Scientists from Boston University have found that long-term, carefully controlled calorie restriction may slow brain aging at the cellular level. The findings were published in the journal Aging Cell.
This is not about severe fasting, but about a roughly 30% reduction in calorie intake — a level that can be safely sustained for years. The research followed participants for nearly their entire lifespans: it began in the 1980s in collaboration with the U.S. National Institute on Aging and concluded after their natural deaths, allowing scientists to examine their brains in detail.
To compare how the brain cells of people eating a typical diet differed from those who followed a long-term, lower-calorie diet, the scientists used one of the most precise modern techniques — single-nucleus RNA sequencing. The results were striking. The cells of those who practiced moderate calorie restriction showed more signs of healthy functioning: greater activation of genes responsible for myelin — the protective sheath around nerve fibers — as well as improved activity in metabolic pathways associated with energy balance and the maintenance of brain white-matter structure. In other words, these cells appeared younger and more resilient.
The researchers note that this suggests sustained, moderate calorie reduction may support brain health and slow age-related processes such as white-matter deterioration, myelin loss, and the weakening of neuronal connections. While not a miracle cure, it represents a gentle and natural approach to promoting healthier brain aging.
Although the study was carried out in human-like models and requires confirmation in larger human cohorts, the authors consider the findings an important advance. They suggest that diet may serve as a powerful means of preserving mental clarity and memory in later life.
