Do people change their eating habits after a diagnosis of cancer? A systematic review

Background People who live with and beyond cancer are considered to be motivated to change their diet. However, there is a lack of reviews conducted on what specific dietary changes people make and further evaluation may inform future interventional studies. Hence, we aim to summarise the evidence on dietary changes in observational studies before and after a cancer diagnosis. Methods This systematic review followed the guidelines of Preferred Reporting Items for Systematic Reviews and Meta‐Analysis. Electronic searches were conducted in four databases to identify cohort and cross‐sectional studies on dietary changes before and after a cancer diagnosis, excluding studies that evaluated an intervention. Quality assessment was undertaken, and meta‐analyses were conducted where suitable. Results We identified 14 studies with 16,443 participants diagnosed with cancer, with age range 18–75 years. Dietary change was assessed