Advice from the adults please :)

[SuzzPuss]

I don't think it's going to make you ill but it wouldn't taste very nice...  Unless you like raw potato of course.     If you want to fry potatoes from raw you're better off not using new potatoes which are a bit waxy.  Go for a white potato or a maris piper.  Mind you, I like new potatoes and they're really good for you so just par-boiling them first will sort it.

[suehugh]

Undercooked potatoes can be dangerous in the event that they remain too hard and lodge in your throat. This happened to me recently.
No problem as long as you have a friend who can perform the Heimlich manoeuvre.

[Lotty]

We used to eat raw potatoes when my mum was making chips, we loved them. There was a scare once when it was said that pregnant mothers shouldn't eat green potatoes because it could cause spina bifida in the new born. Not sure how true that is.