when you are busy, it is easy to run through the fast food joint and get dinner much harder to go home and prepare a dull healthy meal.

Yep - and most of us (I believe) aren't good at planning for this occasion, which tends to happen far too often - so why aren't we better at planning for it? Then, there is also (in Finland) a lack of healthy "fast" foods available. If business profits were tied to health of society, would we have as much trash?