Researchers tie dietary fiber intake to successful aging


one more reason to eat your fiber

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A diet high in fiber helps to keep us regular. But now Australian researchers have uncovered a surprising benefit of this often-undervalued dietary component.

Eating the right amount of fiber from breads, cereals and fruits can help us avoid disease and disability into old age. Interested? You should be. 

The study, published in The Journals of Gerontology and called "Series A: Biological Sciences and Medical Sciences," was conducted by scientists from The Westmead Institute for Medical Research. Using data compiled from the Blue Mountains Eye Study, a benchmark population-based study that examined a cohort of more than 1,600 adults aged 50 years and older for long-term sensory loss risk factors and systemic diseases, the researchers explored the relationship between carbohydrate nutrition and healthy aging.

They found that out of all the factors they examined — which included a person's total carbohydrate intake, total fiber intake, glycemic index, glycemic load and sugar intake — it was the fiber that made the biggest difference to what the researchers termed "successful aging."

Successful aging was defined as including an absence of:

  • disability,
  • depressive symptoms,
  • cognitive impairment,
  • respiratory symptoms and
  • chronic diseases including cancer, coronary artery disease and stroke.

According to lead author of the paper, associate professor Bamini Gopinath, PhD, from the Institute's Centre for Vision Research, the study is the first to look at the relationship between carbohydrate intake and healthy aging, and the results were significant enough to warrant further investigation.

"Essentially, we found that those who had the highest intake of fiber or total fiber actually had an almost 80% greater likelihood of living a long and healthy life over a 10-year follow-up. That is, they were less likely to suffer from hypertension, diabetes, dementia, depression and functional disability."

While it might have been expected that the level of sugar intake would make the biggest impact on successful aging, Gopinath pointed out that the particular group they examined were older adults whose intake of carbonated and sugary drinks was quite low.

Although it is too early to use the study results as a basis for dietary advice, Gopinath said the research has opened up a new avenue for exploration.

"There are a lot of other large cohort studies that could pursue this further and see if they can find similar associations. And it would also be interesting to tease out the mechanisms that are actually linking these variables," she said.

This study backs up similar recent findings by the researchers, which highlight the importance of the overall diet and healthy aging.

In another study published last year in The Journals of Gerontology, Westmead Institute researchers found that, in general, adults who closely adhered to recommended national dietary guidelines reached old age with an absence of chronic diseases and disability, and had good functional and mental health status.

While scientists continue figuring out whether the key to having a better, healthier old age lies in the gut, you'll at least feel fuller for longer and, hopefully, keep yourself regular.