| I notice the downvotes to my post, but what you was told is demonstrably wrong. As for how/why it works: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7069085/ "Fasting before or after wound injury accelerates wound healing through the activation of pro-angiogenic SMOC1 and SCG2" There are various other publications on autophagy (removing old stem cells and making new ones) For those who are going to say "in mice", the effects of true (water only) fasting has been replicated in humans, in well done trials, in even harsher conditions than surgery: chemotherapy. Fasting improves various things such as the severity of symptoms during chemo and the efficiency of the treatment: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5921787/ "Short term fasting during chemotherapy is well tolerated and appears to improve quality of life and fatigue during chemotherapy" It may be counter intuitive, but there's a large body of evidence that fasting promotes healing (check the various reference of this 2018 trial: "Fasting cycles retard growth of tumors and sensitize a range of cancer cell types to chemotherapy" https://pubmed.ncbi.nlm.nih.gov/22323820/ etc |