didn't actually eat any more than I would have done when at home, but I felt the need to eat earlier, and not get hungry. Getting hungry means getting cold and weak, weak means having trouble generating heat, which means even colder. I enjoy both biking and skiing when it's cold, but I find I have to be more careful about eating protein and fat-rich food in advance, I have to stay "stoked up" on food, and I have to avoid sweating a lot, either by moving a bit slower or by removing excess clothing early enough. None of these things matter much when it's above freezing.
Most definitely, when I stop to drink or eat something small ...or go to the washroom in the great outdoors while snowshoeing in the mountain wilderness, I do want to make any rest stop briefer than I would in warmer seasons: it's just colder!! I feel my vulnerability and need to be vigilant to keep moving, when it's quite cold in the winter. For certain at -20 degrees C in winter, I have to dress more warmly than you lph!