Oh, thank you very much for this detailed explanation, chrisb1! I am sorry for not being able to connect, read and answer until now.
I am in the 31st day of water fast. That question I formulated two days ago, crossed my mind while reading about those problems that some vaccines and their toxicity produce, especially in children and I started to think if, in older ages, when a person could decide what to do for his/her own health, their harmful effects could be eliminated by water fasting.