Reprinted with permission from World At Large, a news website reporting on nature, science, health, and travel.

Without having much education on the subject, most people understand that fiber is an important part of a healthy diet. There are many reasons why fiber is an invaluable nutrient to the human species, but only 5% of Americans are likely to consume an ideal amount of it as recommended by the US Dietary Guidelines.

Misunderstandings about what fiber actually is, what fiber does, where it comes from, and how much is required, altogether serve to distort the picture of fiber in the diet. Most Americans are aware that fiber is good for digestion and for promoting healthy bowel movements, but beyond the stick of celery with buffalo wings and whole wheat bread, statistics show that people don’t actually know very much about it.

The consequences of misunderstanding fiber result in far more than the occasional bout of indigestion, and they can result in a variety of different upsets from immune-system health to hormonal production.

Fiber and the Gut

Complex carbohydrates retain their hearty structure as they travel down the gastrointestinal tract. Simple carbs and sugars, on the other hand, are often fully pulverized long before they reach the large intestine or colon, which deprives the bacteria in this digestive region of receiving any nourishment.

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The colon is the eventual destination of dietary fiber, and it’s there that the complex carbs which survive the downward journey are fermented by the microbes which make up our gut microbiota – allowing for a rather fascinating biological process to occur.

When fiber is consumed by the buggers in our colon, their waste products are utilized by our body as nutrients. For instance, short chain fatty acids are one of these compounds that are produced when dietary fiber is fermented in the colon. One short chain fatty acid called butyrate acts as the primary energy source for colonic cells, and are key for colonic health and warding off colon cancer.

T-regulatory cells are members of the immune-cell family which calm the immune system, preventing them from aggressively targeting the host’s biology with excessive inflammation and damage. If dietary fiber is not consumed it’s likely the immune system is operating in a hyper-inflamed state.

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It’s this hyper-inflammatory state that has been linked with the increased numbers of cases of chronic autoimmune diseases like IBS, along with food allergies and asthma, and most metabolic disorders. In fact, inflammation seems to be the primary indicator and driver of aging, with most centenarians and supercentenarians displaying a telling lack of inflammation.

If starved of complex carbs, the only source of nourishment for the bacterial ecology within the gut is mucin cells within the mucus membrane which line the inside of the GI track. The obvious danger is the enhanced gut permeability going in both directions. Immune-cells from inside the body inflame and target the bacteria in the gut, while bacteria which would otherwise be harmless if it remained in the gut, can seep into the bloodstream causing further inflammation as the immune-system seeks to destroy the harmful agent.

Dig in the Dirt

Most foods that are minimal sources of fiber display the “Good source of fiber” USDA designation loudly on their packaging. While many cereals and whole grain/wheat breads and pastas may advertise 3 to 4 grams of fiber per serving, they are also loaded with inflammation-inducing simple carbohydrates, like sugar and wheat flour, and are normally fortifying it with only one form of supplemental fiber, rather than a compliment of different starches and cellulose that you’d find in vegetables.

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That’s why the best sources of fiber are good old-fashioned, dirt-covered produce.

Unlike packaged foods such as cereal or different snack bars, vegetables and fruits contain a compliment of important phytonutrients including polyphenols, alkaloids, keratinoids, and tannins.

Split peas, lentils, and beans are the best commonly available source of fiber by weight. Other great sources are vegetables like collard greens, broccoli, brussels sprouts, and green peas. Starch-heavy vegetables like acorn and butternut squash, turnips, parsnips, are also good choices. Finally, nuts and stone fruit, eaten with their skins on, can be a supplemental fiber source.

A History of Chewing

In a paper titled Paleodietics the author provides a graph demonstrating the immense drop in the presence of fiber in man’s plant based food sources as he left the paleolithic-era behind. This is due to several reasons, not least of which is the invention of agriculture and the domestication of wheat, grains, and fruit. Early agri-communities began to select for palatability rather than fiber content, resulting in sweeter, and more easily digested produce.

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There are a number of scientific papers written on the topic of pre-agricultural societies and their consumption of fiber. While the USDA states that 18 grams of fiber per 1,000 calories is required to stave off the effects of fiber deficiency, early ancestors likely consumed twice that figure or more of fiber in their diet.

In his book The Human Diet, Steven Unger outlines the presence of fiber in monkey and chimpanzee diets. His team has found that over a year of studying chimps and 3 different species of monkey in Uganda, that chimpanzee diets are extremely high in fiber, and that like humans, they can digest these compounds due to fermentation in the colon and large intestine.

Considering the presence of fiber in the diets of primitive societies and in chimpanzee populations, it seems that we undoubtedly evolved to consume large amounts of fiber, both insoluble and soluble. Moreover, through the understanding of how complex carbs interact with the bacteria in the gut, we understand that not only did we evolve to eat them, but that they facilitate the production of vital components for our longterm health.

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