Sadly, you are somewhat misinformed in this respect.
Zapping can be very beneficial to anyone who is dealing with a persistent microbial infection or any microbial infection that may be life threatening.
There are some limitations, especially in the older single and dual frequency zappers that you may have used. There are more advance products available today that do work far better for those who are intelligent enough and open minded enough to try.
I do agree that proper nutrition and wholesome food is extremely important. I Raise my own chickens and ducks and grow food in my own garden.
I also do not rely on milk for my calcium or anything else for that matter. I do love real cow butter compared to margarine and love yogurt.