The body runs best on food..things like Vitamin Pills and just plain water often quit much earlier than a good solid meal.. What happens inside the nose is that its connected to the lungs.. The feeling that[loss]of body heat will congest the nose is true but having a proper diet fights the loss of heat from with-in the lungs..aiding the nose in clearing its habitual irritants and "snoot".. Once the abdomen has gone empty the body begins to lose..water won't really help.. Hot drinks containing chocolate-sugar..Hot Soups..Bacon and Eggs.. Sugar..Protein..HOT..is best I have found.