What Do The Different Kinds Of Fiber Do? 30 Foods That Rank Highest
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We’ve talked before about how important fiber is:
Why You’re Probably Not Getting Enough Fiber (And How To Fix It)
And even how it’s arguably the most important dietary factor when it comes to avoiding heart disease:
What Matters Most For Your Heart? Eat More (Of This) For Lower Blood Pressure ← Spoiler: it’s fiber
And yes, that’s even when considered alongside other (also laudable) dietary interventions such as lowering intake of sodium, various kinds of saturated fat, and red meat.
So, what should we know about fiber, aside from “aim to get nearer 40g/day instead of the US average 16g/day”?
Soluble vs Insoluble
The first main way that dietary fibers can be categorized is soluble vs insoluble. Part of the difference is obvious, but bear with us, because there’s more to know about each:
- Soluble fiber dissolves (what a surprise) in water and, which part is important, forms a gel. This slows down things going through your intestines, which is important for proper digestion and absorption of nutrients (as well as avoiding diarrhea). Yes, you heard right: getting enough of the right kind of fiber helps you avoid diarrhea.
- Insoluble fiber does not dissolve (how shocking) in water and thus mostly passes through undigested by us (some will actually be digested by gut microbes who subsist on this, and in return for us feeding them daily, they make useful chemicals for us). This kind of fiber is also critical for healthy bowel movements, because without it, constipation can ensue.
Both kinds of fiber improve just about every metric related to blood, including improving triglycerides and improving insulin sensitivity and blood glucose levels. Thus, they help guard against various kinds of cardiovascular disease, diabetes, and metabolic disease in general. Do note that because whatever’s good for your heart/blood is good for your brain (which requires a healthy heart and bloodstream to nourish it and take away waste), likely this also has a knock-on effect against cognitive decline, but we don’t have hard science for that claim so we’re going to leave that last item as a “likely”.
However, one thing’s for sure: if you want a healthy gut, heart, and brain, you need a good balance of soluble and insoluble fibers.
10 of the best for soluble fiber
| Food | Soluble Fiber Type(s) | Soluble Fiber (g per serving) | Insoluble Fiber Type(s) | Insoluble Fiber (g per serving) | Total Fiber (g per serving) |
|---|---|---|---|---|---|
| Kidney beans (1 cup cooked) | Pectin, Resistant Starch | 1.5–2 | Hemicellulose, Cellulose | 6 | 8 |
| Lentils (1 cup cooked) | Pectin, Resistant Starch | 1.5–2 | Cellulose | 6 | 7.5 |
| Barley (1 cup cooked) | Beta-glucan | 3–4 | Hemicellulose | 2 | 6 |
| Brussels sprouts (1 cup cooked) | Pectin | 1–1.5 | Cellulose, Hemicellulose | 2 | 3.5 |
| Oats (1 cup cooked) | Beta-glucan | 2–3 | Cellulose | 1 | 3 |
| Apples (1 medium) | Pectin | 1–2 | Cellulose, Hemicellulose | 2 | 3 |
| Carrots (1 cup raw) | Pectin | 1–1.5 | Cellulose, Hemicellulose | 2 | 3 |
| Citrus fruits (orange, 1 medium) | Pectin | 1–1.5 | Cellulose | 1 | 2.5 |
| Flaxseeds (2 tbsp) | Mucilage, Lignin | 1–1.5 | Cellulose | 1 | 2.5 |
| Psyllium husk (1 tbsp) | Mucilage | 3–4 | Trace amounts | 0 | 3–4 |
10 of the best for insoluble fiber
| Food | Soluble Fiber Type(s) | Soluble Fiber (g per serving) | Insoluble Fiber Type(s) | Insoluble Fiber (g per serving) | Total Fiber (g per serving) |
|---|---|---|---|---|---|
| Wheat bran (1 cup) | Trace amounts | 0 | Cellulose, Lignin | 6–8 | 6–8 |
| Black beans (1 cup cooked) | Pectin, Resistant Starch | 1.5 | Cellulose | 6 | 7.5 |
| Brown rice (1 cup cooked) | Trace amounts | 0.5 | Hemicellulose, Lignin | 2–3 | 2.5–3.5 |
| Popcorn (3 cups popped) | Trace amounts | 0.5 | Hemicellulose | 3 | 3.5 |
| Broccoli (1 cup cooked) | Pectin | 1 | Cellulose, Hemicellulose | 4 | 5 |
| Green beans (1 cup cooked) | Trace amounts | 0.5 | Cellulose, Hemicellulose | 3 | 3.5 |
| Sweet potatoes (1 cup cooked) | Pectin | 1–1.5 | Cellulose | 3 | 4.5 |
| Whole wheat bread (1 slice) | Trace amounts | 0.5 | Cellulose, Hemicellulose | 1 | 1.5 |
| Pears (1 medium) | Pectin | 1 | Cellulose, Hemicellulose | 4 | 5 |
| Almonds (1 oz) | Trace amounts | 0.5 | Cellulose, Hemicellulose | 2 | 2.5 |
10 of the best for a balance of both
| Food | Soluble Fiber Type(s) | Soluble Fiber (g per serving) | Insoluble Fiber Type(s) | Insoluble Fiber (g per serving) | Total Fiber (g per serving) |
|---|---|---|---|---|---|
| Raspberries (1 cup) | Pectin | 1 | Cellulose | 5 | 6 |
| Edamame (1 cup cooked) | Pectin | 1 | Cellulose | 5 | 6 |
| Chia seeds (2 tbsp) | Mucilage, Pectin | 2–3 | Lignin, Cellulose | 3 | 5.5 |
| Artichokes (1 medium) | Inulin | 1 | Cellulose, Hemicellulose | 5 | 6 |
| Avocado (1 medium) | Pectin | ~2 | Cellulose | 4 | 6 |
| Black beans (1 cup cooked) | Pectin, Resistant Starch | 1.5 | Cellulose | 6 | 7.5 |
| Quinoa (1 cup cooked) | Pectin, Saponins | 1 | Cellulose, Hemicellulose | 3 | 4 |
| Spinach (1 cup cooked) | Pectin | 0.5 | Cellulose, Lignin | 3 | 3.5 |
| Prunes (1/2 cup) | Pectin, Sorbitol | 2 | Cellulose | 4 | 6 |
| Figs (3 medium) | Pectin | 1 | Cellulose | 2 | 3 |
You’ll notice that the above “balance” is not equal; that’s ok; we need greater quantities of insoluble than soluble anyway, so it is as well that nature provides such.
This is the same kind of balance when we talk about “balanced hormones” (does not mean all hormones are in equal amounts; means they are in the right proportions) or “balanced microbiome” (does not mean that pathogens and friendly bacteria are in equal numbers), etc.
Some notes on the above:
About those fiber types, some of the most important soluble ones to aim for are:
- Beta-glucan: found in oats and barley, it supports heart health.
- Pectin: found in fruits like apples, citrus, and pears, it helps with cholesterol control.
- Inulin: a type of prebiotic fiber found in artichokes.
- Lignin: found in seeds and wheat bran, it has antioxidant properties.
- Resistant starch: found in beans and lentils, it acts as a prebiotic for gut health.
See also: When Is A Fiber Not A Fiber? The Food Additive You Do Want
One fiber to rule them all
Well, not entirely (we still need the others) but there is a best all-rounder:
The Best Kind Of Fiber For Overall Health?
Enjoy!
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Future-Proof Your Brain
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This is Kimberly Wilson. She’s a psychologist, not a doctor, and/but her speciality is neurophysiology and brain health.
Here’s what she wants us to know…
Avoid this very common killer
As you’re probably aware, the #1 killer in the US is heart disease, followed by COVID, which effectively pushed everything down a place. Thereafter, we see cancer, followed by accidental injuries, stroke, and dementia (including Alzheimer’s).
Over in the UK, where Wilson is from, dementia (including Alzheimer’s disease) is the #1 killer, followed by heart disease and then respiratory diseases (including COVID), and then stroke, then cancer.
As ever, what’s good for the heart is good for the brain, so many of the same interventions will help avoid both. With regard to some of the other differences in order, the reasons are mostly due to differences in the two countries’ healthcare systems and firearms laws.
It’s worth noting, though, that the leading cause of death in young people (aged 15–19) is suicide in the UK; in the US it’s nominally accidental injuries first (e.g. accidental shootings) with intentional suicide in the second spot.
In other words… Young or old, mental health is a serious health category that kills literally the most people in the UK, and also makes the top spots in the US.
Avoid the early killer
Given the demographics of most of our readership, chances are you’ve already lived past your teens and twenties. That’s not to say that suicide is no longer a risk, though, and it’s also worth noting that while mental health issues are invisible, they’re still physical illnesses (the brain is also an organ, after all!), so this isn’t something where you can simply “decide not to” and that’s you set, safe for life. So, please do continue to take good care in that regard.
We wrote about this previously, here:
How To Stay Alive (When You Really Don’t Want To)
Avoid the later killer
Wilson talks about how a recent survey found that…
- while nearly half of adults say dementia is the disease they fear most,
- only a third of those thought you could do anything to avoid it, and
- just 1% could name the 7 known risk factors.
Quick test: can you name the 7 known risk factors?
Please take a moment to actually try (this kind of mental stimulation is good in any case), and count them out on your fingers (or write them down), and then…
When you’re ready: click here to see the answer!
How many did you get? If you got them all, well done. If not, then well, now you know, so that’s good.
So, with those 7 things in mind, the first obvious advice is to take care of those things.
Taking an evidence-based medicine approach, Wilson recommends some specific interventions that will each improve one or more of those things, directly or indirectly:
Eating right
Wilson is a big fan of “nutritional psychiatry” and feeding one’s brain properly. We wrote about this, here:
The 6 Pillars Of Nutritional Psychiatry
As well as agreeing with the obvious “eat plenty of fiber, different-colored plants, and plenty of greens and beans”, Wilson specifically also champions getting enough of vitamins B9, B12, and D, as well as getting a healthy dose of omega-3 fatty acids.
She also recommends intermittent fasting, if that’s a reasonable option for you—but advocates for not worrying about it, if it’s not easy for you. For example, if you are diabetic, or have (or have a history with) some kind of eating disorder(s), then it’s probably not usefully practicable. But for most people, it can reduce systemic inflammation, which means also reducing neuroinflammation.
Managing stress right
Here she advocates for three main things:
- Mindful meditation (see: Evidence-Based, No-Frills Mindfulness)
- Psychological resilience (see: Building Psychological Resilience)
- Mindful social media use (see: Making Social Media Work For Your Mental Health)
Managing money right
Not often we talk about this in a health science publication as opposed to a financial planning publication, but the fact is that a lot of mental distress, which goes on to have a huge impact on the brain, is rooted in financial stresses.
And, of course, it’s good to be able to draw on financial resources to directly fund one’s good health, but that is the secondary consideration here—the financial stress is the biggest issue, and you can’t CBT your way out of debt, for example.
Therapists often face this, and what has been referred to informally by professionals in the field as “Shit Life Syndrome”—and there’s only so much that therapy can do about that.
We’re not a financial publication, but one recommendation we’ll drop is that if you don’t currently have budgeting software that you use, this writer personally uses and swears by YNAB (You Need A Budget), so maybe check that out if you don’t already have everything covered in that regard. It’s not free, but there is a 34-day free trial.
Therapy can be very worthwhile nonetheless
Wilson notes that therapy is like non-invasive brain surgery (because of neuroplasticity, it’s literally changing physical things in your brain).
It’s not a magic bullet and it’s not the right choice for everyone, but it’s worth considering, and even self-therapy can yield benefits for many:
The Gym For Your Mental Health: Getting The Most Out Of Therapy
Sleeping right
Sleep is not only critical for health in general and brain health in particular, it’s also most of when our glymphatic system does clean-up in the brain (essential for avoiding Alzheimer’s & Parkinson’s, amongst other diseases):
How To Clean Your Brain (Glymphatic Health Primer)
Want to know more from Kimberley Wilson?
We reviewed a book of hers recently, here:
Unprocessed: What your Diet Is Doing To Your Brain – by Kimberley Wilson
However, much of what we shared today was sourced from another book of hers that we haven’t reviewed yet but probably will do one of these days:
Enjoy!
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Statins: Study Insights
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It’s Q&A Day at 10almonds!
Q: Can you let us know about more studies that have been done on statins? Are they really worth taking?
That is a great question! We imagine it might have been our recent book recommendation that prompted it? It’s quite a broad question though, so we’ll do that as a main feature in the near future!
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Good to Go – by Christie Aschwanden
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Many of us may more often need to recover from a day of moving furniture than running a marathon, but the science of recovery can still teach us a lot. The author, herself an endurance athlete and much-decorated science journalist, sets out to do just that.
She explores a lot of recovery methods, and examines whether the science actually backs them up, and if so, to what degree. She also, in true science journalism style, talks to a lot of professionals ranging from fellow athletes to fellow scientists, to get their input too—she is nothing if not thorough, and this is certainly not a book of one person’s opinion with something to sell.
Indeed, on the contrary, her findings show that some of the best recovery methods are the cheapest, or even free. She also looks at the psychological aspect though, and why many people are likely to continue with things that objectively do not work better than placebo.
The style is very easy-reading jargon-free pop-science, while nevertheless being backed up with hundreds of studies cited in the bibliography—a perfect balance of readability and reliability.
Bottom line: for those who wish to be better informed about how to recover quickly and easily, this book is a treasure trove of information well-presented.
Click here to check out Good To Go, and always be good to go!
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Lose Weight (Healthily!)
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What Do You Have To Lose?
For something that’s a very commonly sought-after thing, we’ve not yet done a main feature specifically about how to lose weight, so we’re going to do that today, and make it part of a three-part series about changing one’s weight:
- Losing weight (specifically, losing fat)
- Gaining weight (specifically, gaining muscle)
- Gaining weight (specifically, gaining fat)
And yes, that last one is something that some people want/need to do (healthily!), and want/need help with that.
There will be, however, no need for a “losing muscle” article, because (even though sometimes a person might have some reason to want to do this), it’s really just a case of “those things we said for gaining muscle? Don’t do those and the muscle will atrophy naturally”.
One reason we’ve not covered this before is because the association between weight loss and good health is not nearly so strong as the weight loss industry would have you believe:
And, while BMI is not a useful measure of health in general, it’s worth noting that over the age of 65, a BMI of 27 (which is in the high end of “overweight”, without being obese) is associated with the lowest all-cause mortality:
BMI and all-cause mortality in older adults: a meta-analysis
Important: the above does mean that for very many of our readers, weight loss would not actually be healthy.
Today’s article is intended as a guide only for those who are sure that weight loss is the correct path forward. If in doubt, please talk to your doctor.
With that in mind…
Start in the kitchen
You will not be able to exercise well if your body is malnourished.
Counterintuitively, malnourishment and obesity often go hand-in-hand, partly for this reason.
Important: it’s not the calories in your food; it’s the food in your calories
See also: Mythbusting Calories
The kind of diet that most readily produces unhealthy overweight, the diet that nutritional scientists often call the “Standard American Diet”, or “SAD” for short, is high on calories but low on nutrients.
So you will want to flip this, and focus on enjoying nutrient-dense whole foods.
The Mediterranean Diet is the current “gold standard” in this regard, so for your interest we offer:
Four Ways To Upgrade The Mediterranean Diet
And since you may be wondering:
Should You Go Light Or Heavy On Carbs?
The dining room is the next most important place
Many people do not appreciate food enough for good health. The trick here is, having prepared a nice meal, to actually take the time to enjoy it.
It can be tempting when hungry (or just plain busy) to want to wolf down dinner in 47 seconds, but that is the metabolic equivalent of “oh no, our campfire needs more fuel, let’s spray it with a gallon of gasoline”.
To counter this, here’s the very good advice of Dr. Rupy Aujla, “The Kitchen Doctor”:
Interoception & Mindful Eating
The bedroom is important too
You snooze, you lose… Visceral belly fat, anyway! We’ve talked before about how waist circumference is a better indicator of metabolic health than BMI, and in our article about trimming that down, we covered how good sleep is critical for one’s waistline:
Visceral Belly Fat & How To Lose It
Exercise, yes! But in one important way.
There are various types of exercise that are good for various kinds of health, but there’s only one type of exercise that is good for boosting one’s metabolism.
Whereas most kinds of exercise will raise one’s metabolism while exercising, and then lower it afterwards (to below its previous metabolic base rate!) to compensate, high-intensity interval training (HIIT) will raise your metabolism while training, and for two hours afterwards:
…which means that unlike most kinds of exercise, HIIT actually works for fat loss:
So if you’d like to take up HIIT, here’s how:
How (And Why) To Do HIIT (Without Wrecking Your Body)
Want more?
Check out our previous article about specifically how to…
Burn! How To Boost Your Metabolism
Take care!
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Pineapple vs Passion Fruit – Which is Healthier?
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Our Verdict
When comparing pineapple to passion fruit, we picked the passion fruit.
Why?
Both are certainly great, and both have won their respective previous comparisons! And this one’s close:
In terms of macros, passion fruit has about 4x the protein, nearly 2x the carbs, and more than 7x the fiber. So, this one’s a clear and overwhelming win for passion fruit.
Vitamins are quite close; pineapple has more of vitamins B1, B5, B6, B9, and C, while passion fruit has more of vitamins A, B2, B3, and choline. So, a 5:4 marginal win for pineapple.
When it comes to minerals, pineapple has more calcium, copper, manganese, and zinc, while passion fruit has more iron, manganese, phosphorus, potassium, and selenium. Superficially, this would be a 5:5 tie, but looking at the numbers, passion fruit’s margins of difference are much greater, which means it gives the better overall mineral coverage, and thus wins the category.
Looking at polyphenols, pineapple wins this category with its variety of lignans, while passion fruit has just secoisolariciresinol, of which pineapple has more anyway. Plus, not a polyphenol but doing much of the same job of same, pineapple has bromelain, which is unique to it. So pineapple wins on the phytochemicals reckoning.
Adding up the sections and weighting them for importance (e.g. what a difference it makes to health) and statistical relevance (e.g. greater or smaller margins of difference) makes for a nominal passion fruit win, but like we say, both of these fruits are great, so enjoy both!
Want to learn more?
You might like to read:
Bromelain vs Inflammation & Much More
Take care!
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Green Coffee Bean Extract: Coffee Benefits Without The Coffee?
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Coffee is, on balance, very good for the health in moderation. We wrote about it here:
The Bitter Truth About Coffee (or is it?)
Some quick facts before moving on:
- Coffee is the world’s biggest source of antioxidants
- 65% reduced risk of Alzheimer’s for coffee-drinkers
- 67% reduced risk of type 2 diabetes for coffee-drinkers
- 43% reduced risk of liver cancer for coffee-drinkers
- 53% reduced suicide risk for coffee-drinkers
Those are some compelling statistics!
But what about the caffeine content?
Assuming one doesn’t have a caffeine sensitivity, caffeine is also healthy in moderation—but it is easy to accidentally become dependent on it, so it can be good to take a “tolerance break” once in a while, and then reintroduce it with more modest moderation:
Caffeine: Cognitive Enhancer Or Brain-Wrecker?
We also, for that matter, have discussed its impact on the gut:
Coffee & Your Gut ← surprise, it’s a positive impact
What if I don’t like coffee?
We suspect that, having seen the title of this article, you know what the answer’s going to be here:
Green coffee bean extract is the extract from green (i.e. unroasted) coffee beans. It has one or two advantages over drinking coffee:
- For those who do not like drinking coffee, this supplement sidesteps that neatly
- Roasting coffee beans destroys a lot (sometimes almost all; it depends on the temperature and duration) of their chlorogenic acid, a highly beneficial polyphenol; using unroasted (i.e. green) coffee beans avoids that
See: Role of roasting conditions in the level of chlorogenic acid content in coffee beans
All about GCE and CGA
That’s “green coffee extract” and “chlorogenic acid”, respectively, bearing in mind that the latter is found generously in the former.
As to what it does:
❝CGA is an important and biologically active dietary polyphenol, playing several important and therapeutic roles such as antioxidant activity, antibacterial, hepatoprotective, cardioprotective, anti-inflammatory, antipyretic, neuroprotective, anti-obesity, antiviral, anti-microbial, anti-hypertension, free radicals scavenger and a central nervous system (CNS) stimulator. Furthermore, CGA causes hepatoprotective effects.❞
👆 Those are the things we know for sure that it does. And it may do even more things:
❝In addition, it has been found that CGA could modulate lipid metabolism and glucose in both genetically and healthy metabolic related disorders. It is speculated that CGA can perform crucial roles in lipid and glucose metabolism regulation and thus help to treat many disorders such as hepatic steatosis, cardiovascular disease, diabetes, and obesity as well.❞
Read in full: Chlorogenic acid (CGA): A pharmacological review and call for further research
About lipid metabolism…
- Green coffee extract supplementation significantly reduces serum total cholesterol levels.
- Green coffee extract supplementation significantly reduces serum LDL (“bad” cholesterol) levels.
- Increases in HDL (“good” cholesterol) after green coffee bean extract consumption are significant in green coffee bean extract dosages ≥400mg/day.
About blood glucose and insulin…
- Green coffee extract supplementation significantly improved fasting blood sugar levels
- Green coffee extract supplementation at ≥400 mg/day significantly lowered postprandial insulin levels (that’s good)
Want to try some?
We don’t sell it, but here for your convenience is an example product on Amazon 😎
Enjoy!
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