In the lat­est issue of Neu­rol­o­gy a study by Erick­son et al. (2010) sug­gests that walk­ing reg­u­lar­ly can increase brain vol­ume and reduce the risks of devel­op­ing cog­ni­tive impairment. The researchers stared with 2 mains facts: Gray mat­ter vol­ume shrinks with age, often lead­ing to cog­ni­tive decline. Phys­i­cal exer­cise seems to be neu­ro-pro­tec­tor (see our pre­vi­ous…