Diet as an Adjunct Therapy in Reducing Chemotherapy Toxicities and Improving Patients Quality of Life: A Systematic Review and Meta-Analysis

Abstract

This review analyzed existing literature regarding the relationship between different diets and chemotherapy toxicities, as well as the quality of life (QOL) among patients undergoing treatment. It aims to identify the most advantageous diet for cancer patients. PubMed, CINAHL, and Embase were used to select randomized control trials (RCTs) assessing the relationship between a specific diet and chemotherapy toxicities and/or QOL in patients as of October 2023. Out of 1,419 records, 11 RCTs were included. Analyses were stratified by diet type. Pooled odds ratios and 95% confidence intervals (CI) were obtained from the random-effect model using STATA. We included 7 studies testing fasting variations; 1 testing a ketogenic diet; 1 testing a Mediterranean diet; 1 testing a plant-based, high-protein diet; and 1 testing an anti-inflammatory diet. Four fasting studies were in the meta-analysis. The random-effects meta-analysis showed no significant difference in the incidence of chemotherapy toxicities between fasting and non-fasting patients. There is insufficient evidence to determine which dietary intervention is the most advantageous, however, there is evidence that all the diets examined may complement conventional cancer therapy by helping to reduce chemotherapy toxicities. No intervention can be ruled out. More research is needed in this field.