A surprising dementia study suggests the same nitrate may help or harm the brain depending on whether it comes from spinach, meat, or even your drinking water. Credit: Shutterstock New research from Edith Cowan University (ECU) and the Danish Cancer Research Institute (DCRI) suggests that the source of nitrate in a person's diet may play an important role in dementia risk. In a large study that followed more than 54,000 Danish adults for up to 27 years, researchers examined how nitrate and