Spot on, we are the heart attack capital of Europe for a reason.
Couple of points... fast food isn't particularly cheap, you could get good produce out of the local butcher for less in most cases. However, I think the main reason many people have a lot of fast food is simply because of the time issue. I know that in my case, I was getting KFC/McDonalds/local chippie at least every second night for long periods throughout the school year, due to the fact that both my parents would be working.
I'm also not sure that a bad diet = obesity. I was always skinny, although I had notoriously generally crappy health. I'm not the only person I've known like this either, in fact probably most people who ate a lot of junk food never really got obese. My brother got pretty fat though, so I'm not even sure how much genetics has got to do with it.
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