Home > Newsletters > Daily: Love or hate Earth Hour? > Daily Dose: Rare flesh-eating bacteria kill boy within days > Health-in-Motion Updated 14 April 2016 Exercise your brain As with friendship, neglect and complacency can truly “undo” your brain. Your actual nerves, or grey matter, are mostly determined by your genes at birth. But your white matter – the insulating “telephone wire” that helps transmit information – continues growing until you’re about 45 or 50. What separates people with minds as nimble as kittens from those who process thought like lumbering old Labradors, is the amount of exercise they give their brains. Reading a book every week is the brain’s equivalent of a brisk daily walk 0 More: Daily Dose: Rare flesh-eating bacteria kill boy within daysHealth-in-Motion advertisement Other news Sex These 2 factors make the biggest difference in your sexual satisfaction Diet and nutrition SEE: Cut back on salt, or else... Lifestyle Surgery for early prostate cancer might not save your life Medical Can carrots really make you see in the dark? Lifestyle Your pee can reveal your true age News 6 of the biggest health lies told by celebs From our sponsors Managing diabetes in the workplace Back-to-school with diabetes Live healthier Effects on your brain? » 5 ways to get more seafood into your diet Mercury in fish may raise ALS risk Is it bad for your brain if you literally never eat fish? Calling all grown-ass picky eaters! Eeewwww! » ‘Why is my cough worse at night?’ SEE: When you cough, this is what happens to your body Can you get sick if someone coughs on you? The fine saliva mist emitted by a cough remains suspended in the air for up to 10 minutes.