"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:
"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
Your best interest may differ from doctors best interest when treating you (not getting sued, following guidelines, getting paid for not rocking the boat)
So document yourself: medline is free, and with sci-hub, you can get the full versions of anything
EDIT: actually, no, don't document yourself. Ignorance is bliss. Why would I even care? After all, it's your life! And I care even less than your doctor, since we don't even have a contractual relationship (which you have with your doctor by virtue of paying him).