If your brain could write you a grocery list, what do you think would be on it? Probably not the cereal or pastry you grabbed this morning. (Sorry.) Your brain is only 2% of your body weight but it's the most demanding organ you have, and every meal is either giving it what it needs to stay sharp or quietly letting it down. The good news? Researchers have identified 10 ordinary foods, all available at your local grocery store, that contain compounds proven to protect th