Forty-five percent of dementia cases are potentially preventable, and simple lifestyle choices including exercise, diet and social connection all contribute to your risk score. But what if these risk factors were leaving chemical warning signs of decline in your brain—long before any symptoms of dementia played out? Researchers believe they've found just that. The study used magnetic resonance imaging and MR-spectroscopy to measure the brain chemical levels of 79 healthy older adults. All participants had normal memory, thinking skills and cognitive function. What varied was their modifiable-dementia risk score—calculated from health and lifestyle factors such as physical activity, sleep, social...