The car windows freeze over and ice crystals decorate the trees. The kale season in Northern Germany begins always after the first frost has come. But why is that so? Though chefs from Northern Germany know, that kale simply tastes better then, there has been no scientific answer to this question, yet. However, Professor Nikolai Kuhnert of Jacobs University Bremen and Professor Dirk Albach of the University of Oldenburg, have now found an answer to this question together with their working groups. The findings were published in the journal “Food Research International”.