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Welcome back to the Chasing Eden podcast, where we begin
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to rediscover our body's divine design. I'm your host, Carolyn Thompson,
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and it feels great to be back. There is something
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interesting happening in nutrition right now. For years, the conversation
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seemed to revolve around everything except fiber. We counted calories,
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then we counted carbohydrates, Then fat became the enemy. Then
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carbohydrates became the enemy. Then protein became the nutrient everyone
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wanted more of. Grocery store shelves filled with high-protein yogurt,
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high-protein cereal, protein bars, and protein shakes. Also, protein cookies
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and even products that probably never needed protein added to
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them in the first place. Now, protein is important, especially...
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as we age. But quietly, another nutrient has been making
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its way back into the conversation. Fiber. Something our grandparents
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probably never called a superfood. Something that doesn't come in
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a flashy bottle. Something that is naturally found in beans, lentils, vegetables, berries, apples, oats, barley, nuts, seeds,
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and whole grains. And suddenly, social media has even given
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eating more fiber a name. Fiber maxing. But here's what's fascinating.
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Scientists didn't suddenly discover fiber in 2026. We've known for
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decades that diets containing adequate fiber are associated with better
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digestive health and lower risks of cardiovascular disease, type 2 diabetes,
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and colorectal cancer. What we're beginning to understand much more
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deeply is why. Fiber isn't simply roughage that helps you
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go to the bathroom. Different fibers behave differently. Some absorb water.
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Some create gels. Some slow digestion. Some interact with cholesterol
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and bile acids. Some are fermented by bacteria living inside
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your colon. And then those microbes consume certain fibers. They
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create compounds called short-chain fatty acids, including acetate, propionate, and
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butyrate that may influence the intestinal lining, inflammation, and metabolism.
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In other words, when you eat certain plants, you aren't
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only feeding yourself, you're feeding an ecosystem living inside of you.
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And that changes the entire fiber conversation. Today, we're going
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to investigate why fiber has returned to the center of
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nutritional science. We're going to compare American recommendations with Britain
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and France. We'll talk about soluble fiber, insoluble fiber, fermentable fiber,
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resistant starch, and prebiotic fibers. We're going to look at
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what happens to blood sugar when fiber is present in
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a meal. We'll look at insulin, cholesterol, fat absorption, sachety, constipation,
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the microbiome, and yes, bloating. Because that's where many people
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run into trouble. Someone hears that fiber is healthy, goes
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from barely eating any to loading breakfast with bran, chia,
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and flax, eats a giant bean salad for lunch, takes
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psyllium in the afternoon, and by dinner they're wondering why
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their stomach feels like a balloon. We'll explain why that happens.
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We'll also answer another important question. If fiber is so important,
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why can't I just take psyllium husk every morning and
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call it good? Psyllium can absolutely be useful. But psyllium
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and a fiber-rich diet are not biologically identical. And finally,
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we're going to talk about something astonishingly simple that almost
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nobody discusses when talking about digestion. Chewing your food. And today,
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we're asking whether one of the biggest nutritional breakthroughs of
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the moment isn't actually something new at all, but something
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modern food gradually removed. So let's begin with the simplest question.
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What is dietary fiber? It's not as simple as you think.
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Broadly speaking, dietary fibers are carbohydrates found primarily in plant
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foods that aren't completely digested and absorbed into the small
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intestine the way sugars and many starches are. Instead, much
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of that material continues toward the large intestine. But calling
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all of it simply fiber can be misleading because fibers
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can behave very differently. You've probably heard fiber divided into
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two categories, soluble and insoluble. That's useful, although modern nutritional
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science also classifies fibers according to characteristics such as viscosity
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and fermentability. Let's start with soluble fiber. As the name suggests,
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soluble fiber can interact with water. Some soluble fibers from
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viscous gel-like material inside the digestive tract. Sources include foods
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such as oats, barley, Beans, lentils, peas, apples, citrus fruits, carrots,
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and psyllium. These viscous fibers can slow the movement of
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nutrients through the parts of the digestive process. That's important
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when we get to glucose and cholesterol. Then there's insoluble fiber.
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It doesn't dissolve in water in the same way. It
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adds bulk to stool and helps material move through the
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digestive tract. You'll find it in foods including wheat bran,
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many whole grains, vegetable skins, nuts and seeds. But there's
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another characteristic that's arguably even more fascinating, and that's called fermentability.
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Some fibers can be fermented by microbes living in the colon.
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Those microbes break them down and produce metabolites. including the
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short-chain fatty acids I mentioned earlier. One particularly important one
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is butyrate. Cells lining the colon can use butyrate as
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an energy source. Then there are naturally occurring prebiotic fibers.
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You've probably heard the word probiotic. A probiotic is generally
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a beneficial live microorganism. A prebiotic, on the other hand,
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is a substrate selectively used by microorganisms that can confer
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a health benefit. Foods containing prebiotic compounds include onions, garlic, leeks, asparagus, chicory,
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Jerusalem artichokes, legumes, and certain whole grains. And then we
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have resistant starch. This starch that resists digestion in the
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small intestine and reaches the large intestine where microbes can
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ferment it. You can find resistant starch in foods such
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as legumes and green bananas, and the amount can also change,
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depending on how certain starchy foods are cooked and cooled.
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So already we have a problem with saying, I got
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my fiber. Which fiber? From what food? Was it viscous?
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Was it fermentable? Did it come packaged inside a bean
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containing resistant starch, polyphenols, minerals, and protein? Did it come
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from oats containing beta-glucon? Did it come from an apple
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containing pectin? Or did it come from a scoop of
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isolated fiber? Those things aren't necessarily interchangeable. And this leads
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us to one of the most important lessons of today's episode.
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Fiber isn't one nutrient doing one job. It is a
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family of compounds performing different jobs throughout the digestive system.
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Now let's compare recommendations. American dietary guidance has traditionally expressed
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fiber needs as approximately 14 grams for every 1,000 calories consumed.
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For many adults, that works out somewhere in the neighborhood
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of the mid-20s to upper 30s, depending upon age, sex,
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and calorie needs. Britain took a very clear approach. Adults
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are advised to consume 30 grams of fiber per day.
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France also lands around that neighborhood. French guidance commonly recommends
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approximately 30 grams per day with current French public health
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information describing a range of about 25 to 40 grams,
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including soluble fiber. So you might expect Europeans to be
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eating mountains of fiber while Americans live on cheeseburgers. Not exactly.
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This is where the story gets more interesting. Britain's latest
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National Diet and Nutrition Survey found adults averaging only about
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16 to 17 grams per day Only around 4% of
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adults in that survey met the 30-gram recommendation. France has
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also struggled to meet its target, with national intake data
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placing average adult consumption around 20 grams per day in
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previous surveys. So this isn't America is bad and Europe
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is perfect. It is something much larger. Modern industrialized societies
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appear to have developed a fiber problem. But there are
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still cultural differences worth examining. Traditional Mediterranean eating patterns naturally
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include foods such as beans and lentils, chickpeas and vegetables, fruits,
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nuts and seeds, as well as whole grains and minimally
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processed plant foods. Traditional British diets also contain fiber-rich foods too,
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like oats, barley, peas, beans, root vegetables, and whole grain breads.
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Traditional French food culture contains lentils, beans, vegetables, fruit, and
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whole grains alongside animal proteins. Compare that with the modern
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American food environment. White bread, refined breakfast cereal, pastries, french fries, chips,
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and sugary drinks. Also, refined snack foods, fast food buns,
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and pizza made from refined flour, as well as desserts,
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and ultra-processed convenience foods. We're eating plenty of carbohydrate. But
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carbohydrates and fiber are not synonymous. You can eat a
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very high-carbohydrate diet that's surprisingly low in fiber. Take wheat.
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The intact grain contains multiple structures and nutrients. Refining it
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into white flour removes much of the bran and germs.
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The resulting product can still provide carbohydrate calories, but it
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is not nutritionally identical to the original grain. I recommend
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milling your own wheat berries. In that way, you are
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keeping the bran and germ intact, and also the nutrition
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is going to be higher because wheat loses nutrition once
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it has been milled. The same principle applies throughout our
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food system. Processing isn't automatically bad, but cooking is processing
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and freezing is processing as well as pre-milling your wheat.
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Fermentation is also processing. Canning is processing. The issue is
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what happens when our dietary pattern becomes dominated by highly
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refined foods that have had much of their original structure
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and fiber removed. We didn't necessarily stop eating carbohydrates. We
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changed the kind of carbohydrate we were eating. and the
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consequences may reach far beyond constipation. So now let's talk
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about the forgotten organ, your microbiome. Imagine hosting trillions of
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microorganisms and never feeding them. That's essentially part of the
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modern fiber problem. The large intestine contains a complex ecosystem
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of bacteria and other microorganisms. They don't all eat the
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same things. different dietary substrates can favor different organisms and
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metabolic pathways. When fermentable fibers reach the colon, microbes can
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metabolize them. The result can include gases, which we'll come
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back to in short-chain fatty acids. One of those is butyrate.
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Butyrate has attracted enormous scientific attention because colon cells use
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it as an important energy. You can purchase butyrate in
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capsule form, very inexpensively. There is also a relationship between
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the intestinal barrier function and immune signaling as far as
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butyrate is concerned. Another one is called propionate, and another
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one is acetate. This is one reason why fiber diversity matters.
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Eating oats isn't exactly the same as eating lentils, and
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eating lentils isn't the same as eating onions. Eating onions
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isn't the same as eating berries. Eating berries isn't the
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same as eating flaxseed. Different plants contain different combinations of fibers,
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resistant starches, and polyphenols. And they encounter different microbial populations.
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Think of your garden. You planted one crop in every
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square inch of soil year after year, and you wouldn't
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call that ecological diversity. Yet sometimes that's how we approach
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fiber consumption. we find one fiber supplement and we assume
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we're done. But the gut microbiome isn't a drainpipe, it's
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an ecosystem. And ecosystems generally thrive on diversity. This is
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why the resurgence of fiber may ultimately become less about
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hitting one magic number and about restoring a broad range
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of plant foods to the diet. When we come back,
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We're going to follow fiber through an actual meal. What
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happens when you eat carbohydrates with fiber? What happens to glucose?
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What happens to insulin? And what happens to dietary fat
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and cholesterol? Then we'll tackle a question millions of Americans have.
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If psyllium works, why isn't a scoop of psyllium enough?
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Stay with me. Let's talk about what fiber actually does
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inside of you. Let's imagine two meals. Meal number one
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contains refined carbohydrate that is digested relatively quickly. Meal number
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two contains carbohydrate inside an intact or minimally processed food
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matrix with viscous fiber. These foods can behave differently during digestion.
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Certain soluble viscous fibers absorb water and create a thicker
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environment inside the digestive tract. That increased viscosity can slow
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gastric emptying and slow the rate at which digestive enzymes
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and nutrients interact. As a result, glucose may enter the
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bloodstream more gradually. That can reduce the size of speed
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of the most meal glucose rise in certain contexts. And
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if glucose enters the bloodstream differently, the insulin response can
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also change. So we're talking about the speed of the
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post-meal glucose rise in certain contexts. If the glucose enters
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the bloodstream differently, the insulin response can change. So insulin
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is not really, it's not the enemy. And let me
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say again that because the internet has done terrible things
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to this conversation, insulin is not a toxin. It's an
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essential hormone. Without insulin, we cannot properly regulate our blood
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glucose levels. The issue is chronically impaired insulin sensitivity and
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metabolic dysfunction and not the existence of insulin. Research on
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viscous soluble fibers is particularly interesting here A meta-analysis of
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28 controlled trial comparisons involving nearly 1,400 people with type
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2 diabetes found that viscous fiber supplementation improved several measures
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of glycemic control. Average HbA1c fell by roughly 0.58 percentage
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points compared with control conditions along with improvements in fasting
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glucose and insulin-resistant measures. That doesn't mean fiber replaces diabetes medication.
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It doesn't mean everyone gets that exact result either. And
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it certainly doesn't mean someone with diabetes should change treatment
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without their clinician. But it does demonstrate something important. Food
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structure and fiber can meaningfully influence metabolic physiology. And that's
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one reason the question shouldn't simply be, how many carbohydrates
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did I eat? A cup of lentils and a cup
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of candy aren't metabolically interchangeable simply because both contain carbohydrates.
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One comes packaged with fiber, protein, minerals, and a complex
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food structure. The other doesn't. Context matters. Dr. Rhonda Patrick
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points out that fiber, she says, quote, unquote, Fiber is
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our best bet against microplastics, unquote. The best way to
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excrete plastics is to poop it out. So now let's
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talk about fat. Certain soluble viscous fibers can interact with
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bile acids. Your liver uses cholesterol to produce bile acids
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which help digest fats. Normally some bile acids are reabsorbed
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and recycled, but viscous fibers can increase the amount that
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leaves the body in stool. The liver is then needs
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to make more bile acids. That process and one mechanism
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by which certain fibers can help lower LDL cholesterol. Beta-glucon
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from oats and barley has been studied for this. So
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has psyllium. And if you're looking for a great website
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that will help you get started in your fiber journey,
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I highly recommend The Doctor's Kitchen with Dr. Rupi Hajula.
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This website allows you to easily plan for eating a
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diverse group of fibers in your meals, and it makes
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it easy and delicious. My husband Eric and I have
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really enjoyed these last few weeks eating Dr. Rupi's recipes.
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A major meta-analysis found that soluble fibers, including oat, psyllium,
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and pectin, produced modest but significant reductions in LDL cholesterol.
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And on Dr. Rupi's website, The Doctor's Kitchen, he has
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an app. And it really does help you include all
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of these wonderful different types of fibers into your meals
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without really having to think about it too much on
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your own. So notice that in the meta analysis, the
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soluble fibers, which included oats, psyllium, and pectin produced modest
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but significant reductions in LDL cholesterol. Notice the word modest.