The differences are really interesting. The Japanese family has lots of prepackaged ingredients, the Scicillians have lots of fresh vegs, and the Mexican family drinks a lake of Coca Cola. Families who live more cheaply use lots of (starch-right) flour, such as the Bhutanese family. The German family manages to spend EUR 375 on food per week -- judging from the photo, most of that is used to purchase various bottled drinks.
Perhaps these photos are meant to show how good 'the West' has it in comparison with the rest of the world -- in Darfur, a whole family has to survive on USD 1.23 per week. But that is only part of the story. Prices are not the same in the world -- just look at the price variation in a Big Mac around the world.
It would be much more interesting to compare the caloric values of all the food -- and to divide that per person. Or to compare the relative part of the weekly income spent on food.
We spend between EUR 75 and EUR 100 per week on groceries -- not all of that is food. I don't know what that tells you, but there you have it. :)