Vitamin B-12 enjoyed another shining moment in the spotlight when a small study published in the September issue of Neurology linked low blood levels of the vitamin to quicker loss of brain mass (and function) in older people. Many positive people already take B-12—in pills or shots—for extra energy and other benefits. For best results, get B-12 from meals as well as supplements. Add these foods rich in B-12 to your shopping list:

•    shellfish—especially clams, mussels, crabs and oysters
•    beef liver
•    fortified breakfast cereals
•    fish—especially trout, sockeye salmon, haddock, herring, sardines, mackerel and canned tuna
•    sirloin steak and hamburgers    
•    yogurt
•    soy-based meat substitutes