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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Cost of living: if you can’t afford as much fresh produce, are canned veggies or frozen fruit just as good?
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The cost of living crisis is affecting how we spend our money. For many people, this means tightening the budget on the weekly supermarket shop.
One victim may be fresh fruit and vegetables. Data from the Australian Bureau of Statistics (ABS) suggests Australians were consuming fewer fruit and vegetables in 2022–23 than the year before.
The cost of living is likely compounding a problem that exists already – on the whole, Australians don’t eat enough fruit and vegetables. Australian dietary guidelines recommend people aged nine and older should consume two serves of fruit and five serves of vegetables each day for optimal health. But in 2022 the ABS reported only 4% of Australians met the recommendations for both fruit and vegetable consumption.
Fruit and vegetables are crucial for a healthy, balanced diet, providing a range of vitamins and minerals as well as fibre.
If you can’t afford as much fresh produce at the moment, there are other ways to ensure you still get the benefits of these food groups. You might even be able to increase your intake of fruit and vegetables.
New Africa/Shutterstock Frozen
Fresh produce is often touted as being the most nutritious (think of the old adage “fresh is best”). But this is not necessarily true.
Nutrients can decline in transit from the paddock to your kitchen, and while the produce is stored in your fridge. Frozen vegetables may actually be higher in some nutrients such as vitamin C and E as they are snap frozen very close to the time of harvest. Variations in transport and storage can affect this slightly.
Minerals such as calcium, iron and magnesium stay at similar levels in frozen produce compared to fresh.
Another advantage to frozen vegetables and fruit is the potential to reduce food waste, as you can use only what you need at the time.
Freezing preserves the nutritional quality of vegetables and increases their shelf life. Tohid Hashemkhani/Pexels As well as buying frozen fruit and vegetables from the supermarket, you can freeze produce yourself at home if you have an oversupply from the garden, or when produce may be cheaper.
A quick blanching prior to freezing can improve the safety and quality of the produce. This is when food is briefly submerged in boiling water or steamed for a short time.
Frozen vegetables won’t be suitable for salads but can be eaten roasted or steamed and used for soups, stews, casseroles, curries, pies and quiches. Frozen fruits can be added to breakfast dishes (with cereal or youghurt) or used in cooking for fruit pies and cakes, for example.
Canned
Canned vegetables and fruit similarly often offer a cheaper alternative to fresh produce. They’re also very convenient to have on hand. The canning process is the preservation technique, so there’s no need to add any additional preservatives, including salt.
Due to the cooking process, levels of heat-sensitive nutrients such as vitamin C will decline a little compared to fresh produce. When you’re using canned vegetables in a hot dish, you can add them later in the cooking process to reduce the amount of nutrient loss.
To minimise waste, you can freeze the portion you don’t need.
Fermented
Fermented vegetables are another good option. Angela Khebou/Unsplash Fermentation has recently come into fashion, but it’s actually one of the oldest food processing and preservation techniques.
Fermentation largely retains the vitamins and minerals in fresh vegetables. But fermentation may also enhance the food’s nutritional profile by creating new nutrients and allowing existing ones to be absorbed more easily.
Further, fermented foods contain probiotics, which are beneficial for our gut microbiome.
5 other tips to get your fresh fix
Although alternatives to fresh such as canned or frozen fruit and vegetables are good substitutes, if you’re looking to get more fresh produce into your diet on a tight budget, here are some things you can do.
1. Buy in season
Based on supply and demand principles, buying local seasonal vegetables and fruit will always be cheaper than those that are imported out of season from other countries.
2. Don’t shun the ugly fruit and vegetables
Most supermarkets now sell “ugly” fruit and vegetables, that are not physically perfect in some way. This does not affect the levels of nutrients in them at all, or their taste.
Buying fruit and vegetables during the right season will be cheaper. August de Richelieu/Pexels 3. Reduce waste
On average, an Australian household throws out A$2,000–$2,500 worth of food every year. Fruit, vegetables and bagged salad are the three of the top five foods thrown out in our homes. So properly managing fresh produce could help you save money (and benefit the environment).
To minimise waste, plan your meals and shopping ahead of time. And if you don’t think you’re going to get to eat the fruit and vegetables you have before they go off, freeze them.
4. Swap and share
There are many websites and apps which offer the opportunity to swap or even pick up free fresh produce if people have more than they need. Some local councils are also encouraging swaps on their websites, so dig around and see what you can find in your local area.
5. Gardening
Regardless of how small your garden is you can always plant produce in pots. Herbs, rocket, cherry tomatoes, chillies and strawberries all grow well. In the long run, these will offset some of your cost on fresh produce.
Plus, when you have put the effort in to grow your own produce, you are less likely to waste it.
Evangeline Mantzioris, Program Director of Nutrition and Food Sciences, Accredited Practising Dietitian, University of South Australia
This article is republished from The Conversation under a Creative Commons license. Read the original article.
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Sometimes, Perfect Isn’t Practical!
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It’s Q&A Day at 10almonds!
Have a question or a request? We love to hear from you!
In cases where we’ve already covered something, we might link to what we wrote before, but will always be happy to revisit any of our topics again in the future too—there’s always more to say!
As ever: if the question/request can be answered briefly, we’ll do it here in our Q&A Thursday edition. If not, we’ll make a main feature of it shortly afterwards!
So, no question/request too big or small
❝10 AM breakfast is not realistic for most. What’s wrong with 8 AM and Evening me at 6. Don’t quite understand the differentiation.❞
(for reference, this is about our “Breakfasting For Health?” main feature)
It’s not terrible to do it the way you suggest It’s just not optimal, either, that’s all!
Breakfasting at 08:00 and then dining at 18:00 is ten hours apart, so no fasting benefits between those. Let’s say you take half an hour to eat dinner, then eat nothing again until breakfast, that’s 18:30 to 08:00, so that’s 13½ hours fasting. You’ll recall that fasting benefits start at 12 hours into the fast, so that means you’d only get 1½ hours of fasting benefits.
As for breakfasting at 08:00 regardless of intermittent fasting considerations, the reason for the conclusion of around 10:00 being optimal, is based on when our body is geared up to eat breakfast and get the most out of that, which the body can’t do immediately upon waking. So if you wake and get sunlight at 08:30, get a little moderate exercise, then by 10:00 your digestive system will be perfectly primed to get the most out of breakfast.
However! This is entirely based on you waking and getting sunlight at 08:30.
So, iff you wake and get sunlight at 06:30, then in that case, breakfasting at 08:00 would give the same benefits as described above. What’s important is the 1½ hour priming-time.
Writer’s note: our hope here is always to be informational, not prescriptive. Take what works for you; ignore what doesn’t fit your lifestyle.
I personally practice intermittent fasting for about 21hrs/day. I breakfast (often on nuts and perhaps a little salad) around 16:00, and dine at around 18:00ish, giving myself a little wiggleroom. I’m not religious about it and will slide it if necessary.
As you can see: that makes what is nominally my breakfast practically a pre-dinner snack, and I clearly ignore the “best to eat in the morning” rule because that’s not consistent with my desire to have a family dinner together in the evening while still practicing the level of fasting that I prefer.
Science is science, and that’s what we report here. How we apply it, however, is up to us all as individuals!
Enjoy!
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The Power of Hormones – by Dr. Max Nieuwdorp
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First a quick note on the author: he’s an MD & PhD, internist, endocrinologist, and professor. He knows his stuff.
There are a lot of books with “the new science of” in the title, and they don’t often pertain to science that is actually new, and in this case, for the most part the science contained within this book is quite well-established.
A strength of this book is that it’s not talking about hormones in just one specific aspect (e.g. menopause, pregnancy, etc) but rather, in the full span of human health, across the spectra of ages and sexes—and yes, also covering hormones that are not sex hormones, so for example also demystifying the different happiness-related neurotransmitters, as well as the hormones responsible for hunger and satiety, weight loss and gain, sleep and wakefulness, etc.
Which is all very good, because there’s a lot of overlap and several hormones fall into several categories there.
Moreover, the book covers how your personal cocktail of hormones impacts how you look, feel, behave, and more—there’s a lot about chronic health issues here too, and how to use the information in this book to if not outright cure, then at least ameliorate, many conditions.
Bottom line: this is an information-dense book with a lot of details great and small; if you read this, you’ll come away with a much better understanding of hormones than you had previously!
Click here to check out The Power of Hormones, and harness that power for yourself!
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Olive Oil vs Coconut Oil – Which is Healthier?
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Our Verdict
When comparing extra virgin olive oil to cold-pressed coconut oil, we picked the olive oil.
Why?
While the cold-pressed coconut oil may offer some health benefits due to its lauric acid content, its 80–90% saturated fat content isn’t great for most people. It’s a great oil when applied topically for healthy skin and hair, though!
The extra virgin olive oil has a much more uncontroversially healthy blend of triglycerides, and (in moderation) is universally recognized as very heart-healthy.
Your local supermarket, most likely, has a good extra virgin olive oil, but if you’d like to get some online, here’s an example product on Amazon for your convenience.
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Insomnia Decoded – by Dr. Audrey Porter
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We’ve written about sleep books before, so what makes this one different? Its major selling point is: most of the focus isn’t on the things that everyone already knows.
Yes, there’s a section on sleep hygiene and yes it’ll tell you to cut the caffeine and alcohol, but most of the advice here is beyond that.
Rather, it looks at finding out (if you don’t already know for sure) what is keeping you from healthy sleep, be it environmental, directly physical, or psychological, and breaking out of the stress-sleep cycle that often emerges from such.
The style is light and conversational, but includes plenty of science too; Dr. Porter knows her stuff.
Bottom line: if you feel like you know what you should be doing, but somehow life keeps conspiring to stop you from doing it, then this is the book that could help you break out that cycle.
Click here to check out Insomnia Decoded, and get regular healthy sleep!
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Longevity for the Lazy – by Dr. Richard Malish
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There are some people who devote all their resources to longevity, which can become a full-time occupation, not to mention a very expensive endeavor. This book’s for those who want to get the best possible “bang for buck” by doing the things that have the most favorable cost:worth ratio.
Dr. Malish covers what can be done easily for personal longevity, as well as what technological advances can be enjoyed that those before us didn’t have as options. He also discusses the diseases that are most likely to kill us, and how to avoid those.
He preaches a proactive approach, but one that is simple and consistent and based in good science, and good statistics. Indeed, while he’s served 20 years as an army doctor and a cardiologist, he now works as a healthcare policy consultant, so he is well-placed to advise.
The style of the book is halfway between regular pop-science and a textbook; you can either read it cover-to-cover, or skim first though the key points, highlight boxes, summaries, and the like. He also provides a time-phased task list, for those who like things to be laid out like that.
Bottom line: this is a very good, methodical guide to living longer without making it a full-time occupation.
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