Discovery means people can be treated years before showing symptoms . Tests showed toxic protein which clogs brain started growing at age 20 . Comment: This explains why Alzheimer 's can advance so quickly , said experts .
Discovery means people can be treated years before showing symptoms . Tests showed toxic protein which clogs brain started growing at age 20 . As clumps of protein build up , cells surrounding the memory weaken . This explains why Alzheimer 's can advance so quickly , said experts .