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we've all been told a million times that
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we should include
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more fiber in our diet and we're given
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multiple reasons for this
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the purpose of this video is to question
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how much
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fiber should we be getting in our diet
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and more importantly what does the
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research
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actually say about this not necessarily
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epidemiological observational research
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that's based on food
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frequency questionnaires but what does
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actual randomized control research
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say about the fiber question i'm dr ken
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berry a family physician with 20 years
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of clinical practice
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and this video is going to help you
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understand how much fiber do you need to
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eat each and every day
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all you have to do is turn on the
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television or read a magazine article or
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jump on twitter
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and you're going to be told things over
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and over like
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eating more fiber helps support weight
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loss lowers your cholesterol
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lowers your blood sugar improves your
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heart health prevents diabetes
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completely
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helps constipation decreases your risk
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of colon cancer or my personal favorite
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that it detoxes some part of your
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body now people who have ever taken
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too much fiber either from fiber
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containing foods
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or from a fiber supplement will tell you
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that the side effects of having too much
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fiber are
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no fun whatsoever they include gas
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lots of gas bloating constipation
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diarrhea wait a minute constipation
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yeah and cramping and actually worsening
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of irritable bowel syndrome
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symptoms so it's it's almost like your
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bowel is telling you
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hey don't eat all this fiber but
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many powers that be including the fda
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and the american heart association say
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hey you need to eat lots of fiber
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if you're a man you should eat from 30
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to 38 grams each and every day if you're
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a woman
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you should eat 21 to 25 grams each and
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every day
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if you're a child between the ages of
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one and eight you should eat 14 to 31
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grams
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each and every day so what does the
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research say
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but first let's talk about where this
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idea even came from
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who had the bright idea that we should
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eat lots of fiber
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in our diets it actually comes from a
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british surgeon by the name of dennis
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burkett
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and he was a very very intelligent
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surgeon
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there's actually a childhood cancer
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burkitt's lymphoma
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named after him he was very prominent
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british surgeon
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he practiced in africa for years and he
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noticed that the african natives
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who were his patients had these
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ginormous poops several times a day
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and he also noticed that they ate a lot
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of fiber in their diet
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and he also noticed that they didn't
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have colon cancer
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very often and they definitely didn't
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have constipation
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and they didn't really seem to have any
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other bowel issues
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and so he came up with this hypothesis
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that eating a high fiber diet
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should protect the human body from lots
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of things including constipation and
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colon cancer
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so this idea literally came from an
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impromptu
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hunch that a single individual had
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he did not do any control research he
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did not do
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any meaningful research on this
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whatsoever he just
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wrote a book about this and became known
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as the fiber guy
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and lectured all over the world and
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since as i
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mentioned earlier he was a very
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prominent british surgeon
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and he had done some very good work in
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other areas people
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tended to take what he said as gospel
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one thing that you need to understand is
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that these africans that he was studying
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and practicing on
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they also didn't need any added sugar
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whatsoever and they also didn't eat any
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highly processed grains and they also
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didn't eat
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any vegetable oils so there's that
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he also had one other hypothesis which i
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tend to agree with
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uh he hypothesized that squatting is a
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better
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position to take a bowel movement in
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than sitting and that it would help with
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constipation and other bowel problems
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now
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i think that hasn't been proven either
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but i think he may have been onto
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something there
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now let's talk quickly about what fiber
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actually is
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fiber is plant matter that our gut
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absolutely cannot digest it
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is well basically it's the same exact
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thing as sawdust
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or cardboard okay so uh
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when you start looking at some of these
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claims like it prevents
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it it helps you lose weight well if i
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took you
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where you're at right now and i replaced
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10 or 20
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of your diet with sawdust and every day
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we just mix sawdust into your oatmeal
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and into your corn flakes
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and so you were getting 10 to 20 more
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fiber a day
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fiber that your body cannot break down
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cannot use as nutrition in any way
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whatsoever
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doesn't contribute any calories
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carbohydrates protein fat to your diet
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well duh yeah you're going to lose
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weight because i'm feeding you something
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you cannot use
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is nutrition right this is also the way
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it lowers your blood sugar
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because however much of your diet you're
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replacing
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with fiber is giving you no nutritional
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benefit at all including no
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carbohydrates so of course your blood
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sugar is going to come down
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as for the claim that it improves heart
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health or decreases your risk of heart
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attack or stroke
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again we're replacing 10 to 20 percent
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of your diet with
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sawdust or cardboard every day so you're
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not able to eat
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that much in volume of sugars and grains
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and vegetable oils so we're basically by
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putting 10 to 20 sawdust into your diet
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you're not able to eat the things that
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are actually increasing your risk of
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heart attack and stroke
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so yeah that kind of makes sense now
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there is the argument
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that gut bacteria living in your large
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intestine
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can break down this fiber and use it
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and then somehow magically you derive
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nutrition from that now it is true that
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the
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the bacteria in your gut can break down
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this fiber and they can use it as fuel
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because they can actually break the
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cellulose down
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but you cannot now there is some limited
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evidence that the short chain fatty
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acids that these bacteria produce
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from eating the cardboard and the
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sawdust
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can move across the cell membrane of
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your enterocytes which are the cells
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that line your gut wall
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and you're parasites probably do benefit
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from these short
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chain fatty acids a little bit but
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that's not really nutrition for you
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that's just those cells now
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the truth is those cells get plenty of
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short chain fatty acids from your
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circulation
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like your cells are supposed to get
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nutrition from right
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and there's very little evidence that
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your entire body actually benefits
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from these short chain fatty acids
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whatsoever now
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what these bacteria also make in
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addition to the short chain fatty acids
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is they also produce lots of greenhouse
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gases
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like methane and carbon dioxide and you
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experience this
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in the form of gas and farts and so by
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eating a high fiber diet
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are you actually contributing to global
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warming
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now let's look at the actual research
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to support all these claims about fiber
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so the weight loss claim with regards to
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eating more fiber
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has literally never been proven there
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are some epidemiological studies that
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show a possible
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association but there is no control
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research showing any causation
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whatsoever
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so mark that one off your list what
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about preventing diabetes and lowering
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blood sugar
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well i talked about earlier how this
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might happen if i made you eat twenty
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percent of your diet as
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cardboard well yeah you're not getting
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any carbohydrates that you can use
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so therefore your blood sugar is going
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to come down and your you won't develop
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diabetes
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but that's kind of a weird way to
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prevent diabetes and
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surely there's a better way than that
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what about improving your heart health
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well uh there's literally no research
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that's that's of a controlled fashion
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that proves this or shows any
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kind of causation it's all
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epidemiological research
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now the detox thing anybody anytime
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anybody
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on the planet says hey buy my product
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and it will
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detox your liver or your kidneys or
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whatever
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you can officially hit the unfollow
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button right
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there or the block button because that's
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[ __ ]
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okay if you want to detox any part of
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your body
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you fast that's how you do that that
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it's cheap easy free
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side effect free you never buy a product
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to detox your body
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what about the claim about constipation
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eating more fiber helps with
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constipation
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anybody who has irritable bowel c or
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chronic constipation or idiopathic
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constipation they'll answer this
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question for you anybody
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who's tried to eat more fiber for
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constipation put put in the comments
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what your actual results were
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because the results are always more gas
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more bloating
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maybe more constipation or diarrhea and
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cramping
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those are not solutions okay just
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because you're putting more
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roughage in that your body has to expel
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as quickly as possible
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that doesn't mean you're you're
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meaningfully treating the constipation
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there's actually a a very well done a
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little study on this let me read you the
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conclusion
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this was a study done in 63 patients and
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what they did was they gave them
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different and they all suffered from
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idiopathic constipation
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and the researchers gave them different
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amounts of
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fiber and and one group they gave no
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fiber and then they they kind of swapped
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them around and kept playing with this
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and here's their conclusion idiopathic
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constipation and its associated symptoms
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can be effectively reduced
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by stopping or even lowering the intake
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of dietary fiber so
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there's a link down in the show notes if
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you want to read the whole study it
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i know really you're probably sitting
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there going wait what
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i thought what what yeah exactly so
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fiber does not help in any meaningful
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way with idiopathic constipation chronic
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constipation
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or ibs c
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it doesn't help with any of those it's
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going to make you have worse symptoms
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the more you cut your fiber the better
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your symptoms will be
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now let's talk about colon cancer
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because that's really once you've
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narrowed some a pro fiber person down
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this is the one they're always going to
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cling to is that it decreases your risk
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of colon cancer
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so let's talk about a study and again
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the links are down in the show notes
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below so you can check this out for
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yourself
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it's a meta-analysis of five randomized
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control
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trials in humans that's important right
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and so they they analyzed these five
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different studies
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that purported to well they had the
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hypothesis that that eating more fiber
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decreased your risk of colon cancer
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here's the conclusion from this study
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there is currently
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no evidence from randomized controlled
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trials to suggest that increased dietary
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fiber intake
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will reduce the incidence or recurrence
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of adenomas polyps within a two to four
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year period
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adenominous polyps are the precursors of
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colon cancer so
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no evidence no rcts to even suggest this
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okay now let's go to another study this
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study was published in
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the journal of the american medical
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association it was a meta-analysis of
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13 cohort studies very very large
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studies
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and after they crunched all the numbers
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here's the conclusion they found
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in this large pooled analysis dietary
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fiber intake was inversely associated
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with
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risk of colorectal cancer in
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age-adjusted analysis
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however however that's an important word
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after accounting for other dietary risks
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high dietary fiber intake was not
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associated
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with a reduced risk of colorectal cancer
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yep you heard me right so now let me
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answer the question that was asked in
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the title of this video
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how much fiber do you need each day well
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according to the randomized controlled
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trials and the actual research on actual
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human beings
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you don't need any okay if you happen to
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eat some fiber occasionally i don't
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think it's dangerous or bad
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it's probably not a big deal it may lead
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to increased
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gas bloating constipation diarrhea and
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cramping if you eat too much
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but do you need to try to get the the 21
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to 38 grams that the american heart
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association
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recommends no you don't there's zero
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research
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reports supporting this so why did the
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aha say this
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i'm not sure maybe we should ask them in
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a tweet the fda
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said the same thing what research did
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they base it on
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none it is all based on an impromptu
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hypothesis had by a very famous british
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surgeon
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decades ago and there has never been a
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credible study
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to show causation between fiber and any
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of the things
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that you will hear as potential benefits
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for getting more fiber
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in your diet therefore stop trying to
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get fiber in your diet
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if you're taking a fiber supplement
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throw that crap in the garbage it's a
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waste of money
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if you're trying to eat high fiber foods
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that you don't really like
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stop doing that okay just eat more fatty
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meat
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you don't need fiber fiber's never been
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proven to help you in any meaningful way
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now your gut bacteria they appreciate it
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when you eat fiber
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and they make carbon dioxide and methane
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to warm the
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the atmosphere when you do so maybe
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think
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twice before taking another fiber
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supplement or eating another high fiber
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food
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i sure hope this video has cleared up
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some confusion you may have had about
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fiber
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in your diet if you haven't already done
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so please consider clicking that
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subscribe button and the bell button
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right beside it
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i try to post two to three new videos
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every week and that way you'll get a
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notification and you don't miss it
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when i call out institutions that are
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saying something they should know better
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than to say this is dr barry i'll see
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you next time