Why can cancer return even after healthy eating and exercise?

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Cancer can return even with healthy eating, exercise, and a calm mindset
Cancer can still return after treatment even when someone eats well, exercises, and keeps a steady mindset, because the threat of recurrence remains and it is not fully preventable by lifestyle alone. The columnist notes that for some people it comes back “no matter how clean they eat,” and that stressing or worrying will not change that outcome. Follow-up appointments are described as an ongoing reality, even when scans come back clear “for now.”
Recurrence risk can persist despite clear scans
Even after treatment and periods of remission, the possibility of cancer returning can remain. The account describes routine follow-ups, including scans that have “come back clear” and imaging such as mammograms and ultrasounds, yet still frames recurrence as a threat that “looms always.” This reflects the reality that “clear” results at a given time do not eliminate the longer-term possibility of recurrence.
Cancer may involve cells that remain after treatment
Cancer recurrence can happen when tiny cancer cells persist in the body after treatment and later grow again. Medical understanding of recurrence commonly involves the idea that not all cancer cells are necessarily removed at once, meaning there can be residual microscopic cells that are not detected immediately. This helps explain why a person can do everything that supports overall health and still face the possibility of return.
Tumour biology can vary, affecting how it responds
Tumours can be biologically diverse, meaning different cancer cell populations may respond differently to treatment. Industry-wide medical consensus generally treats recurrence as influenced by tumour characteristics and the biology of how cancer behaves over time, not only by daily habits. As a result, healthy eating and exercise are typically associated with lowering risk or improving general health, but they are not guarantees against recurrence.
Stress is not treated as a single cause of recurrence
The columnist explicitly says stressing or worrying “will not serve me” and will not be useful in preventing return. In broader medical framing, stress and anxiety are often discussed as factors that can affect wellbeing, but they are usually not viewed as a single, direct cause that determines whether cancer comes back. Overall, recurrence is treated as a multifactor issue, and lifestyle and mindset do not provide certainty either way.

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Why can cancer return even after healthy eating and exercise?

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