Well since it's instant, they use alot of salt and usually a high amount of MSG (Which is a flavour enhancer.) You shouldn't really eat that much, as the nutrients in it are extremely low, eating it...
the effects of junk food is to much fat can cause to heart disease or even worse to be strait. there are really no good effect of junk food. that's why they call it JUNK.but moderatian is the key :)
The good effect of preservation would be prolonging an items shelf life (extending the time before the item would spoil). The bad effect of preservation would be the potential harmful effects to your...