[Jonty30]

Vitamin deficiency and sticky foods can be wearing on the teeth over time.

[Vanders9]

Fast food isn't neccesarily "sticky", and it doesnt make any difference if you brush your teeth afterwards anyway. Nor, contrary to all the assertions of the health food lobbyists, is it particularly deficient in vitamins.

The main problem with fast food is that people eat too much of it, to the exclusion of anything else. But then if you eat too much of any food to the exclusion of anything else you'd be in trouble, even organic wheat grass soya lattes. :)