A daily B vitamin can halve the rate of brain shrinkage in older people, and could ward off dementia and Alzheimer's. The supplements - including folic acid, vitamin B6 and B12 - dramatically slowed brain shrinkage, or atrophy, in a trial involving 168 volunteers aged 70 years and older. As atrophy is common in people with Alzheimer's and dementia, the research team believes the supplements could also reduce the risk of developing cognitive problems. While it is a good idea for everyone to take the supplements, the researchers especially recommend the regime to older people, and for those who are beginning to suffer from slight memory loss. (Source: PLoS One, 2010; 5: e12244).