A recent study from the St. Jude Lifetime Cohort has offered new insight into an important question: could eating well help adult survivors of childhood cancer avoid premature ageing? As more children are surviving cancer, attention is shifting to the long-term health challenges this group faces—including a greater risk of developing age-related illnesses much earlier than expected.
What Did the Study Find?
Researchers discovered that adults who survived childhood cancer and followed a healthier diet, measured by tools such as the Healthy Eating Index and the Alternate Mediterranean Diet Score, were less likely to be in the high-risk category for premature ageing. Every 10-point increase in the Healthy Eating Index was linked to a 20% reduction in risk, while each point on the Mediterranean diet score led to a further 9% decrease.
Despite these positive findings, the reality is concerning: over 80% of survivors in the study did not adhere to healthy eating guidelines, compared to 63% of people in the wider community.
Why Is Eating Well So Difficult?
The authors suggest that dietary habits can be shaped early on, especially for children undergoing cancer treatment, who are often encouraged to eat whatever they fancy, leading to a preference for high-calorie, nutrient-poor foods. Later, the after-effects of treatment, such as fatigue and emotional stress, can make it much easier to opt for convenience food rather than preparing healthy meals.
Examining the Evidence
The study looked at data from over 3,000 adult survivors, assessing their diets, health status, and a wide range of factors that could influence ageing and wellbeing. While the association between a healthy diet and reduced risk of premature ageing is encouraging, some experts advise caution. Dr Jason Oke, from the University of Oxford, notes that the study is cross-sectional, meaning it cannot prove cause and effect. The observed changes are significant, but it is difficult to pinpoint exactly how much impact they have in practice.
Other researchers also pointed out that the link between diet and premature ageing weakened once factors like education and treatment history were taken into account. Although physical activity wasn’t included as a separate factor in the analysis, it was indirectly measured within the overall health assessment.
What’s Next for Survivors?
Despite these challenges, the main message is clear: more personalised support is needed to help survivors of childhood cancer make healthier dietary choices and age well. Generic advice is not enough. Tailored interventions, such as individual nutrition education, could make a real difference, helping people overcome barriers and find what works best for them at every stage of their recovery.
It is a timely reminder that surviving cancer is only the first step. Supporting survivors in the years that follow by addressing diet, activity, and other lifestyle factors could help them not only live longer, but also enjoy a better quality of life.
Manuela Boyle March 2026
