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While a shocking number of women prefer to bed down with a dad bod, experts say the physique could be bad news for future fathers.
New research published in Current Obesity Reports explores how a man’s overall health before and during parenthood plays a critical role in childhood development.
“We found that fathers’ health is an important contributor to children’s health through biological, behavioral, and environmental pathways,” said corresponding author Matthew Landry.
While maternal health has long been linked to childhood obesity, Landry and his team set out to better understand how the condition is shaped by the role of the father.
“Obesity is not simply the result of individual choices,” said Landry. “This work highlights that obesity risk is 40 to 70 percent heritable and can be passed across generations through complex biological and environmental influences.”
In 2023, the CDC estimated that 40% of Americans had a body mass index (BMI) of 30 or higher — the threshold for obesity. Current projections maintain that by 2030, 250 million children will be classified as obese.
Obesity comes with a hefty list of health risks, including an increased risk of diabetes, heart disease, stroke, and certain cancers.
Researchers noted that a dad with a thicker physique could adversely affect the metabolic health of children in three key ways.
First, obesity alters the epigenetic signature of sperm. These biological signals help regulate gene function in early development and can affect appetite regulation, metabolism and long-term disease risk in children.
Essentially, obesity can negatively affect children from the moment of conception onward.
In terms of behavior modeling, a father’s diet, parenting practices and physical activity levels directly influence the eating and exercise habits of their children.
This is of significance as fatherhood often coincides with a period of weight gain and decreased physical activity, suggesting that children are more likely to be exposed to unhealthy patterns.
According to researchers, socioeconomic factors such as income, food insecurity, neighborhood conditions, workplace policies and paternal mental health “create shared family-level exposures that simultaneously influence paternal physiology, parenting behaviors, and childhood adversity, compounding obesity risk across generations.”
Grim as these findings may be, researchers maintain there is hope, as many of these effects are reversible.
Sperm health can be improved through lifestyle changes and weight-loss interventions, including bariatric surgery and medications like Ozempic.
Behaviorally speaking, paternal participation in meal preparation, sharing family meals, and prioritizing physical activity with and for their children have all been linked to improved health outcomes for offspring.
Regarding socioeconomic factors, the study authors note that public health programs targeting obesity prevention and father-inclusive prenatal care, as well as corporate policies that include paid parental leave and other forms of flexibility, could dramatically improve overall well-being for both dads and kids.
“Fathers have historically been overlooked in maternal and child health research and intervention efforts,” said Landry. “Recognizing fathers as active contributors to family health creates new opportunities to improve outcomes for future generations.”
A glut of previous research has established that maternal behavior is a strong predictor of childhood obesity.
A 2019 study found that children of mothers who were obese while pregnant had a 264% increased likelihood of developing obesity themselves.
Research suggests that a mother’s health and lifestyle choices — such as poor nutrition during pregnancy, gestational diabetes, formula feeding, early introduction of solid foods, a sedentary lifestyle, poor sleep patterns, and high stress levels — can significantly increase her child’s risk of obesity
