There are certain foods that slow down blood flow too, namely those high in tyramine. Unfortunately, many of these foods are popular, especially in the après setting, among them: alcohol (especially red wine), chocolate, caffeine, aged cheese (clinically referred to as “the cheese effect”), fermented sausage, salt, and excessive saturated fat (fried foods). Avoiding these foods and beverages during a ski trip (good luck) has the potential to stave off cold hands and feet.
From a metabolic standpoint, there are, again, gobs of factors that can cause poor circulation, but two common ones are thyroid function and Raynaud's Disease. The thyroid gland controls metabolism, and many folks (especially women) who experience chronic cold hands and feet should have their thyroid function checked. In Raynaud’s disease, smaller arteries that supply blood to the skin narrow, limiting blood circulation to affected areas, turning the tips of fingers white and causing them to go numb.