Huntington's disease is a genetically inherited disease that was caused by a defect that will be inherited in autosomal dominant ways. That mean the children of the offspring to inherit the gene would be at least 50%. The symptoms would be personality disorder(mood swing, depression), decreased cognitive ability(forgetful), involuntary movement and unstable gait, slurred speech with difficulty in swallowing food.
In some scenarios protein can make your head and feet larger but that is certainly not what it's used for. protein in a natural supplement that the body needs to stay alive.