It never ceases to amaze me the way it's the done thing to bring over a cake, scones, or a tart when visiting. The host also feels obliged to have an unhealthy gift for the visitors too. In some cases neither of them may actually want to eat the food... they just take a few nibbles out of politeness when in each others' company, and then suggest the teenagers can eat it during the week. The food then remains in the house untouched for a day or two before finally being thrown out. Of course a lot of the time it gets eaten, and therefore it's no wonder we're such a fat country.