Regarding diet in the winters I consume two things more:
I drink too much coffee myself but if I were you I would consider drinking tea. If you can eat baked fish instead of fried. You would be surprised eating healthier can make you healthier
For baked fish I would have to put in oven my self but I do not know how to do it and that is why there is a shop near our home with a huge pan of oil so I tell that guy to fry fish for me.
I don't like the effect of tea as it has lower amount of caffeine also tea work only when it is really hot but my coffee I can take while it is mildly hot and not fully hot thats one of the reason I prefer coffee however it is quite expensive.