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Succulent, tuberlous yacon roots, not to be confused with the turnip-like legume jicama in Ecuador, have been used as food and a medicine by local populations for centuries, but its popularity has spread beyond its native range with availability in urban markets only since the year 2000.
The primary modern interest in yacon is for use as an alternative sweetener particularly for diabetics or those trying to lose weight.
The yacon tubers from which yacon syrup is made look like sweet potatoes but taste sweet like a fruit. The dark syrup of medium thickness made from concentrating the juice of yacon roots is very rich and tastes like a cross between molasses and maple syrup. In addition, yacon syrup has an ultra low glycemic index which means that it is absorbed much more slowly than other sweeteners which prevents a sudden insulin spike.
Below is a list of some of the most popular sweeteners in the healthfood community with their corresponding glycemic index. The lower the number, the less pronounced the insulin spike when consumed.
Stevia extract 0
Monk fruit extract
Yacon syrup 1
Agave syrup 15-30
Date Sugar 20
Brown rice syrup (traditionally made) 25
Coconut sugar / Coconut nectar / Coconut syrup 30
Raw honey 35-58
Barley malt 40
Organic sugar 47
Maple syrup 54
Blackstrap molasses 54
Evaporated cane juice 55
Raw turbinado sugar 65
Corn syrup 75
White sugar 80
Beet sugar 80
High fructose corn syrup 87
Brown rice syrup (industrialized) 98
Yacon is Low Calorie
Clearly, yacon seems like a dream come true as an ideal sweetener given its extremely low glycemic index combined with a delicious, rich and very sweet taste.
In addition to a low glycemic index, yacon has a lower caloric content than other sugars. This is due to the special type of sweet tasting, low molecular weight carbohydrate called fructooligosaccharides (FOS). In fact, yacon has the highest concentration of FOS of any plant on the planet – up to 50%.
FOS are chemically composed of 1 molecule of glucose connected to between 2 and 10 fructose molecules. The bonds that connect the molecules of fructose are not broken down by enzymes present in the human digestive tract. FOS is therefore able to reach the colon without being broken down and digested by the body. It is for this reason that FOS have a low caloric value for humans (25-30% of the calories possessed by other sugars).
Yacon Nourishes Beneficial Gut Microbes
Besides being sweet and naturally low calorie, FOS is healthy for the digestive tract as well. It is considered a prebiotic, a type of soluble dietary fiber that encourages the growth of favorable intestinal flora. FOS does this by acting as food for these organisms similar to resistant starch. It is important to note that prebiotics are not alive like probiotics are. Prebiotics like FOS are a functional food, whereas probiotics are living organisms.
By nourishing these helpful microbes known as probiotics, a “prebiotic effect” occurs where there is an increase in the activity of healthy bacterial colonies such as bifidobacteria and lactobacilli. This strengthens the gut environment and provides resistance to invading pathogens thereby shoring up the immune system.
The great news is that prebiotics like FOS are not destroyed by heat, and so, to a large extent, remain unaltered during the cooking or baking process. It also ensures that they will reach the intestines unaffected by the digestive process in order to trigger the beneficial prebiotic effect.
Benefits of Yacon to Digestion
Other benefits of FOS to digestion include:
- an increase of intestinal peristaltic movements
- a reduction in intestinal transit time
- an increase in the amount of water retained by the fecal matter
- an osmotic effect similar to a laxative
These combined effects are helpful in the prevention and control of constipation.
Other favorable health effects have also been associated with the fermentation of FOS in the colon including an overall strengthening of the immune system, higher absorption of calcium and other minerals, and inhibition of the production of toxins and other carcinogenic substances in the colon.
It certainly appears like yacon is a beneficial sweetener to use in the home as the compound responsible for its sweetness known as FOS does not increase the amount of glucose in the blood (low glycemic index) and it strengthens the gut environment and overall immune system. In addition, it is low calorie and totally natural to boot.
What about the processing? Is that ok too? Let’s take a look.
Is Yacon Like Agave – Another Modern Sweetener Scam?
When I first began investigating the use of yacon in our home as a sweetener, I was skeptical. I was primarily concerned that the processing would be similar to agave. Like yacon, agave is also touted as a healthy, natural, low glycemic sweetener that is helpful for those with blood sugar issues. In truth, however, agave nectar is a highly processed sweetener with no redeeming nutrient value whatsoever.
Here are some of the biggest issues with agave as a sweetener:
- Conversion of the starchy agave root bulb into “nectar” requires a highly chemical process using genetically modified enzymes. This process is very similar to the production of high fructose corn syrup (HFCS).
- Saponins are present in the agave and yucca plants in large amounts. They should be avoided during pregnancy as it can induce miscarriage by stimulating uterine blood flow.
- The fructose in agave nectar is not L-fructose which is the primary fructose molecule in fruit or honey. Rather, it is D-fructose which is a reverse isomer with reverse polarity to the small amounts of natural D-fructose found in fruits. Alarmingly, this means that the D-fructose in agave is not recognized by the human body as are natural forms of fructose that are used for energy utilization. Instead, the unnatural form of D-fructose in agave primarily raises triglyceride levels and increases adipose (fat) tissue.
How Yacon is Processed into Syrup
What about the processing of yacon into yacon syrup? Here’s the process as I’ve determined by reading about it in detail:
Processing of the Roots
- The yacon roots are thoroughly cleaned to remove any soil and organic matter adhering to the root surface.
- The roots are disinfected using a highly dilute solution of water and sodium hypochlorite (.14 oz/4 ml per 34 oz/liter ) which is an approved chemical for organic postharvest processing (1).
- The roots are manually peeled to remove all traces of the skin as it contains components that negatively affect the quality of the final product and encourage oxidation of the yacon juice. It is likely in the future that the yacon skin will be removed by steam via a pressure cooker to reduce waste of raw material.
- The roots are juiced using a machine similar to a carrot juicer which shreds the yacon and allows for the immediate separation of the juice from the pulp.
Processing of the Juice into Syrup
- The juice is thermally maintained at a temperature of 140 F/60 C which deactivates enzymes that can oxidize the yacon juice. Note that heat does not negatively affect the beneficial FOS.
- The yacon juice is filtered with a stainless steel mesh to remove any remaining solids.
- The juice is concentrated into a pre-syrup via evaporation which removes the water in a process similar to what happens during maple syrup production.
- During the evaporation process, foam forms on the surface of the syrup and beings to crystallize. This is filtered out after the pre-syrup leaves the evaporator.
- The pre-syrup is further concentrated to form the final syrup. This is done in finishing pans that are much smaller than the evaporator. This reduces the amount of time that the syrup is exposed to heat, therefore reducing risk of burning and excessive caramelization. The pre-syrup is simply poured introduced into the finishing pans, which are then placed over a heat source. The syrup is boiled until it reaches a concentration between 68 and 70° Brix (this is measured with a refractometer). The heat source can be as basic as a domestic propane stove.
- The syrup is filtered one more time to once again eliminate crystallized sugars that formed during the finishing process.
- The yacon syrup is bottled using a stainless steel dispensing tank.
Is Any of This Processing Problematic?
After thorough review of the processing of yacon into yacon syrup, I really could not find a reason not to use it in moderation in my home. The processing is not excessive nor does it use caustic chemicals at least when an organic brand is selected (this is the one I’ve tried). In fact, the processing of yacon tubers into yacon syrup seems to be something that could be done yourself if you have the wherewithal and access to a maple syrup type evaporator.
Of course, as with any sweetener, yacon should be used in moderation. FOS in large amounts can induce digestive distress as it is a fiber source. Just because it is low calorie and has a low glycemic index does not give license to overdo!
Yacon Syrup a Much Better Choice than Sugar Alcohols
Yacon has more than a little competition in the alternative sweetener department with the most popular known as sugar alcohols.
Sugar alcohols are interestingly comprised of neither sugar nor alcohol. The most familiar of these are xylitol, erythritol, mannitol, and sorbitol.
Consumers have been led by aggressive marketing to view sugar alcohols as healthy because they are not artificial like aspartame. Like yacon, these products have low glycemic indexes and are marketed to diabetics and those who wish to lose weight as ideal sugar substitutes because they are derived from natural plant based sources.
However, unlike yacon, sugar alcohols are highly processed, frequently come from genetically modified sources, and have the potential to negatively affect the intestinal environment for those who consume them. This occurs via disruption of the balance of beneficial intestinal flora by encouraging pathogen growth in the gut.
If you need a sweetener with an ultra low glycemic index that is also low calorie, yacon is the far better choice than any sugar alcohol on the market!
Yacon Tea Not a Good Choice!
While yacon does indeed appear to be a healthy alternative sweetener when used in moderation, if you regularly consume soy in your diet, it is best to skip it and choose another sweetening option. This is because the unusually high level of fructooligosaccharides (FOS) in yacon appears to increase the absorption of the isoflavones in soy which has the potential to disrupt hormonal balance over time. Remember also that the isoflavones in soy have been found via research to be present in the yolks of hens fed soy based feed so this is another source of these phytoestrogens that can easily go unnoticed (2).
In addition, tea made from yacon leaves should not be consumed. Note also that yacon tea is not to be confused with yerba mate tea. Research published in the Journal of Ethnopharmacology suggests that water infusions made from yacon leaves are toxic to the kidneys. Beware as yacon leaves are commonly marketed and sold as “anti-diabetic” tea. Compounds knows as sesquiterpene lactones (STLs) contained in yacon leaves are thought to cause the primary toxicity. Based on this research, scientists do not recommend yacon leaves or yacon leaf extract to be sold to treat diabetes (3).
Yacon Syrup: Principles and Processing