Far from being just another diet fad, the call to eat more fibre is actually based on recent scientific evidence of the role it plays in maintaining our health. Discover why you should increase your intake of dietary fibre, and how to do so.
Fibre refers to a group of substances which are a type of carbohydrate, and which are primarily classified as polysaccharides. Fibre has the distinct feature of being used by the body despite not being completely broken down or absorbed.
There are many types of fibre (1) : pectin, beta-glucans, inulin, gums, psyllium, fructo-oligosaccharides (which you’ll find in the supplement Fructo-Oligosaccharides), galacto-oligosaccharides, cellulose, hemicellulose, etc.
Fibre is usually classified as being either soluble (primarily found in fruit and vegetables) orinsoluble (mainly present in grains and pulses).
Originally, it was thought that fibre was of no benefit to health as, unlike other food groups, it is not digested in the small intestine. But more recently, it has attracted renewed interest with studies revealing the role it plays in digestion (2-4).
Insoluble fibre primarily has a mechanical function in gastrointestinal transit (5). In absorbing water and remaining undigested, it increases the volume of the food bolus which arrives in the gut, thus activating intestinal motility. The presence of a substantial food bolus encourages the gut – effectively a muscle – to contract.
Thus, insoluble fibre promotes GI transit naturally and gently, without producing the rapid and sometimes unpleasant effect of foods such as prunes (these work using a different process).
With regard to soluble fibre, it dissolves in water in the digestive system and becomes more viscous, forming a kind of gel. In this way, it extends the time the food bolus stays in the digestive system which optimizes the absorption of a number of metabolites (6).
Unlike other food groups which are digested in the small intestine, soluble fibre is only digested in the large intestine, where it is fermented by certain enzymes, and where it delivers numerous nutrients to the gut microbiota (7).
The EFSA’s Panel on Dietetic Products, Nutrition and Allergies has established dietary reference values for intake of carbohydrates, dietary fibre, fats and water (8).
According to this European body, the amount of dietary fibre needed for normal gut function in adults is 25 grams a day.
It adds that a higher adult fibre intake is probably beneficial for health (by helping to both reduce the risk of heart disease and type 2 diabetes, and maintain a healthy weight).
To stay healthy, it’s therefore important - whatever your age - to maximise your dietary fibre intake, especially insoluble fibre.
Excess fibre is never toxic for the body. However:
In all cases, if you suffer from any bowel or digestion-related disease, you are strongly advised to consult your doctor and/or nutritionist before making any changes to your diet.
“Make sure you get your 5-a-day!” This somewhat simplistic message contains an undeniable truth: that eating at least 5 portions of fruit and vegetables a day is a good starting point towards ensuring a reasonable fibre intake.
Take care, however, not to rely on fruit or vegetable juices to meet your requirements: in the juice production process, the fibre gets removed!
It’s also advisable to minimise your consumption of refined cereals, and instead eat their unrefined counterparts: wholegrain rice, whole wheat, oats, etc. which are also high in fibre.
In short, an eating plan that’s similar to an acid-base or paleo diet is an excellent choice for optimising your fibre intake.
You can also do this with the help of dietary supplements.
The fibre in locust bean belongs to the family of gums.
When it dissolves in fluids in the stomach, it swells and forms a kind of gel which fills up the stomach and makes it empty more slowly.
In this way, the fibre in locust bean/carob gum accelerates the feeling of satiety and promotes weight loss by reducing the amount of food you eat. And at the same time, it provides a quality substrate to nourish gut flora (11-12).
Carob fibre is available in supplement form (try, for example CSAT®). Or you could opt for the excellent alternative, acacia gum fibre (available in the supplement Organic Acacia).
Blond psyllium is part of the plantain family.
Its seeds are composed almost exclusively of the insoluble fibre hemicellulose which is why blond psyllium has been used for thousands of years to treat sluggish or excessively fast GI transit.
Indeed, as mentioned earlier, insoluble fibre plays a role in regulating GI transit.
You can benefit from the seeds ofPlantago ovata by supplementing with Psyllium Husk (13).
The wood and bark of American larch contain high levels of arabinogalactan, a polysaccharide which is also found to a lesser degree, in carrots, radishes, tomatoes, pears and wheat (and to a significant degree in the supplementArabinogalactan, made from extracts of American larch) (14).
A type of soluble fibre, arabinogalactan supports intestinal health and provides gut flora with high-quality nutrients.
It’s worth noting that arabinogalactan can also be found in synergistic formulations such as Lectin Flush, which also contains pectin and glucosamine (two other types of soluble fibre) as well as sodium alginate.
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