here is some ideas
first you will say that our eating habits changed in the last years
for example we dont find those traditional, plates like the past
for now we find a different way of live
people buy food now for example food in canes
restaurents food ect you can add another examples
and yes i think that advertising is one of the reasons that changed our habits
now people see products on tv they see advertisements in public places
so they discover new food and they buy it
cause the whole operation of advertising is based on the attract of customers
hope that i helped you and wish me luck please
if i remembered aby auther idea i will write it