There is some new research info emanating from Stirling University that this is indeed the case after measuring the neural effect on players before and after heading a football. Heading practise is already banned in the USA for all young players up to the age of maturity. So it is an issue that has been taken seriously elsewhere. I notice Gary Lineker commenting that he avoided heading a football because he always felt there could be a poss bad effect on the brain in future years, referring to the premature death of WBA's old striker, Jeff Astle, as one prime example.