Why is it unneccesary to heat fruits and nuts?

Meat, vegetables, grain, fish, what else is left?

Is it because they have outer layer? What prevents infection to being in the seeds? Is it a chance we have to take? Is manual wahing reliable? Is there a soap for fruits like berry?

I heard heating reduces chances for infection but makes it harder for stomach to digest...is there something that can be mixed? how about or own spit?(chewing very slowly) What else?
 
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