For the second time in a week, research has been released focusing on dad’s health as a contributing factor to pregnancy success, and we love it. When people talk about preparing for pregnancy, the advice usually falls on moms. Eat better. Take your vitamins. Cut back on caffeine. Book the appointment. Make lifestyle changes. Fathers are often treated as a supporting character in a story framed almost entirely around the mother’s health. But a new study published in *Human Reproduction* is a reminder that this view can be too narrow. The researchers found that eating more highly processed foods during conception was associated with different concerns for women and men. In females, it was associated with slightly shorter early embryo development and smaller yolk sac size. In men, it was associated with reduced fertility and a higher risk of infertility.
This finding seems particularly important because highly processed foods are not an unusual part of modern life. They are often the most convenient foods at home. Packaged snacks, frozen meals, sugary cereals, processed meats, soft drinks and foods that fit busy family schedules. According to the additional text provided with the study, these foods now account for 50 to 60 percent of daily food intake in some high-income countries.
That’s part of what makes this research land. This is not a specialized obsession with health or an unrealistic standard of “perfect” nutrition. It’s about the foods many people rely on when life is hectic, money is tight, and time is short. For couples trying to conceive, this makes the study feel less abstract and more like a reflection of real life.
Researchers looked at 831 female and 651 male partners enrolled in a long-term prospective study in the Netherlands. They assessed the parents’ diets during early pregnancy, around 12 weeks, and calculated how much of each person’s total intake came from highly processed foods. The average intake of ultra-processed food was 22 percent for women and 25 percent for men. They also collected information on time to pregnancy, fertility, which is the chance of conceiving within a month, and infertility, defined as taking 12 months or more to conceive or using assisted reproductive technology.
In addition, the researchers used transvaginal ultrasound to measure crown-tip length, which is a standard way of monitoring fetal size and growth, along with yolk volume at seven, nine and 11 weeks’ gestation.
The findings were not the same for women and men. In women, higher intake of ultra-processed foods was not consistently associated with gestational age or infertility, but was associated with slightly shorter fetal growth and smaller yolk sac size by the seventh week of pregnancy. The study authors said these differences were small but still important from a research and population health perspective.
This may sound very technical, but these early readings are important because they can provide clues about how the pregnancy is progressing in its early stages. The publication notes that impaired first-trimester fetal growth has previously been associated with preterm birth, low birth weight, and an adverse cardiovascular profile in childhood. He also notes that impaired yolk sac development has been associated with an increased risk of miscarriage and preterm birth.
This is not to say that a few convenience meals will cause harm or that a person’s diet determines the outcome. It means researchers are paying attention to early developmental markers because they may help explain how health before and around conception shapes what happens next.
For men, the findings pointed in a different direction. Higher intake of highly processed food was associated with higher risk of infertility and longer time to pregnancy. The researchers suggested that sperm may be particularly sensitive to nutritional composition, which could explain why paternal nutrition appeared more strongly in fertility outcomes than in fetal development itself.
This point is important, and frankly, overdue. Discussions about fertility and pregnancy still tend to put the blame almost entirely on women. This study brings this idea back to life. The authors said their findings highlight the need to pay more attention to men’s health in the preconception period, which has traditionally been ignored, and move away from the assumption that only maternal health and lifestyle matters for pregnancy and offspring outcomes.
This also fits with another study we covered last week, more broadly on men’s health before pregnancy. In this review, researchers argued that fathers’ preconception health can influence pregnancy outcomes, child development, and family well-being, and that healthy family building should not fall solely on mothers. Growing evidence suggests that fathers’ mental health, age, substance use and overall well-being also matter. Overall, the message is becoming harder to ignore: pre-pregnancy health is not just a woman’s business.
This change matters because it changes the tone of the conversation. Instead of treating pregnancy preparation as a list given to women, she reframes it as something shared. This does not erase the reality of pregnancy occurring in a person’s body, but recognizes that the path to pregnancy and the health of a future child are affected by both parents.
At the same time, some perspective is needed here. The study on highly processed foods was observational, meaning it found associations, not proof of cause and effect. The authors were clear about this. They said the research cannot prove direct causes of ultra-processed food intake on fertility or early fetal development, and more work is needed to replicate the findings in more diverse populations and better understand the biology behind them.
They also raised an important question: what exactly is driving the link? Is the lower nutritional quality of many highly processed foods? Is it additive exposure? Could exposures related to packaging, such as microplastics, also play a role? At this stage, the study cannot answer this.
This nuance matters, especially in parenting and fertility coverage, where it’s easy for complex research to flatten into scary advice. Most families are already under enough pressure. No one needs another title that turns every snack into a moral failure. The most useful takeaway is not perfection. It is awareness.
This study shows that the eating patterns that both partners bring to the period before conception may matter more than people once thought. It’s yet another reminder that reproductive health begins before pregnancy, and that the conversation needs to include fathers in a much more serious way than it often does now.
It’s also a reminder of how difficult healthy choices can be in everyday life. Highly processed foods became common for reasons that are easy to understand. They are cheap, fast, familiar and convenient. For many families, they are part of the way of survival. So this is not a blame story. It’s a story about recognizing that the environment people live in doesn’t always make simple healthy choices, even when those choices may matter.
