I've been snacking on sunflower seeds lately. They're fun to eat, not healthy at all, but tastey.
On the contrary, they're actually rather healthy. People just give foods which are high in fat a bad rap. It's the foods that are high in processed fat (and sugar) that you want to avoid.
So you're eating french fries?
Here's a handy conversion chart:
British ------
North AmericanChips ------- French Fries
Crisps ------ (Potato) Chips
The first is what you get at fast food places like McD's, the second from convenience stores like 7-11.