Lifestyle and the aging brain: interactive effects of modifiable lifestyle behaviors and cognitive ability in men from midlife to old age

We examined the influence of lifestyle on brain aging after nearly 30 years, and tested the hypothesis that young adult general cognitive ability (GCA) would moderate these effects. In the community-dwelling Vietnam Era Twin Study of Aging (VETSA), 431 largely non-Hispanic white men completed a test of GCA at mean age 20. We created a modifiable lifestyle behavior composite from data collected at mean age 40. During VETSA, MRI-based measures at mean age 68 included predicted brain age difference (PBAD), Alzheimer's disease (AD) brain signature, and abnormal white matter scores. There were significant main effects of young adult GCA and lifestyle on PBAD and the AD signature (ps ≤ 0.012), and a GCA-by-lifestyle interaction on both (ps ≤ 0.006). Regardless of GCA level, having more favorable lifestyle behaviors predicted less advanced brain age and less AD-like brain aging. Unfavorable lifestyles predicted advanced brain aging in those with lower age 20 GCA, but did not affect brain aging in those with higher age 20 GCA. Targeting early lifestyle modification may promote dementia risk reduction, especially among lower reserve individuals.

Colorectal Cancer-Related Knowledge, Acculturation, and Healthy Lifestyle Behaviors Among Low-Income Vietnamese Americans in the Greater Philadelphia Metropolitan Area

Colorectal cancer (CRC) is the second and fourth most common cancer in Vietnamese American women and men, respectively. Recent research has highlighted the importance of modifiable lifestyle behaviors such as smoking, alcohol use, dietary behaviors, and physical activities in CRC prevention for the general population. However, it is not well understood how well Vietnamese Americans knew about CRC prevention and risk factors, and whether there were any disparities in knowledge within this vulnerable population. This study examined whether comprehensive measures of acculturation and knowledge of CRC risk are associated with different health behaviors, specifically physical activity, protective dietary behaviors, and risky dietary behaviors in Vietnamese Americans. We recruited 374 Vietnamese Americans aged 50 or above from community-based organizations in the Vietnamese American communities in the greater Philadelphia metropolitan area. Through a cross-sectional survey, we collected data on their knowledge of CRC prevention and risk factors, acculturation-related factors, and sociodemographic characteristics. We found limited knowledge of CRC prevention and risk factors, and suboptimal physical activity and healthy dietary behaviors in the Vietnamese Americans. We also found that higher levels of knowledge about CRC and risk factors were associated with less unhealthy diets but not with more protective diets or physical activity. Acculturation was not significantly associated with overall dietary behaviors in our study. Our findings addressed gaps in current literature concerning the impact of knowledge about CRC risk factors and acculturation on different dimensions of dietary behaviors as well as physical activity. Research and practical implications were discussed.