Affordable Plant Fiber Supplements Boost Memory in Older Adults

Breakthrough Twin Study Reveals Surprising Brain Benefits

A groundbreaking study involving twins has uncovered that taking daily protein and prebiotic supplements can improve memory test scores in people over age 60 . The research, conducted by scientists at King's College London, represents a first-of-its-kind study in twins that could reshape how we approach cognitive health in aging populations.

The study tested two inexpensive plant-fiber prebiotics that are available over the counter in many countries . One of the supplements was inulin, a dietary fiber in the fructan class. The other, fructooligosaccharide (FOS), is a plant carbohydrate often used as a natural low-calorie sweetener . What makes these findings particularly compelling is that the same visual memory and learning test is used to detect early signs of Alzheimer's disease .

The researchers enrolled 36 pairs of twins, all at least 60 years old , in a carefully controlled experiment. Each duo was randomly split so that one twin was assigned a daily prebiotic in a protein powder and the other was assigned a daily placebo in a protein powder . After three months, the twin who unknowingly took inulin or FOS generally scored higher on a cognitive test .

The Gut-Brain Connection Comes Into Focus

The study revealed fascinating changes happening beneath the surface. The daily fiber supplements were linked to subtle changes in the gut microbiome between twins. The beneficial Bifidobacterium, for instance, was more plentiful in those taking inulin or FOS . This bacterial shift appears crucial, as studies on mice suggest that Bifidobacterium reduces cognitive deficits by regulating gut-brain connections .

Evidence for the close relationship between the gut and the brain is growing year after year. Some experts are now so convinced by the results, they refer to the gut as the body's 'second brain' . However, the way these two nervous systems work together remains a mystery .

The speed of improvement surprised even the researchers. "We are excited to see these changes in just 12 weeks. This holds huge promise for enhancing brain health and memory in our aging population," said Mary Ni Lochlainn, a geriatric medicine researcher at King's College London . The cognitive improvements included better performance on tests assessing memory and thinking, including the Paired Associates Learning Test. This test is able to detect early signs of Alzheimer's disease. Those who received the prebiotic had half the number of errors on this test compared with the group that received a placebo .

Practical Benefits With Real-World Accessibility

One of the most encouraging aspects of this research is its accessibility. "These plant fibers, which are cheap and available over the counter, could benefit a wide group of people in these cash-strapped times. They are safe and acceptable too," said geriatrician Claire Steves at KCL . The research team estimates the cost of taking this kind of supplement at 15p a day .

While the brain benefits were clear, the study showed mixed results for physical health. Prebiotics appeared to improve some aspects of cognitive function in an aging brain, like memory and processing times, the study didn't identify significant physical benefits. Muscle loss didn't improve among aging twins taking high-fiber supplements .

The study also demonstrated innovative research methods. Researchers monitored participants remotely via video calls, online questionnaires, and online tests of memory and thinking . This approach could make future research more accessible to older adults who might struggle with frequent hospital visits.

Looking Toward the Future

While these results are promising, researchers acknowledge important limitations. The twins that participated in the current trial were mostly female , though this may actually be relevant since females are more susceptible to Alzheimer's disease .

The research team isn't stopping here. "Our next task is to see whether these effects are sustained over longer periods and in larger groups of people" , the researchers noted. The potential implications extend far beyond individual supplements, as "unlocking the secrets of the gut-brain axis could offer new approaches for living more healthily for longer" .

This research suggests that maintaining cognitive health as we age might be simpler and more affordable than previously thought. The connection between gut health and brain function opens new avenues for preventing cognitive decline, offering hope for millions of aging adults worldwide who want to maintain their mental sharpness well into their golden years.