Gut Health and Brain Function in Older Adults

It turns out that what benefits your aging gut might also help your aging brain. A unique study focusing on twins found that daily intake of protein and prebiotic supplements could enhance memory performance in individuals over 60.

The research, published earlier this year, raises interesting points, especially since the cognitive tests used can detect early signs of Alzheimer’s disease.

This double-blind trial utilized inexpensive plant-based prebiotics readily available in many countries.

The prebiotics included inulin, a type of dietary fiber, and fructooligosaccharide (FOS), a plant carbohydrate often used as a low-calorie sweetener.

To gauge the impact of these supplements on cognitive function, researchers at King’s College London engaged 36 pairs of twins aged 60 and older.

One twin received a daily dose of prebiotic protein powder, while the other was given a placebo in a similar protein powder.

The results showed that the twin consuming inulin or FOS typically performed better on cognitive tests three months later.

Interestingly, daily fiber supplements were also associated with slight alterations in the gut microbiome among the twins. Those taking inulin or FOS had higher levels of the beneficial bacterium Bifidobacterium.

Research on mice hints that Bifidobacterium could mitigate cognitive issues by regulating connections between the gut and the brain.

“We are thrilled to observe these changes in just 12 weeks. This could greatly enhance brain health and memory for our aging population,” remarked a geriatric medicine researcher at King’s College when the results were revealed in March.

The study highlights the significance of the gut-brain axis and presents potential new strategies for healthier living as we age.

King’s College houses the UK’s largest adult twin registry, and such studies are crucial for understanding the roles of genetics and environment in health.

Previous animal studies suggest that high-fiber supplements, like inulin and FOS, may promote a healthy microbiome in the colon, allowing beneficial bacteria to flourish.

Moreover, some of these helpful bacteria have been linked to enhanced cognitive function in both animal and human studies.

The connection between gut health and cognitive abilities is strengthening, as research continues to reveal how our gut affects our brains.

However, while prebiotics appear to offer some cognitive benefits, significant physical improvements in muscle health were not observed among the aging twins taking these supplements.

“These affordable and easily available plant fibers could be advantageous for many, especially in these financially challenging times. They’re also safe to consume,” noted a geriatrician at King’s College.

The next phase of research will explore whether these cognitive effects can be maintained over longer periods and among larger populations.

Although the trial primarily involved female participants, the researchers adjusted for sex differences but acknowledged the potential for selection bias within the twin cohort.

Given that females are at a higher risk for Alzheimer’s, studies like this one lend credence to the idea that cognitive decline may not solely be a brain issue but could also involve external factors.

The gut plays a crucial role in various bodily systems, including immune and central nervous functions. Supporting its microbiome with specific prebiotics and probiotics may pave the way for treating numerous illnesses.

The findings were published in the journal Nature Communications.