine during the experiment, the researchers were able to study its effects in isolation. According to Chamorro-Garcia, the results suggest that the metabolic changes observed in the offspring were not caused by other byproducts found in cigarettes or additives used in e-cigarettes.

Increased tobacco use in men may raise the risk that their offspring will develop diabetes mellitus because nicotine causes biological changes in sperm. These are not classic genetic mutations, but rather so-called epigenetic changes. This means that genes responsible for regulating sugar and fat metabolism can be controlled differently without the actual DNA sequence changing. This altered “programming” is passed on to the offspring.

As a result, altered metabolic regulation can occur as early as the development of the embryo. Organs such as the pancreas or the liver, which play a central role in glucose metabolism, may develop slightly differently. This can lead to altered insulin production or action in the offspring, which in the long term increases the risk of metabolic disorders such as obesity and diabetes.

In addition, nicotine can trigger oxidative stress and hormonal changes in the father’s body, which also affect the quality and function of sperm. Oxidative stress creates an imbalance between harmful molecules (free radicals) and the body’s own defense systems. Nicotine promotes the formation of these free radicals, which then attack cells—including developing sperm in the testicles. The consequences can include:

• Damage to sperm DNA
• reduced motility (important for fertilization)
• altered “programming” of genes

Such damage can later affect embryo development and thus indirectly increase the risk of diseases such as diabetes mellitus. Since these effects are directly attributable to nicotine itself, the results show that it is not only other harmful substances in tobacco smoke, but nicotine alone, that is sufficient to contribute to such long-term effects on the health of the next generation.

Measures Men Can take to Reduce the Diabetes Risk in Their Offspring

Men can actively take steps to lower the risk of metabolic diseases such as diabetes mellitus in their future children—especially before conception. A key point is avoiding tobacco and nicotine. Since nicotine can epigenetically alter sperm, it is worth quitting smoking several months before a planned pregnancy. Sperm take about 70–90 days to regenerate—during this time, quality can improve significantly. Equally important is a healthy lifestyle overall. This includes a balanced diet rich in vegetables, whole grains, and healthy fats, as being overweight and obesity can also affect sperm quality and the metabolism of future children. Regular exercise also helps keep blood sugar stable and reduce the risk of future health issues.

Reducing alcohol consumption and getting enough sleep are also important, as both influence hormonal processes and fertility. Chronic stress should also be avoided as much as possible, as it can negatively affect hormonal balance and thus sperm quality. Furthermore, it may be advisable to undergo preventive screenings—especially if risk factors for diabetes mellitus are already present. Early treatment or lifestyle changes can not only improve one’s own health but also have long-term effects on the next generation.