Since nearly half of all adults in the United States begin their day with a cup of coffee, a new study says that morning ritual can have the added protection off helping preserve your brain, and the darker the roast, the better, according to USA Today. Canadian researchers from the Krembil Brain Institute in Toronto conducted tests using Starbucks VIA Instant light, dark, and decaffeinated dark roasts to test for the presence of compounds known as phenylindanes. Scientists posited the