Unfortunately, not all physical ills can be remedied by external treatments. Don't just overindulge on fine foods and alcohol, instead reach for the citrus fruits, bananas and nuts which appear in abundance around the festive period.
Forgo your morning toast and instead throw a handful of sultanas into your porridge, along with cinnamon and ginger powder. These dietary additions are not only festive, but they'll help to keep your immune system on an even keel too.
It sounds obvious, but adequate hydration can go a long way to combating the external signs of Christmas overindulgence. The most important time to replenish your H2O reserves? Make sure that your last drink of the night isn't alcoholic, but rather pure water.