This study follows your line of thinking. (Ramadan Fasting and Patients with Cancer: State-of-the-Art and Future Prospects) https://www.ncbi.nlm.nih.gov/pmc/a

This study follows your line of thinking. (Ramadan Fasting and Patients with Cancer: State-of-the-Art and Future Prospects) https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4748028/ https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4748028/ Unfortunately this is in the abstract. "Our main findings are that (1) very few studies have been carried out, addressing this issue, (2) evidence concerning quality of life and compliance to treatment is contrasting and scarce, and (3) generally speaking, few patients ask their physicians whether they can safely fast or not. For these reasons, further research should be performed, given the relevance and importance of this topic."