Another reason to get those daily vitamins: A study published in Neurology says that senior citizens who eat vitamin-rich foods (vitamins B, C, D, E and omega-3 fatty acids) have better cognitive skills and brain volume than those who don’t. The same study also reported decreased cognitive functioning and smaller brain volume in those who ate foods high in trans fat, like pizza and packaged dinners. So encourage your parents or grandparents to eat fresh fish, fruits and vegetables—all great vitamin sources! You can start now, too.