Undernutrition Linked to Faster Cognitive Decline in Older Adults
Based on: Undernutrition impacts on cognitive performance trajectories in older adults: The collaborative PROMED-COG pooled cohorts study.
Older Italians who were undernourished at the start of the study were much more likely to fall into the steepest cognitive decline group over nine years. About 27% of fast decliners were undernourished, versus 12% of those who stayed sharp. The link was strongest for visible signs like low body weight or muscle loss. Cause and effect run both ways here, since cognitive decline can also reduce eating.
Key Insight
This study suggests checking nutritional status in older adults may help flag those at risk of faster cognitive decline.
Original Paper
Ravelli A, Prinelli F, Noale M, Conti S, Devita M, Ceolin C, Brennan L, de Groot LCPGM, McEvoy CT, Maggi S, Sergi G, Trevisan C
Conflict of Interest Disclosure: Authors declare no competing financial interests or personal relationships.
Related Studies
Blood NAD+ Levels Stay Flat With Age, Challenging Popular Aging Theory
One of the most repeated ideas in longevity is that NAD+ declines as we age, a story that helped make NR and NMN household names in the space. This large, carefully controlled study takes a closer look. Across seven independent cohorts and more than 300 people, researchers found that whole-blood NAD+ levels stayed remarkably stable with age, and didn't shift meaningfully in response to exercise, protein-rich diets, or multimodal lifestyle interventions in older adults. Importantly, NR supplementation did raise blood NAD+ as expected, confirming that the supplements work pharmacologically, the question is just whether blood NAD+ is the right thing to be measuring in the first place.
Better Diet Linked to Slower Epigenetic Aging, But Exercise Steals the Show
In two large U.S. studies of older adults, eating a higher-quality diet was tied to slower epigenetic aging and lower death risk. About 44% of the diet-mortality link was explained by GrimAge, a biological aging clock. But when researchers accounted for physical activity, the diet effect mostly disappeared. Movement may matter as much as the menu.
Healthy Lifestyle Didn't Change Brain Scans, But Still Helped At-Risk Seniors
In older adults at risk for cognitive decline, a two-year program of exercise, better diet, and social engagement didn't visibly change brain biomarkers like amyloid or shrinkage. But people who started with smaller hippocampi (the brain's memory hub) got more cognitive benefit from the structured version. So the lifestyle changes may help thinking even without obviously reshaping the brain.
Disclaimer: Research summaries are provided for informational purposes only and do not constitute medical advice. Always consult a qualified healthcare professional before making changes to your health routine.