Rising rates of early-onset cancer among adults under 50 in England, the US, and the Netherlands have prompted researchers to investigate multi-generational shifts in diet, lifestyle, and environmental exposures, according to a report by the World Cancer Research Fund.
Global Health Gains Stall as Early-Onset Cancer Rates Rise
For decades, public health metrics tracked longer lives, lower child mortality, and the near elimination of vaccine-preventable diseases. That trajectory shifted around the turn of the century. Data from 12 cancer types over the past 20 years show that certain malignancies are increasing in adults under 50. While better diagnostic tools explain some of the rise, researchers point out that younger generations face a higher incidence of specific cancers than previous generations did at the same age. In England, women under 50 have seen increases in stomach, pancreatic, liver, kidney, uterine, bowel, and breast cancers, while men under 50 saw increases in prostate, pancreatic, liver, kidney, and bowel cancers.
England Leads Fast-Rising Bowel Cancer Numbers While Studies Expand
Bowel cancer has traditionally affected older populations, with more than 9 in 10 cases occurring in people over 50. However, Cancer Research UK notes that UK-wide incidence rates for 25 to 49-year-olds have climbed by more than 50% since the early 1990s. Between 2007 and 2017, England experienced the fourth-fastest rise in early-onset bowel cancer among 50 countries analyzed, faster than any other country in Europe. In 2024, PROSPECT researchers found rising early-onset bowel cancer rates in 27 of those 50 countries. To investigate these trends, the PROSPECT-UK study, funded through Cancer Grand Challenges, aims to recruit 250,000 people aged 18 to 50. Lead researcher Professor Sarah Berry from King’s College London stated that researchers urgently need large-scale data to determine which environmental and lifestyle changes drive the risk. Over just a few generations, our lifestyles, diets and environments have changed dramatically,
Berry said.
Multi-Country Data Shows Increases Across Six Major Cancer Types
An analysis of data from 42 countries by researcher Amy Berrington de Gonzalez, cited by Deutsche Welle, identified rising rates of six specific cancers—thyroid, breast, colorectal, kidney, uterine cancer, and leukemia—among individuals aged 20 to 49 between 2003 and 2017. Colorectal cancer emerged as a distinct anomaly, rising among younger adults while simultaneously declining among older people in roughly one-third of the studied countries. In England specifically, annual colorectal cancer diagnoses for people under 50 shifted from approximately one in every 26,000 individuals in 2001 to one in every 12,000 in 2023.
Dietary Shifts, Sedentary Habits, and Environmental Toxins Under Investigation
Scientists investigating the generational uptick point to broad environmental changes since the 1950s. Global adult obesity rates have more than doubled, and adolescent rates have quadrupled since 1990. Data from 2024 shows that roughly 66% of adults in England are overweight or living with obesity. The WHO’s International Agency for Research on Cancer notes obesity is a risk factor for at least 13 cancer types. A 2021 review found young adults with obesity were nearly twice as likely to develop colorectal cancer before age 50. Epidemiologist Mark Gunter suggests reducing processed meat, eating more fiber, increasing physical activity, and maintaining a healthy weight to lower risk. Beyond diet and lack of physical activity, researchers are examining sustained exposure to environmental pollutants, plastics, and chemicals that became widespread over the past fifty years.
Common Questions Regarding Early-Onset Cancer Trends
Does a higher body mass index increase breast cancer risk for all ages equally?
Studies indicate that for women before menopause, a higher BMI is linked to a slightly lower risk of cancer.
What proportion of cancers are driven by individually modifiable behaviors?
Scientists estimate that only 40% of cancers at a population level result from “individually modifiable” behavior, such as weight, physical activity, diet, alcohol consumption, or smoking.
Why do researchers need a 250,000-person cohort for the PROSPECT-UK study?
Because early-onset bowel cancer remains relatively rare, researchers require very large observational groups to isolate significant patterns and trends regarding diet, lifestyle, and environmental contributions.
Did all cancer categories increase among younger populations over the last two decades?
A US study on pancreatic cancer in people aged 15–39 found the increase was almost entirely due to early-stage tumors, with mortality remaining unchanged. However, some US studies showed colorectal cancer increasing at later stages, suggesting more than just better detection.
Patient Perspective
Researchers emphasize that these findings should not lead to patient blame. One of the first human impulses after a diagnosis is to ask “what caused this?” or “what have I done?”, which is not helpful.