Consuming soybean oil is associated with a 49 percent increased risk of developing bladder cancer, according to research published in the peer-reviewed scientific journal Nutrients.
Scientists reached the conclusion after carrying out an extensive analysis of data gathered from more than half a million people across multiple long-term health investigations. Over the course of the monitoring period, 3,164 participants out of the total sample were diagnosed with bladder cancer.
The statistical synthesis combined the findings of 12 separate cohort studies involving a total of 549,000 individuals. After adjusting the data to account for other potential confounding factors, the researchers determined that participants who consumed soybean oil had a risk of developing bladder cancer that was approximately 49 percent higher than those who did not consume the product.
This heightened risk was observed among individuals with both moderate and high levels of soybean oil consumption, indicating that even regular, non-excessive intake of the oil was linked to elevated disease rates in the analyzed population.
Gender differences and whole soy products
The study highlighted significant variations in risk when the data was evaluated based on the sex of the participants. Among men, the consumption of soybean oil was linked to an increased risk of bladder cancer. Conversely, among women, moderate consumption of whole soybeans was associated with a reduced risk of developing the illness.
The researchers stressed that this elevated cancer risk was specific to soybean oil and was not found across soy products in general. Consuming whole soybeans, soy milk, and unfermented soy paste was not tied to any increased risk of cancer within the overall study cohort.
Soybeans and soy-derived foods are widely consumed globally. Whole soybeans, soy milk, and unfermented soy paste contain plant proteins, dietary fiber, and natural compounds, whereas extracted soybean oil consists primarily of refined fats separated during industrial processing.
Observational studies and nutritional research
Soybean oil is one of the most widely produced and consumed vegetable oils in the world, frequently utilized in processed foods, salad dressings, commercial baking, and deep frying. Bladder cancer is a form of cancer that originates in the urothelial cells lining the urinary bladder, the organ that stores urine before it is excreted from the body.
A cohort study is an observational research design in which scientists track a designated group of people over time to evaluate how specific exposures, such as dietary choices, correlate with disease incidence. By pooling data from 12 distinct cohort studies, researchers aim to identify broader statistical patterns across large populations.
The study authors emphasized that their findings demonstrate a statistical association rather than proving that soybean oil directly causes bladder cancer. Observational studies identify correlations within population data but cannot establish a direct cause and effect relationship without further scientific testing.
Future research and related dietary studies
The authors noted that the precise biological causes and mechanisms behind the observed link between soybean oil intake and bladder cancer risk remain to be established in future investigations.
The publication adds to ongoing scientific research examining how various dietary fats and cooking oils impact human health. In earlier research, scientists discovered that coconut oil may help protect the brain from physiological changes associated with stress.
