Elsevier

Nutrition

Volume 59, March 2019, Pages 158-169
Nutrition

Review article
Role of guar fiber in improving digestive health and function

https://doi.org/10.1016/j.nut.2018.07.109Get rights and content

Highlights

  • Digestive health is important for daily quality of life.

  • Guar fiber has dual action to reduce both constipation and diarrhea.

  • Guar fiber alleviated the conditions and symptoms associated with irritable bowel syndrome.

  • All the digestive health effects were observed with intake of about 5 to 6 g of guar fiber.

  • Guar fiber provided a natural remedy for maintaining proper digestive health.

  • Guar fiber offered potential prebiotic effects for protection of digestive health.

Abstract

Digestive health plays key role in our active daily life; but maintaining proper bowel movements, i.e., being free from constipation, diarrhea, irritable bowel syndrome, inflammatory bowel disease, flatulence, bloating, and abdominal pain, is complex. Dietary fibers often are recommended to maintain proper digestive health, but none seems to provide a single comprehensive solution for overall maintanance of proper digestive health. Guar fiber, however, has emerged as a credible candidate for just such a solution. This review focused on summarizing the clinically observed effects of guar fiber on digestive health. Several clinical studies suggest the guar fiber normalizes both constipation and diarrheal conditions. Also, it was effective in alleviating the symptoms associated with irritable bowel syndrome. The studies suggest that a regular intake of 5 to 10 g/d guar fiber is effective to treat most of the morbidities associated with digestive health. Guar fiber is all natural. It may offer potential protection and promotion of digestive health both alone and when combined with probiotics as a synbiotic formula.

Introduction

Digestive health plays a direct role in one's quality of life and daily performance. Digestive problems, such as irregular bowel movements, gas, bloating, and abdominal pain, may impair daily life. Irregular bowel movements such as constipation (less than 3 bowel movements per week), diarrhea (more than three bowel movements per day), irritable bowel syndrome (IBS; either constipation, diarrhea, or both associated with abdominal pain/spam), and inflammatory bowel disease (IBD) are the common morbidities associated with digestive health. Globally, >12% of the population suffers with constipation, whereas 11% suffer with IBS [1]. The World Health Organization (WHO) reported nearly 1.7 billion cases of diarrhea, of which 760 000 were in children who died annually worldwide [2]. Another report stated that IBD causes 50 000 deaths annually [3].

Although medications are sometimes indispensable for the cure of these morbidities, particularly if chronic, medical experts and dietitians often urge the use of dietary fibers for prevention and maintenance of proper digestive health [4]. Dietary fibers are available in both soluble and insoluble forms, but none are the same or equal in exhibiting their benefits due to differences in structure and function [5], [6]. Insoluble fibers have mostly viscous and bulking properties that are effective in easing constipation, but they are limited in their effectiveness against other bowel morbidities [7]. Additionally, their bulking effects may cause discomfort and aggravate complications associated with bowel diseases [8], [9], [10], [11]. Soluble fibers are fermentable to exhibit prebiotic effects by which they synthesize various amounts of short-chain fatty acids (SCFA), which are closely associated with gut health and many other physiological health benefits [12]. However, the chemical structure of the dietary fiber, their transit time in gut, the degree of fermentation, and corresponding influence on the growth of probiotics and release of SCFA greatly affects the performance of different soluble fibers [13], [14].

Previous systematic reviews suggest that dietary fibers may be effective for constipation [15] and IBS [16], but they lack explanations on the efficacy of any specific dietary fiber. Most soluble fibers are helpful in the prevention or reduction of constipation but seem to have little effect on diarrhea and IBS. In this context, guar fiber, popularly known as partially hydrolyzed guar gum (PHGG; Sunfiber, Taiyo Kagaku Co Ltd, Yokkaichi, Japan), emerged as a potential soluble fiber offering prevention and cure against all bowel morbidities, including constipation, diarrhea, IBS, and IBD. Previously, guar fiber earned Grade A recommendations from a fiber consensus group for having “Level 1 evidence” (randomized trial, meta-analysis with low risk for error) in clinical use against diarrhea and IBS and in enteral nutrition (EN) [17]. Recently, Health Canada approved guar fiber for use in childhood constipation and IBS. Also, it was approved for the alleviation of constipation and diarrhea in Japan. Therefore, the aim of this review was to summarize the clinical evidence regarding the physiological effects of soluble fibers on digestive health, with specific reference to guar fiber.

Section snippets

Guar gum versus guar fiber

Guar fiber is one form of guar gum having 100% guar galactomannans derived from the endosperm of Cyamopsis tetragonolobus L. (guar plant) seeds. The guar galactomannans are composed of mannose and galactose approximately in a 2:1 ratio. Guar gum is typically composed of very long chain galactomannans (50–8000 × 103 units) and have high molecular weight (200–300 kDa). It forms very high viscous gel (>2000 cps with 1% of guar gum) when dissolved in liquids. Therefore, it is mostly used as a

Reduction of constipation

Constipation varies by definition but essentially occurs when there is no fecal output for 3 to 4 d. Constipation has symptoms of hard feces causing difficulty in output and delayed transit time [47]. Other symptoms associated with it are painful defecation, hard or dry stool, abnormally small stool, or a feeling of incomplete rectal evacuation. Chronic constipation can lead to more serious complications, such as bowel perforations, fecal impaction, and other bowel diseases. It is important to

Reduction of diarrhea

In humans, dietary fibers are mainly fermented in the large intestine by intestinal microflora, and in this process SCFAs are produced. SCFAs are absorbed in the colon, stimulating sodium transport in several species, including humans [61], [62]. This effect may be particularly important in acute diarrheal diseases in the colon and may cause colonic dysfunction [63]. SCFA levels in the colon, therefore, may influence the clinical course of acute diarrheal conditions. Fiber added to tube-feeding

Effects on IBS

IBS is the most common disease diagnosed by gastroenterologists, with a prevalence rate of 3% to 25% in various countries. IBS is not a disease, but a functional disorder characterized by the symptoms of abdominal pain, bloating, flatulence, and bowel dysfunction. IBS could be varying with type: diarrhea-predominant (IBS-D), constipation-predominant (IBS-D), and alternating diarrhea–constipation (IBS-A). IBS-D is more common in men (48%) and IBS-C and IBS-A in women (39% and 48%, respectively)

Prebiotic effect of guar fiber and digestive health

The gut microbiome has emerged as a crucial regulator of digestive health [98], [99]. It has been found that the composition of microbiota differs between healthy and diseased individuals, wherein the ratio of good bacteria often is compromised in diseased cases [100], [101], [102]. The good microbiome consist mainly of Lactobacillus and Bifidobacterium spp and are effective against digestive disorders such as constipation [103], [104], [105], diarrhea [106], [107], [108], [109], and IBS [110].

Conclusions

Guar fiber, commonly known as partially hydrolyzed guar gum, is a non-viscous soluble dietary fiber that is effective for the treatment of constipation, diarrhea, and IBS. Fourteen clinical studies with 631 participants suggest improvement of constipation with guar fiber. Eight of 14 studies evaluated a dose <10 g/d (3.5–10 g). Therefore, the effective dose of guar fiber for constipation could be considered <10 g/d. In the case of diarrhea, seven clinical studies with a total of 465

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    TPR is employed by the company that produces guar fiber. However, this scientific review is written based on the scientific studies done elsewhere. The authors have no conflicts of interest to declare.

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