A major scientific review involving more than 17 million people has found that higher dietary fibre intake is associated with a lower risk of several chronic diseases and a lower risk of dying from cardiovascular disease.
Published in Clinical Nutrition in 2025, the study examined the relationship between dietary fibre consumption and 38 different health outcomes. Its scale makes it one of the most comprehensive assessments of fibre and human health published to date.
What did the researchers examine?
Rather than analysing one clinical trial or population, the authors brought together findings from 33 existing meta-analyses large studies that had already combined evidence from numerous individual investigations.
In total, the review covered 33 meta-analyses, 38 health outcomes, and 17,155,277 people.
What did the study find?
Of the 38 health outcomes examined, 29 showed a statistically significant association between higher fibre intake and lower disease risk.
The most convincing evidence linked higher dietary fibre intake with a lower risk of:
The researchers also found highly suggestive evidence of associations with a lower risk of:
Suggestive evidence was identified for another 16 health outcomes, while six outcomes were supported by weaker evidence.
In other words, the evidence was not equally strong for every disease. But across most of the health outcomes examined, the overall direction was remarkably consistent: people who consumed more fibre generally experienced lower rates of chronic disease and premature death.
Fibre and cardiovascular health
The clearest finding concerned cardiovascular disease mortality the risk of dying from diseases of the heart and blood vessels.
Dietary fibre may support cardiovascular and metabolic health through several different mechanisms. Depending on the type of fibre, these may include:
-
helping to maintain healthy cholesterol levels;
-
slowing the absorption of carbohydrates;
-
moderating post-meal blood glucose responses;
-
supporting insulin sensitivity;
-
contributing to fullness and appetite regulation; and
-
influencing the gut microbiome and its metabolic by-products.
The study also found highly suggestive evidence linking greater fibre intake with lower overall rates of cardiovascular disease and coronary heart disease.
Fibre and diverticular disease
The review found similarly convincing evidence for a lower risk of diverticular disease.
Diverticula are small pouches that can form in the wall of the large intestine. When they cause symptoms or become inflamed, they can lead to pain and other digestive complications.
Fibre can support normal bowel function by increasing stool bulk, holding water and helping material move through the digestive tract. However, different fibres behave differently. Some primarily add bulk, some form viscous gels, and others are readily fermented by intestinal bacteria.
What did the research find about cancer?
The review found convincing evidence of an association between higher fibre intake and a lower risk of pancreatic cancer. It also found highly suggestive evidence of a lower risk of ovarian cancer.
These findings do not mean that dietary fibre can prevent or treat cancer. They show that, across the populations included in the research, people with higher fibre intakes were less likely to develop certain cancers.
Further research is needed to understand the biological mechanisms involved and determine whether particular fibre types or food sources are responsible for the associations.
Not all fibre is the same
One of the most important questions raised by the review is whether different types of fibre produce different health effects.
Dietary fibre is not a single nutrient performing one function. It includes many structurally different carbohydrates that resist digestion in the small intestine.
Individual fibres vary in their:
A viscous soluble fibre behaves differently from an insoluble cereal fibre. A fermentable resistant starch may affect the gut differently from a fibre that primarily increases stool bulk. Some fibres demonstrate substantiated prebiotic effects, while others do not.
The researchers specifically called for more investigation into the roles of individual fibre types in disease prevention.
How strong is the evidence?
This was an exceptionally large review, but size alone does not make every finding conclusive.
Only six of the included meta-analyses were assessed as being of high methodological quality. The remaining analyses had some limitations, and the credibility of the evidence varied between health outcomes.
Much of the underlying research was also observational. It can show that higher fibre consumption is associated with better health outcomes, but it cannot prove that fibre alone caused them.
People with fibre-rich diets may also eat more vegetables, legumes, whole grains, nuts and fruit. They may exercise more, smoke less or differ in other ways that contribute to their long-term health.
Even after allowing for these limitations, the strongest associations—particularly those involving cardiovascular mortality, pancreatic cancer and diverticular disease—met the researchers’ criteria for convincing evidence.
The bigger picture
The study provides substantial evidence that dietary fibre deserves to be considered a central part of long-term health not simply something taken for bowel regularity.
Across more than 17 million people, higher fibre intake was associated with lower risks across most of the health outcomes examined. The strongest evidence concerned cardiovascular mortality, pancreatic cancer and diverticular disease, with further evidence supporting associations with longevity and cardiovascular health.
Yet fibre consumption remains below recommended levels around the world.
The researchers’ conclusion was straightforward: public-health strategies should encourage greater consumption of fibre-rich foods, while future research should look more closely at how specific fibre types affect different aspects of health.
You can read the full study abstract in Clinical Nutrition.
This article does not in any way convey nor suggest that fibre supplements, including the fibre product here, is in any way linked to any specific disease prevention, and most importantly, does not in any way suggest cancer prevention. However, we do believe that fibre research, diverse fibre diets and the scientific studies of these are important knowledge.
Study: 17 million people, fibre and long-term health
A major scientific review involving more than 17 million people has found that higher dietary fibre intake is associated with a lower risk of several chronic diseases and a lower risk of dying from cardiovascular disease.
Published in Clinical Nutrition in 2025, the study examined the relationship between dietary fibre consumption and 38 different health outcomes. Its scale makes it one of the most comprehensive assessments of fibre and human health published to date.
What did the researchers examine?
Rather than analysing one clinical trial or population, the authors brought together findings from 33 existing meta-analyses large studies that had already combined evidence from numerous individual investigations.
In total, the review covered 33 meta-analyses, 38 health outcomes, and 17,155,277 people.
What did the study find?
Of the 38 health outcomes examined, 29 showed a statistically significant association between higher fibre intake and lower disease risk.
The most convincing evidence linked higher dietary fibre intake with a lower risk of:
death from cardiovascular disease;
pancreatic cancer; and
diverticular disease.
The researchers also found highly suggestive evidence of associations with a lower risk of:
death from any cause;
cardiovascular disease;
coronary heart disease; and
ovarian cancer.
Suggestive evidence was identified for another 16 health outcomes, while six outcomes were supported by weaker evidence.
In other words, the evidence was not equally strong for every disease. But across most of the health outcomes examined, the overall direction was remarkably consistent: people who consumed more fibre generally experienced lower rates of chronic disease and premature death.
Fibre and cardiovascular health
The clearest finding concerned cardiovascular disease mortality the risk of dying from diseases of the heart and blood vessels.
Dietary fibre may support cardiovascular and metabolic health through several different mechanisms. Depending on the type of fibre, these may include:
helping to maintain healthy cholesterol levels;
slowing the absorption of carbohydrates;
moderating post-meal blood glucose responses;
supporting insulin sensitivity;
contributing to fullness and appetite regulation; and
influencing the gut microbiome and its metabolic by-products.
The study also found highly suggestive evidence linking greater fibre intake with lower overall rates of cardiovascular disease and coronary heart disease.
Fibre and diverticular disease
The review found similarly convincing evidence for a lower risk of diverticular disease.
Diverticula are small pouches that can form in the wall of the large intestine. When they cause symptoms or become inflamed, they can lead to pain and other digestive complications.
Fibre can support normal bowel function by increasing stool bulk, holding water and helping material move through the digestive tract. However, different fibres behave differently. Some primarily add bulk, some form viscous gels, and others are readily fermented by intestinal bacteria.
What did the research find about cancer?
The review found convincing evidence of an association between higher fibre intake and a lower risk of pancreatic cancer. It also found highly suggestive evidence of a lower risk of ovarian cancer.
These findings do not mean that dietary fibre can prevent or treat cancer. They show that, across the populations included in the research, people with higher fibre intakes were less likely to develop certain cancers.
Further research is needed to understand the biological mechanisms involved and determine whether particular fibre types or food sources are responsible for the associations.
Not all fibre is the same
One of the most important questions raised by the review is whether different types of fibre produce different health effects.
Dietary fibre is not a single nutrient performing one function. It includes many structurally different carbohydrates that resist digestion in the small intestine.
Individual fibres vary in their:
solubility;
viscosity;
fermentability;
bulking capacity;
resistance to digestion; and
effects on the gut microbiome.
A viscous soluble fibre behaves differently from an insoluble cereal fibre. A fermentable resistant starch may affect the gut differently from a fibre that primarily increases stool bulk. Some fibres demonstrate substantiated prebiotic effects, while others do not.
The researchers specifically called for more investigation into the roles of individual fibre types in disease prevention.
How strong is the evidence?
This was an exceptionally large review, but size alone does not make every finding conclusive.
Only six of the included meta-analyses were assessed as being of high methodological quality. The remaining analyses had some limitations, and the credibility of the evidence varied between health outcomes.
Much of the underlying research was also observational. It can show that higher fibre consumption is associated with better health outcomes, but it cannot prove that fibre alone caused them.
People with fibre-rich diets may also eat more vegetables, legumes, whole grains, nuts and fruit. They may exercise more, smoke less or differ in other ways that contribute to their long-term health.
Even after allowing for these limitations, the strongest associations—particularly those involving cardiovascular mortality, pancreatic cancer and diverticular disease—met the researchers’ criteria for convincing evidence.
The bigger picture
The study provides substantial evidence that dietary fibre deserves to be considered a central part of long-term health not simply something taken for bowel regularity.
Across more than 17 million people, higher fibre intake was associated with lower risks across most of the health outcomes examined. The strongest evidence concerned cardiovascular mortality, pancreatic cancer and diverticular disease, with further evidence supporting associations with longevity and cardiovascular health.
Yet fibre consumption remains below recommended levels around the world.
The researchers’ conclusion was straightforward: public-health strategies should encourage greater consumption of fibre-rich foods, while future research should look more closely at how specific fibre types affect different aspects of health.
You can read the full study abstract in Clinical Nutrition.
This article does not in any way convey nor suggest that fibre supplements, including the fibre product here, is in any way linked to any specific disease prevention, and most importantly, does not in any way suggest cancer prevention. However, we do believe that fibre research, diverse fibre diets and the scientific studies of these are important knowledge.