There are plenty of studies to show how fasting lowers your immune response during a fast, but dramatically increases your immune response after completing a fast.
The standing CDC guidance is to wait to 2 weeks until you should consider yourself “vaccinated.”
Like the previous post, however, I have received all my COVID vaccinations, never stopped my IF protocols, and haven’t had COVID.
Fasting lowers your immune system (your body kills off old immune cells), and then refeeding refreshes it (your body makes new immune cells). Source: 2014 study by Valter Longo and colleagues (that’s a Forbes article about it, easier to read, but it links to the study itself). Actually, 72-hour fasts were exactly what they studied.
So I would not undertake a 3-day fast until a full two weeks after your COVID vaccination. Give your immune system time to build up immunity from the vaccine before you kill off existing immune cells.
Boosters have been given to probably millions of older adults who have compromised immune systems for any number of reasons. And they have been effective at preventing disease or significantly reducing illness severity in this population.
My guess is, if you are a healthy adult, fasting won’t have a significant affect on the immunity response. If you are worried about it, just wait until 14 days afterwards.
No scientific studies to cite here - just the advice I’d give to a patient.