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Aim To explore the experience of dealing with defecation dysfunction by changing the eating behaviours of people with rectal cancer following sphincter‐saving surgery. Design The descriptive qualitative design was applied. Methods Individual semi‐structured interviews were conducted with 36 purposively selected rectal cancer survivors who had experienced sphincter‐saving surgery. All interviews were recorded and transcribed verbatim. The thematic analysis was used to structure the data analysis. Results Three major themes, namely “have motivations to change diet”; “need strategies to change diet” and “face barriers to change diet” were generated along with 12 subthemes. Overall, needing to change one's dietary behaviour is the most important theme in addressing defecation dysfunction in patients following sphincter‐saving surgery. Future studies need to focus more on the specific relationship between different food types and the degree of defecation dysfunction. Systematic, scientific and continuous instructions on eating behaviour are in great need for patients after sphincter‐saving surgery.