[coldtea]

>There is no local produce in winter

Depends on the country -- and region of the country. There are countries that sport different climates and micro-climates. And there is stuff that thrives during the winter as well. And if it's really needed, we've had greenhouses for ages.

But that's part of the proposition: don't eat out of season stuff, even if it means changing the diet in an annual cycle (which, e.g. tons of Italians has no problem doing -- even if it means no, of much fewer tomatoes in winter).