The first thing you need to realize while heading into the winters, is that during the winters it takes longer for the food to pass your system, which means that most of your food gets absorbed into the body. That being said, you should decide if you want to gain or lose weight. If you are looking to gain weight then you should follow a very strict diet plan, however, if you are looking to lose weight, then you should follow the same weight loss plan you have during the summers.
Despite it being winters, you need to realize that your body is going to need protein. Now the only way you can get the very best protein in your body, is if you go on and eat a lot of meat. Eating meat is essential in all weather conditions, however, eating it in the winters will not cause it to be as big of a problem as it might have been, when you were looking to eat it in the summers, mainly because of the climatic change.
Now you are going to want to have a constant supply of energy, this will come from eating carbohydrates and complex sugars. Now for the carbohydrates, you can go on and turn to the likes of pasta, pizza, noodles, rice, bread and anything else which is high in carbohydrate content.
Sugars can be found in just about anything sweet and should be taken to give you some of that instant energy that you are looking for.
Also consider eating spicy food, since they speed up the whole digestive process and will make your food go out of your body much faster.