Selenium—a mineral found in many foods—could reverse the cognitive impact of stroke and boost learning and memory in aging brains, according to University of Queensland research. Queensland Brain Institute (QBI) lead researcher Dr. Tara Walker said studies on the impact of exercise on the aging brain found levels of a protein key to transporting selenium in the blood were elevated by physical activity. "We've known for the last 20 years that exercise can create new neurons in the brain, but we didn't really understand how," Dr. Walker said. The research team investigated whether dietary selenium supplements could replicate the effects...