It does make a certain amount of sense, though. The food of some fast food chains in particular has been proven to be addictive, which is why it's recommended that you don't take children there on a regular basis as they will most likely end up eating there frequently as an adult. (cf. Fast Food Nation by Eric Schlosser, amongst others. They're full of additives and chemicals which wouldn't be present if you made similar food at home. Most of them are injected with artificial flavours which mask the rubbish which goes into them.)
I certainly know that I've been eating too much rubbish (and have been feeling guilty about it). Hopefully this will serve as a wake-up call for me to make sure that I have some food in my bag on the way home so that I'm not tempted just to buy some chips when I get my hunger pangs.