A very large and well designed study from Glasgow strongly supports an association in professional football players between heading the ball and, later in life, ‘neurodegenerative disease’ (dementia, Alzheimer’s disease, non-Alzheimer dementia, motor neuron disease, and Parkinson’s disease). Five percent of the former soccer players were identified with a neurodegenerative disease diagnosis compared with a neurodegenerative disease diagnosis compared with 1.6 percent of matched population control people. Risk of neurodegenerative disease was highest for defenders and lowest for goalkeepers. Defenders…..