Does Reality TV show a reflection of real life?

I think shows like Big Brother do in some way show a reflection of real life, as there are camera's all over the big brother house which manage to glimpse and capture every moment of what the contestants get up to/ However, the contestants know that they are being watched which might make them alter their natural personas therefore showing a false identity. They might also change their images and personalities in order to get votes from audiences to win the cash prize. I think there's obviously two sides to this question and the answer is upto the audience who watch these programmes.

Here is a link which talks about big brothers past and present : http://www.channel4.com/bigbrother/