In contrast insoluble fiber, which does not dissolve in water, is inert to digestive enzymes in your upper gastrointestinal tract. While some forms of insoluble fiber (like resistant starch) can ferment in your colon, most insoluble fiber moves through your digestive system relatively unchanged, absorbing water as it goes, eventually adding bulk to your stool and easing your bowel movements.
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Dietary fiber refers to nutrients that are not digested by gastrointestinal enzymes. While true fibers are digested, they are not digested in the small intestine like normal carbohydrates, but rather are digested (fermented) by bacteria in the large intestine. True fibers should only be digested by the bacteria in the large intestine. Referring back to the previous example regarding the fitness expos, you can certainly “smell,” and often experience which high fiber bars have some “true” fiber based on the fermentation and digestion.
The increased awareness regarding the importance of fiber, in addition to its distinct metabolic effects, has resulted in a surge of companies switching to an alternative fiber known as soluble corn fiber (SCF). Interestingly, SCF has been available on the US market since 2007 and is used in foods and beverages across the Americas, Europe, and Southeast Asia. SCF is produced through an extensive process: corn syrup is exposed to a suite of enzymes for at least 48 hours, some of which are found in the brush border of your small intestine, as well as the pancreas. Notably, a large majority of the corn syrup contains easily digestible carbohydrates; however, a small portion is, in fact, not digestible. At the end of this enzymatic exposure, a stream of digestion-resistant carbohydrates remains and is subsequently filtered several times. The resulting product is a “true fiber” that contains a mixture of α-1,6, α-1,4, α-1,2, and α-1,3 glucosidic linkages, which, as mentioned above, contribute to its low digestibility.
Dr. Ryan P. Lowery is the CEO of Ketogenic.com, author of The Ketogenic Bible, President of the Applied Science and Performance Institute and KetoPhD™. His mission is to spread awareness around the Ketogenic Lifestyle and its’ many benefits beyond body composition. He earned his BS and MS in exercise physiology and exercise and nutrition science from the University of Tampa and completed his doctorate work at Concordia University in Health and Human Performance with a focus on “The Effects of a Well-Formulated Ketogenic Diet and Exogenous Ketone Supplementation on Various Markers of Health and Body Composition in Healthy and Diseased Populations.” Over his career, Ryan has published over 150 papers, abstracts, and book chapters on human performance and sports nutrition and has dedicated his life to educating the masses. In his free time, Ryan enjoys spending time with his best friend, Scoot the Keto Pup, jet skiing, and traveling around the world. The way to his heart is through a good glass of wine and Keto desserts.
Another significant benefit of the ketogenic diet is that you avoid the big spikes in blood glucose levels caused by excessive carbohydrate consumption. Because some of the benefits of eating dietary fiber come from improved glycemic control, your fiber needs may be further reduced on the keto diet since your glycemic control comes from eating very few carbs.
As observed by the graphs above, in contrast to the IMOs in which blood glucose rapidly increased to 125 mg/dL, SCF did not elicit any blood glucose response. In addition, while insulin was elevated during the IMO condition, it actually tended to go down in the SCF condition! Despite the results from the blood glucose and insulin responses, the breath hydrogen assay will distinguish which is a “true fiber.” Our data below clearly indicates that SCF indeed passes into the large intestine, as indicated by the large breath hydrogen response. In stark contrast, IMOs do not.
If you are aware of what you’re eating throughout the day, you can better plan for indulgences. When traveling to a place that is known for their cuisine, enjoy eating while remaining balanced about your diet. Instead of getting a sweet all to yourself, maybe share it with whoever you are going. By sampling small portions of food, instead of overeating till you feel sick, you can enjoy your vacation food while still keeping your Keto Diet in mind. Alternatively, be sure to get as much exercise as possible (walk to destinations instead of taking a bus or driving), and the extra exertion will help use up any extra calories (or carbs) that you may eat.
I still crave eggnog as we get closer to Christmas. Luckily, it’s pretty easy to make a keto, sugar free version of eggnog. Keto eggnog is a combination of cream, and/or nut milk, egg yolks and your favorite sweetener. The hardest part is heating iy on the oven slowly to make sure the egg yolks don’t curdle. Even if you do curdle, you can strain them out and you will be left with creamy low carb eggnog.
IMOs can be made in several ways, but they are primarily derived from a sugar called maltose. IMO is promoted as a prebiotic fiber with a light sweetness profile. Its functional properties (i.e., moisture retention, low viscosity) make it well-suited for nutrition bars, cookies, candies, and the like. In order to fully understand IMOs and how the body processes them, we first need to understand how starches are digested in the body. Starches, also known as polysaccharides, are long and sometimes branched chains of glucose molecules. Initially, starch digestion begins in the small intestine with an enzyme called α-amylase. A-amylase breaks these long glucose chains into much shorter chains, called oligosaccharides, which are composed of anywhere from two to approximately 10 glucose units. Following this, specific enzymes on the brush border of the small intestine break down these oligosaccharides even further, into individual glucose units (monosaccharides) which are then absorbed.