The document outlines 5 biohacks for the holiday season: 1) Get vitamin D through sunlight, supplements, or foods like fish; 2) Start the day with good fats like butter, bacon, and nuts; 3) Snack on chocolate for its antioxidants, iron, magnesium and dopamine; 4) Use spices like vanilla, ginger, cayenne pepper and cinnamon for their anti-inflammatory and mental boosting properties; 5) Catch up on sleep which improves mood and recovery. A hangover hack of taking charcoal is also suggested.