Meaning of starch

Meaning of starch enables us to better understand the pros and cons of carbohydrate.

Nowhere in the world of menu planning is there more confusion than about the role starches play in the growing obesity of the Western world. Many say you must avoid them in totality, others that in moderation they are fine, and some are saying that it is only the simple-carbohydrates that are problematic.

New potatoes.

It is based largely on opinion, rather than scientific fact, and is usually grossly oversimplifying a very complex subject. What has to be faced though, with urgency, is that the predicted diabetes epidemic in developing countries is happening as expected. For example, in South Africa, amongst a random sample of Coloured people in the Cape, a massive 28pc have T2D[5]; nearly a third of adults. And that was in 2012/

And amongst those of Indian descent it is even higher.

So what is the meaning of starch?

A starch molecule consists of a large chain of glucose molecules joined together; there are two types. Fully digested, both of them produce a ton of sugars.

  • 25% consists of a long chain of glucose units which is unbranched, but curls itself into a helical shape, making it difficult to digest; it's called amylose.
  • 75% on the other hand is amylopectin consisting of a very large number of glucose units, up to hundreds of thousands, that are highly branched; this means they are easily digested in the small intestine by the enzyme amylase.

The ratio of amylose to amylopectin varies in different carbohydrates, but typically is about 1 part to 4; in other words the greater part is the problematic starch.

Braised new potatoes are for us all with their crispy crusts and soft centres. They are hard to get, and quite different to those coming out of cold storage; yes, it is complicated.

This page was last updated by Dr Bernard Preston on 9th April, 2021.

Braised new potatoes.

Long chains of glucose molecules are called polysaccharides; it is how plants store the energy they collect from the sun, and are the chief source of energy for humans who eat plants.

Starches are typically found in potatoes and corn, for example, but also in fruit like apples, and in legumes; they are everywhere in virtually all foods.

Remember that amylose, the one quarter fraction, is difficult to digest and is known as 'resistant starch'. It passes through to the large intestine where it's not easily broken down by enzymes that would normally form glucose, but fermented by the normal flora producing excellent short chain fatty acids like butyrate. This compound is an important marker of a happy colon; if it is only found in small quantities, then all sorts of unhappiness occurs in the body. There is a sharp rise in the autoimmune diseases like lupus and rheumatoid arthritis.

Put differently feeding the microbiota in the colon is important; if all the starch is digested in the small intestine leaving none for the bugs, they starve and our bowels and overall well-being suffers.

So are you getting some understanding of the meaning of starch?

Perhaps you are wondering, why on earth is a DC writing blogs all about starch. Well, all sound practitioners have a responsibility for the overall well-being of their patients, and not just the subluxations in their spines, caries in teeth, and pathogens in the sinuses or bladders.

What we eat and whether we exercise, probably will have a more profound influence on how long we live, and the quality of that life, than these other lesser important criteria.

So to summarise, amylose or resistant starch, because of the helical nature of the molecule, is not well digested by the enzymes in the small intestine and tends to reach the colon, where it is termed a prebiotic.

Amylopectin on the other hand is highly branched, and rapidly digested and absorbed in the small intestine, giving a blood sugar rush, outpouring of insulin, and then stored in adipose tissue.

Obesity in man.

In acknowledgement of the Nutrition Network for this slide; it reveals how within 28 years of the McGovern guidelines being introduced, changing our food to refined starches rich in amylopectin, and the simple sugars such as in colas, cakes and cookies, we became so obese.

Meaning of starch

Meaning of starch will enable you to grasp which of the carbohydrates, and how they are prepared, will make you fat.

So we should be looking for those carbohydrates that are slowly digested in the small intestine, forming minimal amounts of glucose which is rapidly absorbed, so that most of the starch reaches the colon where it is fermented rather by the bugs known as our normal flora.


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How that carbohydrate is prepared in the kitchen has a profound effect on the way it is digested.

Let us start by considering potatoes, a staple in most of our meals. If you deep fry them, they have an extremely high glycemic index; they are very rapidly digested and absorbed in the small intestine.

Likewise though to a lesser extent, the same is true of boiled potatoes and mash. That is not a good idea and, if eaten every day, will make you obese and set you on the road to weight gain and insulin resistance. That is particularly true of the russets.

Instead enjoy rather red and new potatoes that form a creamy, smooth mash; they have a greater proportion of resistant starch and are more likely to reach the colon undigested. Are you beginning to grasp the meaning of starch?

Diabetics thus can often enjoy new potatoes that cause only the normal postprandial rise in blood sugar; two hours later their finger pricks are normal. Test yourself though to be sure.

They tend to be expensive and one is never sure just how new they are; the best solution is to learn how to plant potatoes.

Allowing starches to cool overnight in the refrigerator, and then reheat the next day is the better way to do it; it takes some planning, but the starch undergoes retrogradation making it yet more difficult for the enzymes to digest in the small intestine.

Chilling and then reheating resistant starch is a good way to feed those bugs in the colon, and save you from the obesity often associated with carbs.

Of course all the resistant starch in Idaho will be quite useless if the microbiota is seriously depleted as is very common in those on the Western way of eating. Enjoying these kefir benefits every day changes everything; it is so easy to make at home. The bacteria and yeast probiotics will do a wonder for your colon.

Vichyssoise, the way the French would enjoy our Irish potato leek soup, employs this principle of retrogradation; they enjoy it cold. An alternative, perhaps even better, would be to cool it overnight and then reheat it the next day for a meal.

Many starches like brown rice for example, are far more palatable if allowed to cool and then reheated later.

Low GI bread

Bread machine with a loaf.

Through what I can only describe as wicked, fake reporting, millers are allowed to describe their flour as 'wholemeal' provided they remove less than 40 percent of the germ and bran. Thus you will read that wholegrain bread has a high glycemic index; and so it does, if you buy it from the supermarket. You should avoid it.

This kind of false reporting only serves to confuse us when trying to grasp the meaning of starch. After all, surely wholegrain bread should be low GI; and so it is if you use real 100 percent wholegrain meal.

There is a revolution happening in the world of baking, demanding real bread that is made from 100% wholemeal. Frankly it is still very difficult to find and you certainly will not discover it in the local supermarket.

You may be lucky to have a specialist baker in the district, but most likely you will have to bake your own low GI bread; it means having a wheat grinder. The upside is that it takes only five minutes to prepare, tastes divine, costs a fraction of the price of the local artisan bread and, considering the meaning of starch, is very resistant to digestion in the small intestine and certainly will not make you obese.

Personally, I bake our low GI bread most days; it really only takes five minutes including the grinding of the 100 percent wholemeal flour, and tastes absolutely divine.

Whilst previously, eating so-called whole grain bread, I found it necessary to use various jellies, knowing well that the sugar did me no good, or hams and polonies fully understanding that processed meat means a high likelihood of tumours.

Or peanut butter with the possibility of aflatoxin; commercial bread tastes utterly boring unless it is dickered up.

Now our own low GI bread, and even more our what is artisan bread which tastes so divine that I rarely add anything more than butter; it simply needs nothing else to make my fussy tongue happy.

Understanding about the carbohydrate count chart is important too, and will you help your understanding.

Corn on the cob

Corn on the cob.

I am yet to find out exactly the meaning of starch concerning fresh corn on the cob but I presume that like new potatoes the amount of resistant starch is significantly higher if you pick them young; despite enjoying it daily for three months in the year, straight from the garden, neither the good wife nor I have put on a pound. In fact we have lost a few.

Straight from the garden you can enjoy a mealie a day.

Once your starches have sat in cold storage, or at the green grocer for a few days, it appears that not only does the taste regress, but less of the starch passes safely through the small intestine undigested, meaning a rise in blood sugar and the threat of insulin resistance.

Meal plans like the Paleo and Banting assume that you will not be able to enjoy fresh corn on the cob, new potatoes, or 100-percent whole grain bread; for the majority that could be true. But once you understand the meaning of starch, you no longer need to live in terror of enjoying unrefined whole carbohydrate.

If we want to enjoy our carbs without a consequent increase in our waistlines, then we either have to grow them ourselves, or frequent the farmers' markets for fresh veggies, and bake our own bread. There is no other way.

Obviously I am recommending how to grow corn.You have to keep the chickens out when the plants are small.

The first signs of corn in flower is a day of rejoicing in our household.

Unfortunately, if you are banting or on the paleo plan, this quick succotash recipe is out of the question; both the corn and lima beans have starch. Nevertheless, depending on which variety of maize you are using, both have a low glycemic-index; neither are fattening as they have largely resistant starch. Do limit the load by having smaller amounts. 

So why were cornflakes invented?

Maize meal

Whereas white-maize on the cob has a low glycemic index, once ground and refined the way South Africans love it as pap, the GI rises dramatically to 83 which is very high.

Even unrefined maize meal enjoyed hot has a high glycemic index of 71; thus it should be cooked the night before, cooled and allowed to retrograde.

However there is wide divergence of the reported GI of maize meal. Du Plessis et al for example report that the figure is only 39 - 50[6].

Currently this is a subject I am pursuing, since I love freshly-ground mealie meal porridge, and will test myself on the postprandial glycemic response.

How do "net carbs" work is the next subject under discussion; it's all about the fibre, or lack thereof.

Oats muesli or porridge

Oats is another grain that is often refined to remove the fibre, vitamins and other important phytochemicals like ferulic that food companies want to refine out and sell back to us as supplements.

Look for the whole rolled grain and expect to cook it for longer; these Quaker oats recipes will give you some ideas; we have one of them every single day for the satiety they bring and their powerful ability to lower blood cholesterol. Then you can enjoy butter without guilt.

Again cook extra porridge, cool it overnight and reheat the next day, allowing the starches to retrograde. We now like to make this steel-cut oats recipe for breakfast; there are two mystery ingredients that help reduce any surge in blood sugar.

Luckily margarine is out and butter is back.

Oats milk

Oats milk being blended prior to filtering.

Making an oats milk extract as an alternative to dairy is extremely simple and you can do it in your own kitchen in less than five minutes, though it should stand for another ten before straining. At R2.20 per litre, a mere pittance in dollars or pounds it makes no sense to go out and buy it.

The stick blender ranks in my top five favourite kitchen appliances. I wouldn't be without it.


Consumption of whole grains like brown unpolished rice has been strongly linked to a lower incidence of cardiovascular disease.

However, enjoying white rice has exactly the opposite effect. Data from the new PURE study published in the American Journal Diabetes Care shows there is a strong association between the refined grain and type 2 diabetes[4].

The strength of this study is the huge number of participants living in 21 different countries. The conclusion of the authors is that we should:

  1. Change to unpolished brown rice.
  2. Add pulses and legumes to our meals; the protein and fibre lowers the glycemic load of the rice.

Really it is astonishing that the world eats so much white rice; it is from the study of its effect on well-being that led directly to the discovery of the first vitamin, thiamine. A deficiency causes the very serious disease beriberi.

Okinawa is one of the five blue zones of the world, but the wellness of the people there has taken a dive since changing from traditional sweet-potatoes to white rice as their source of starch.

Read more about the importance of thiamine by typing "generalised muscle weakness" into the site search function in the navigation bar above.

Glycemic response to starch in legumes

Legumes like chickpeas, beans and lentils whilst being the main source of protein for most of the people of the world, also have a lot of starch. For this reason they are banned from the menus of those following the paleo or banting plans; erroneously so, I believe. Once you understand the meaning of starch, you will understand why.

The reason is that most, with the exception of fava beans, have a very low glycemic response to legumes; they have a higher proportion of amylose, the resistant starch, and a lot of fibre.

Favas only have a higher GI because they are usually eaten skinned because they are almost impossible to get, fresh, young and tender. There are no figures for the whole beans, but I'm certain they are low too.

Also, adding protein to a starch, lowers the glycemic index; it is built in to the legumes.

All told legumes are not a threat to the waistlines of those seeking to lose weight. They simply do not produce an abnormal postprandial rise in blood sugar; they are not fattening. Instead, knowing about resistant starch, and avoiding the easy carbs in the main is the way forward.

The other obvious response to those advocating these low carb plans is that they must then get their protein from an animal source; it is neither affordable for the majority, nor is it sensible. You will more likely die of a tumour instead; an even worse story than sudden death from a fatal heart attack. 

Weight loss

In short, understanding the meaning of starch means we have a much better opportunity of achieving meaningful weight loss in a helpful way.

Legumes, real bread and freshly picked starchy foods from the garden are not the cause of obesity. We know what is; those carbohydrates that are rapidly digested in the small intestine causing a surge in blood sugar, outpouring of insulin and deposition in the adipose tissue and then the liver.

The first step to losing weight permanently in a nutritious, sane way, is to forget the word diet; permanently. Eradicate it from your vocabulary and thinking; it is a dirty four-letter word, because none of them work.

Understanding the meaning of starch and its role in the wellness menu, searching out for the real, slow food that our great grandparents ate is the way to a modest waistline.

What are the ketogenic diets and why are they so controversial?


So, what is your BMI? This will tell you how important it is to get started on this journey.

Are you in the dark green? Misery lies ahead if you do not do something soon; pain, pills and disability. Start today by purchasing some seeds for the garden, buy a packet of dried chickpeas for making your own hummus, see the navigation bar above for a delicious recipe, and find a local farmers' market.

Good luck, it can be done.

Authentic hummus recipe.

Our delicious, low GI hummus recipe, or other legumes, 100-percent real bread and fresh vegetables and fruit straight from the garden or greengrocer is the way I recommend to lose weight.

There is interesting research that shows that cumin plus lime, two of the main ingredients in hummus, are more effective than a common weight-loss drug.

It is sustainable, nutritious and absolutely scrumptious; banting the modified way if you insist on a menu plan, is reasonable. Better still, just grasp the meaning of starch and follow your own inner sense; those nasty menu plans just do not work; only 5 percent of people one year later have actually lost weight, and many have put on. 

Let me say it again, it's a dirty four letter word. Rather look to this glycemic index calculator to decide which foods are making you fat, and which are kosher.

Find the links to those topics highlighted in bold by copying and pasting into the Site Search function in the navigation bar on your left. 

Boiling vs baked

The way we prepare a starch has a profound effect on the way it is absorbed in the alimentary canal. For example, if you have been planting sweet potatoes you will probably be astonished, as I was, to discover that both the glycemic load and the index are dramatically different when comparing boiling vs baked.

Nutrition is a complex subject, and I hope this contributes to your understanding of the meaning of starch.

It is sad perhaps, but a fact, that baked sweet potatoes have a very high glycemic index of 94; they are absorbed in the small intestine and instantly raise the blood-sugar. That makes them very fattening. 

But a boiled sweet potato, as in our butternut soup recipe, has a low GI of 44; that makes it a very good starch that is not in the slightest fattening. Much of it passes through the small intestine undigested, and instead feeds the microbiota in the colon producing excellent short-chain fatty acids instead of glucose; it does not add to the girth and also gives protection against the neurodegenerative conditions like Parkinson's disease.

Boil your starches, do not bake or roast them if you care more about being hale and hearty than the dictates of your tongue.

And better still, after cooking refrigerate them overnight and reheat them before enjoying them, so that retrogradation can occur.

Understanding these matters is what better wellness is all about; grasping why simple carbohydrates are not all bad, and complex starches are not all good, is part of it.

You can read more about this anathema at simple vs complex carbohydrate.

Carbohydrate resistant

Jack Sprat and his wife Noleen enjoyed exactly the same food but, despite together licking the platter clean, he was thin as a rake, and she was two-yards around the midriff. How can that be?

Noleen's liver and muscles were unable to utilise blood sugar in the normal way; she is carbohydrate resistant. It is partly genetic, but also induced by a food high in refined starches; I suspect she had a sweet tooth, but Jack loves a spicy dish.

Probably as a child she was allowed unlimited candy and ice-cream, but Jack's mother said that he could only have them now and then.

There is only one solution; Noleen has to avoid all refined starch, and even whole carbs have to be taken in moderation.

The best test is the HbA1c. It should be below 5%. Currently there is no other known way of dealing with carbohydrate resistance; if Noleen refuses she will first become obese, then insulin-resistant and finally diabetic. Then her toes will start to fall off, she will go blind and drop off the planet long before her time from a heart attack or stroke; not pleasant and quite unnecessary.

Actually, it is a blessing now that she understands the meaning of starch; she will be far more hale and hearty for avoiding sugar and cake flour, and getting to know about the natural carbohydrates and joining those doing a victory dance when she sees the first corn or potatoes in flower. She can enjoy them fresh from the garden in moderation.

Also important for Noleen is something very simple that could make a big change to her levels of energy and tendency towards raised serum glucose; she should start daily adding a little cinnamon in her cooking. Strong research shows that it improves insulin sensitivity making her cells to take up circulating sugars more easily.

Cinnamon and diabetes, and in fact other spices such as turmeric, are huge subjects all on their own.


The food--plans that limit calories just don't work because they simply are not sustainable; worse, many of them leave you constantly famished. The secret is to strictly limit all refined-starches, but ironically add a little extra fat; the good ones like avocado, olives and coconut oil.

You will read a lot of different opinions which have confused the best of us. Don't give up weight loss and reducing your naughty starches. The Awesome Chef has many good ideas for you, whether you eat meat or not; how to sustain a low-carb vegetarian plan.

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Beer of course contains a lot of starch; 26g of alcohol and maltose to be more precise. That is more carbohydrate than a diabetic should have in the whole day.

But what about the rest of us, whose weight is good, lifestyle wholesome and get plenty of exercise? I set out to measure my glycemic response to beer; your body will of course react differently, and if you have a weight problem, suspect you may be prediabetic as I am, and want to live into your eighties, then I recommend you get a glucometer and test yourself.

My most significant discovery is that if I take a short ten minute walk after a starchy meal, it will completely stop a surge in blood glucose; but if I sit down at the computer after lunch, it rises to unacceptable heights.

Turmeric extract

In an interesting article1 in the journal of the American Diabetic Association, in a strong study on 200 prediabetic patients, researchers found that not one of the group taking a turmeric extract became fully type 2 diabetic.

Having said that, South African Indians have one of the highest rates of diabetes and heart disease in the world despite enjoying turmeric regularly; refined starch is the main problem. If you do not grasp the meaning of that, all the tea in China will not keep disease at bay.

However, of those in the placebo group, 16.4% did become full blown diabetics within 9 months.

Moreover tests on the beta cells in the pancreas that produce insulin showed better overall function and less inflammation.

In fact studies on rats show that even in T1DM those beta cells may recover with curcumin, the active ingredient in turmeric.

Useful links

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  1. Curcumin Extract for Prevention of Type 2 Diabetes
  2. 100% flour
  3. Cooking chickpeas
  4. Excess white rice intake linked to new onset of Type 2 Diabetes
  5. High prevalence of diabetes mellitus and metabolic syndrome in a South African coloured population
  6. African maize porridge: A food with slow in vitro starch digestibility

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