We're always being warned off some sort of food. This is bad for you and so is that. Don't even think about the other!
There's always some sort of nasty chemical or ingredient that is had for you: artificial colours, flavourings and hydrogenated fats for a start.
So what has this got to do with websites? Well for a start if you use a ready-built script off the shelf, there could be stuff lurking about in it that you do not know about. Read the rest of this article and comment on it over at David Fiske.com. Remember, I don't use nofollow so you can benefit by commenting on my blog.