An Australian study has found that selenium—a mineral found in many foods—could be the key to a healthier mind, as experiments show that it can reverse the decline in brain function from poor health or old age. Selenium is a powerful antioxidant found in meat, tuna, halibut, sardines, salmon, organ meat, eggs, and nuts, with the highest levels found in Brazil nuts. Researchers from the Queensland Brain Institute (QBI) discovered that physical exercise activates the mineral’s benefits, as increased activity facilitates a protein key to transporting selenium into our blood. Lead researcher Tara Walker said this is the reason why exercise creates new neurons in the brain, boosting learning and memory. “We’ve known for the last 20 years that exercise can create new neurons in the brain, but we didn’t really understand how,” Walker said. The scientists sought to help people with low mobility also obtain the same benefits of …