Dietary Patterns and Cardiovascular Risk in Adult Survivors of Childhood Cancer: Findings From the SCCSS-Nutrition Study

For decades, the medical community has celebrated the success of treating childhood cancer. More children than ever before survive their diagnosis, growing into adulthood with their lives ahead of them. Yet, this victory comes with a hidden cost. The very treatments that save young lives—powerful drugs and radiation—can damage the heart and blood vessels, leaving survivors at a higher risk for heart disease much earlier than the general population. Because the heart is so sensitive to these injuries, doctors have long suspected that what survivors eat as adults might help protect them or, conversely, hasten their decline. The question is not just about whether a single food is good or bad, but about the overall pattern of eating: the combination of foods a person chooses day after day, and how those choices interact with their history of illness.

Researchers in Switzerland set out to understand this relationship by looking at the eating habits of nearly 800 adult survivors of childhood cancer. They wanted to see if these survivors had developed unique ways of eating because of their past illness, and whether those specific ways of eating were linked to heart problems. Instead of counting individual nutrients like vitamins or fats, the team looked at the whole picture of what people put on their plates. They asked participants to recall everything they ate over a month, grouping these items into broader categories like fruits, processed meats, or sugary snacks. By analyzing these groups together, they could see the "recipes" of daily life that emerged naturally from the data, rather than forcing people into pre-defined categories.

The study revealed that these survivors did not eat in a single, uniform way. Instead, the researchers identified five distinct dietary patterns that the group followed. The first was a "Mediterranean-inspired" approach, rich in fish, fresh fruits, and vegetables, with very little processed meat or alcohol. This group made up about 22 percent of the participants. At the other end of the spectrum were two "Western" styles. One, called the "Western indulgence" diet, was dominated by fast food, processed meats, and alcohol, and was the most common pattern, followed by 38 percent of the survivors. Another group, representing 26 percent, followed a "Western sweet and fatty" pattern, characterized by high-fat dairy, sugary treats, and refined grains. Two smaller groups emerged as well: a "restrained indulgence" group that ate processed meats and sweets but avoided alcohol and fast food, and a "plant-based and alcohol-rich" group that ate plenty of vegetables and fruit but also consumed significant amounts of alcohol.

Who followed which pattern turned out to be deeply connected to who the person was, rather than just their medical history. The researchers found that men were far more likely to follow the Western indulgence diet, while women were more likely to choose the Mediterranean or plant-based options. Age played a role too; younger survivors were more likely to follow the Western or plant-based patterns, while older survivors tended toward the Mediterranean style. Where a person lived within Switzerland mattered as well, with those in German-speaking regions more likely to eat Western-style foods compared to those in French or Italian-speaking areas. Education and income also shaped these choices. Higher education and living in wealthier neighborhoods were linked to both the healthy plant-based diet and the indulgent Western diet, suggesting that money and status did not simply lead to healthier eating, but rather to more varied and complex eating habits. Surprisingly, having children was linked to a lower likelihood of following the alcohol-rich plant-based diet, likely because parenting responsibilities limit time for social drinking.

Despite these clear differences in how people ate, the study found no link between these dietary patterns and the actual heart health of the survivors. The researchers checked whether those eating the "unhealthy" Western diets were more likely to have high blood pressure, diabetes, high cholesterol, or diagnosed heart disease. They found no such connection. The prevalence of heart disease and risk factors was roughly the same across all five groups. This lack of association does not mean that diet is unimportant, but rather that the story is more complex. The average age of the survivors in this study was 35 years old. Heart disease often takes decades to develop, and the damage from childhood cancer treatments may not show up as a full-blown heart attack or stroke until much later in life. It is also possible that some survivors, once they learned they had heart risks, changed their diets to become healthier, which would blur the lines between their past habits and their current health status.

The study concludes that while the eating habits of childhood cancer survivors are clearly shaped by their gender, age, education, and where they live, these habits do not yet show a clear connection to heart disease in this relatively young group. The findings suggest that we cannot yet say that a specific diet is causing heart problems in these survivors, simply because the clock has not run out long enough for those problems to appear. However, the researchers emphasize that diet remains a critical tool for the future. Because these survivors are at higher risk for heart issues than the general population, maintaining a healthy diet is still a vital part of their long-term care. The goal now is to continue watching these survivors as they age, to see if the dietary patterns they follow today will eventually protect them or put them at risk tomorrow. Until then, the focus remains on understanding the social and personal factors that drive what these survivors eat, so that support can be tailored to help them make the best choices for a long and healthy life.