A new study from the University of Copenhagen shows that ultraprocessed foods, such as protein drinks, frozen pizzas, and sugary sodas, may significantly reduce sperm quality and hormonal health in men, even when consumed in moderate amounts.
Ultraprocessed Diets Linked to Lower Fertility in Men
Men who regularly consume ultraprocessed foods could be putting their reproductive health at risk. A recent clinical study from the University of Copenhagen found that consuming foods made with industrial processing methods can negatively impact key fertility markers in young men.
The research, conducted at the university’s Novo Nordisk Foundation Center for Basic Metabolic Research, explored the effects of ultraprocessed food consumption over a short-term period. Healthy men aged 20 to 35 participated in a controlled trial where researchers observed their physical and hormonal responses to two drastically different diets.
Three-Week Diet Trial Measures Impact
The men in the study were first placed on an ultraprocessed food diet for three weeks, consuming items commonly found in Western diets such as frozen pizzas, sugary sodas, toast bread, and protein shakes. Afterward, they were switched to a minimally processed diet, mostly whole foods like fruits, vegetables, fresh meat, and grains, for another three weeks.
One of the most striking findings was that participants gained an average of 2.2 pounds (1 kilogram) during the ultraprocessed food phase. More notably, their testosterone levels and another key reproductive hormone decreased, potentially contributing to reduced fertility.
Reduced Sperm Mobility
The study also highlighted a 13 percent decline in sperm motility, the ability of sperm to swim toward an egg, which is essential for successful fertilization. Reduced motility significantly lowers the chance of natural conception and can be an early warning sign of impaired sperm health.
What Are Ultraprocessed Foods?
Ultraprocessed foods are not simply foods that contain additives, but rather products made using industrial formulas with multiple synthetic ingredients. These foods typically go through extensive chemical and mechanical processing not replicable in a home kitchen. Manufacturers often produce them to enhance flavor, extend shelf life, or reduce production costs.
According to the NOVA food classification system used by nutrition researchers, food can be grouped into four categories:
– Unprocessed or minimally processed foods: Fresh vegetables, fruits, and raw meats
– Processed culinary ingredients: Sugar, oils, butter
– Processed foods: Canned vegetables, cheese, fresh bread
– Ultraprocessed foods: Packaged snacks, microwave meals, soft drinks, and sweetened breakfast cereals
It’s Not Just the Calories
Interestingly, the two diets in the study were identical in terms of caloric content and macronutrient balance, calories, proteins, carbohydrates, and fats were all kept constant. Nevertheless, the negative changes seen in the ultraprocessed group suggest that the issue lies not with caloric or nutritional balance, but with the processing methods used to manufacture the foods.
Researchers speculate that certain synthetic additives or hormone-disrupting chemicals, often present in packaging materials or produced during processing, may be responsible for the biological disruption observed.
Increased Hormone-Disrupting Substances in Body
Another concerning finding from the study was a noticeable rise in the levels of hormone-disrupting substances in the participants’ bodies. One such compound is commonly found in plastics and is known to interfere with the endocrine system, which regulates hormones critical for reproduction and metabolism.
This finding suggests that exposure to industrial chemicals through diet may contribute to systemic changes in human biology, raising concerns about long-term health consequences.
Call for Updated Nutritional Guidelines
The scientists behind the study emphasized the need to reevaluate current dietary guidelines. With the popularity and availability of ultraprocessed foods continuing to grow worldwide, there is a pressing need to consider how such foods impact more than just caloric intake.
The researchers believe that national nutrition recommendations should reflect these findings and encourage reduced consumption of ultraprocessed items, especially among younger populations planning to start families.
Looking Ahead
While more extensive studies are necessary to pinpoint which specific ingredients or production processes drive these health effects, the early data points to significant risks. With just three weeks of ultraprocessed eating causing measurable declines in reproductive markers among healthy men, the study raises red flags about the long-term impacts of modern processed diets.
For men concerned about fertility or overall hormonal health, switching to a diet based on whole and minimally processed foods may offer a practical and effective way to protect their well-being.
