Personally I say good luck to them. It's their body, their choice. They're not hurting anyone and we only get one life and if that is what they choose to do with their body it's no one else's business.
I have learned the old adage 'never judge a book by it's cover' is very very true. Sometimes the nicest kindest looking people are absolute bastards or bitches and those people who look like they eat razor blades for breakfast and weight lift a buick every morning are actually very decent people.
I like people who are different, or look different and as far as I am concerned each to their own.