Reducing calories may promote healthy brain aging

There are several things you can do to promote healthy aging. According to new research, one of them may be passing up dessert.

A long-running study of rhesus monkeys has found that eating fewer calories over many years could help protect the brain from age-related decline — and potentially reduce risks linked to diseases like Alzheimer’s.

Researchers at Boston University examined the brains of 24 monkeys that had followed either a typical diet or one restricted by 30% for more than two decades. Their goal was to see whether a lighter caloric load could influence how the brain’s cells age.

Stronger cellular protection

The team focused on myelin, the fatty, protective coating that wraps around nerve fibers. Myelin acts like insulation on electrical wiring, helping signals travel quickly and efficiently. But as we age, myelin naturally degrades — a process tied to inflammation and cognitive decline.

Compared with animals on standard diets, the calorie-restricted monkeys showed:

• More active myelin-related genes
• Better functioning metabolic pathways responsible for producing and maintaining myelin
• Healthier performance of the specialized cells that build and repair myelin

Together, these signs point to more resilient nerve communication, suggesting the restricted diet helped preserve crucial brain functions.

“These cellular alterations could have implications that are relevant to cognition and learning,” said Boston University neurobiologist Tara Moore.

Why fewer calories might mean a healthier brain

Decades of research suggest that calorie restriction can shift the body into a more efficient metabolic state, reducing cellular stress and slowing biological aging. This new study offers rare, long-term evidence that the same protective effects may extend to the brain in primates — organisms far closer to humans than the rodents typically used in longevity research.

“This study provides rare, long-term evidence that calorie restriction may also protect against brain aging in more complex species,” explained lead author Ana Vitantonio.

Myelin breakdown has increasingly been recognized as a contributor to neurodegenerative diseases, including Alzheimer’s and Parkinson’s. When myelin weakens, nerve cells can misfire or trigger damaging inflammation — a known feature of age-related cognitive decline.

By showing that calorie restriction helps preserve myelin and the cells that maintain it, the study adds another piece to the puzzle of how diet may influence long-term brain health.

What this means for seniors

The findings don’t prove that calorie restriction will prevent dementia in humans, nor do they suggest that people should immediately cut their daily intake by 30%. Long-term restrictive dieting can carry risks, and what works in monkeys doesn’t always translate directly to people.

But the research does strengthen a growing body of evidence that how much we eat may be as important as what we eat when it comes to healthy aging. Scientists say future studies in humans are needed, but the work points to diet as a potentially powerful, non-pharmaceutical tool for supporting brain health over a lifetime.