New research highlights obesity as a contributing factor to increasing cancer risk among those under 50
Category: Health
Cases of bowel and ovarian cancer are on the rise among young adults in the UK, a concerning trend that has researchers and health officials alarmed. According to a study published in the *British Medical Journal Oncology* on April 28, 2026, this increase is particularly notable among individuals under 50 years old. The research indicates that obesity is a key factor contributing to this rise, but it does not fully explain the trends observed.
The study analyzed cancer incidence trends in England from 2001 to 2019, utilizing data from the National Disease Registry Service. This comprehensive database captures nearly every cancer diagnosis in England, allowing researchers to track trends reliably across the population. The analysis focused on more than 20 different cancer types, comparing patterns between two age groups: those aged 20-49 and those aged 50 and older. It was led by Professor Montserrat Garcia-Closas, MD, DrPH, from The Institute of Cancer Research, London.
The research revealed a startling increase in 11 types of cancer among younger adults, including bowel and ovarian cancers. Other cancers experiencing a rise included thyroid, multiple myeloma, liver, kidney, gallbladder, pancreatic, womb lining (endometrial), mouth, and breast cancers. Notably, these cancers also saw increased rates among older adults, with bowel and ovarian cancers being the exceptions. Professor Garcia-Closas noted, "Of the 11 cancers we identified which were increasing and linked to known lifestyle factors—the most common by far in younger adults was breast cancer." This increase in cancer cases was correlated with various behavioral risks, primarily obesity, which was linked to most of these cancers.
In fact, the study found that established behavioral risk factors accounted for a substantial share of cancer cases. For example, in 2019, these factors contributed to 49% to 53% of bowel cancers among younger adults. Other factors included smoking, alcohol intake, physical inactivity, and dietary habits. The research highlighted that obesity rates continue to be a major concern, with excess weight being the most common risk factor associated with cancer.
This rising incidence of certain cancers among those under 50 is not isolated to the UK; it reflects a broader trend observed in other countries as well. The findings suggest that, in addition to shared risk factors across age groups, some cancers may have age-specific exposures or susceptibilities. Professor Garcia-Closas emphasized the need for effective public health policies to combat the obesity epidemic. “Prevention takes a long time and we must act now with what we know, with more effective public health policy and programs to address the overweight and obesity epidemic,” she stated.
The study also noted that trends in behavioral risk factors among younger adults have remained stable or improved over the past one to two decades. For example, the average daily intake of red meat fell significantly, from 38 grams in 2008 to 17 grams in 2018 among younger men, and from 22 grams to 10 grams in younger women. Yet, over 90% of younger adults were not consuming enough fiber in 2018, highlighting a gap in healthy dietary habits that could contribute to cancer risk.
Though the findings are concerning, the study does have limitations. The data analyzed was based on cancer diagnoses reported to the National Disease Registry Service, and the trends observed may not capture all nuances of cancer development. The reliance on self-reported data for risk factors such as diet and physical activity could also introduce bias. The study does not imply causation but rather highlights correlations that warrant more in-depth investigation.
Moving forward, researchers are calling for more targeted studies to explore the specific reasons behind the increasing rates of these cancers among younger populations. Future research may focus on identifying additional risk factors, improving screening practices, and developing effective interventions to reduce obesity and its associated health risks. As Professor Garcia-Closas pointed out, addressing these issues now is imperative to reverse the rising trend of cancer incidence among young adults.