Some one had the same question as you so here is someone answer.
A balanced diet, one that includes carbohydrates, proteins, and fats is necessary to slow down digestion. Each plays a different role when it comes to metabolism and energy use. Fats are necessary for the long runs as they are your primary fuel source when carbs run out , carbs are necessary for the medium length runs when your phosphocreatine runs out. Proteins are necessary for recovery. An Adequate ingestion of all the macros post workout, permits recovery for next day training. When it comes to digestion, a mixed meal including all macros slows down digestion and allows the absorption of all nutrients.
Head injury, as your head is your skull, damaging your skull is very serious as your brain is located there and damaging your brain could probably kill or limit some abilities
Yes, aging stops about 20 years of age.
