A sugar substitute is a food additive that provides a sweet taste like that of sugar while containing significantly less food energy. Some sugar substitutes are produced by nature, and others produced synthetically. Those that are not produced by nature are, in general, called artificial sweeteners.
- 1 Types of sugar substitutes
- 2 Use
- 3 Sugar substitutes
- 4 Sweetness relative to sucrose
- 5 Health effects
- 6 See also
- 7 Notes
- 8 References
- 9 Further reading
- 10 External links
Types of sugar substitutes
An important class of sugar substitutes is known as high-intensity sweeteners. These are compounds with many times the sweetness of sucrose, common table sugar. As a result, much less sweetener is required and energy contribution is often negligible. The sensation of sweetness caused by these compounds (the "sweetness profile") is sometimes notably different from sucrose, so they are often used in complex mixtures that achieve the most natural sweet sensation.
If the sucrose (or other sugar) that is replaced has contributed to the texture of the product, then a bulking agent is often also needed. This may be seen in soft drinks or sweet teas that are labeled as "diet" or "light" that contain artificial sweeteners and often have notably different mouthfeel, or in table sugar replacements that mix maltodextrins with an intense sweetener to achieve satisfactory texture sensation.
In the United States, seven intensely sweet sugar substitutes have been approved for use. They are stevia, aspartame, sucralose, neotame, acesulfame potassium (Ace-K), saccharin, and advantame. Cyclamates are used outside the U.S., but have been prohibited in the U.S. since 1969. Others, which may or may not be approved, include Allulose (psicose), and monk fruit. The U.S. Food and Drug Administration regulates artificial sweeteners as food additives. Food additives must be approved by the FDA, which publishes a Generally Recognized as Safe (GRAS) list of additives. Stevia is exempt under the FDA's GRAS policy due to its being a natural substance in wide use well before 1958, and the FDA has approved it on these grounds. The conclusions about safety are based on a detailed review of a large body of information, including hundreds of toxicological and clinical studies.
The majority of sugar substitutes approved for food use are artificially synthesized compounds. However, some bulk natural sugar substitutes are known, including sorbitol and xylitol, which are found in berries, fruit, vegetables, and mushrooms. It is not commercially viable to extract these products from fruits and vegetables, so they are produced by catalytic hydrogenation of the appropriate reducing sugar. For example, xylose is converted to xylitol, lactose to lactitol, and glucose to sorbitol. Other natural substitutes are known, but these have yet to gain official approval for food use.
Some non-sugar sweeteners are polyols, also known as "sugar alcohols." These are, in general, less sweet than sucrose but have similar bulk properties and can be used in a wide range of food products. Sometimes the sweetness profile is “fine-tuned” by mixing these with high-intensity sweeteners. As with all food products, the development of a formulation to replace sucrose is a complex proprietary process.
Sugar substitutes are used instead of sugar for a number of reasons, including:
- To assist in weight loss – Some people choose to limit their food energy intake by replacing high-energy sugar or corn syrup with other sweeteners having little or no food energy. This allows them to eat the same foods they normally would while allowing them to lose weight and avoid other problems associated with excessive caloric intake.
- Dental care – Carbohydrates and sugars usually adhere to the tooth enamel, where bacteria feed upon them and quickly multiply. The bacteria convert the sugar to acids that decay the teeth. Sugar substitutes, unlike sugar, do not erode teeth as they are not fermented by the microflora of the dental plaque. A sweetener that can actually benefit dental health is xylitol, which tends to prevent bacteria from adhering to the tooth surface, thus preventing plaque formation and eventually decay. Xylitol cannot be fermented by bacteria that feed on sugar, so they have difficulty thriving, thus helping to prevent plaque formation.
- Diabetes mellitus – People with diabetes have difficulty regulating their blood sugar levels, and need to limit their sugar intake. Many artificial sweeteners allow sweet tasting food without increasing blood glucose. Others do release energy but are metabolized more slowly, preventing spikes in blood glucose.
- Reactive hypoglycemia – Individuals with reactive hypoglycemia will produce an excess of insulin after quickly absorbing glucose into the bloodstream. This causes their blood glucose levels to fall below the amount needed for proper body and brain function. As a result, like diabetics, they must avoid intake of high-glycemic foods like white bread, and often use artificial sweeteners for sweetness without blood glucose.
- Cost and shelf life – Many sugar substitutes are cheaper than sugar. Sugar substitutes are often lower in total cost because of their long shelf-life and high sweetening intensity. This allows sugar substitutes to be used in products that will not perish after a short period of time.
The three primary compounds used as sugar substitutes in the United States are saccharin (e.g., Sweet'N Low), aspartame (e.g., Equal, NutraSweet) and sucralose (e.g., Splenda, Altern). Maltitol and sorbitol are often used, frequently in toothpaste, mouth wash, and in foods such as "no sugar added" ice cream. Erythritol is gaining momentum as a replacement for these other sugar alcohols in foods as it is much less likely to produce gastrointestinal distress when consumed in large amounts. In many other countries, xylitol, cyclamate, and the herbal sweetener stevia are used extensively.
When sweeteners are provided for restaurant customers to add to beverages such as tea and coffee themselves, they are often available in paper packets which can be torn and emptied. In North America, the colors are typically white for sucrose, blue for aspartame, pink for saccharin,[note 1] yellow for sucralose (United States) or cyclamate (Canada), tan for turbinado, orange for monk fruit extract, and green for stevia. 
Food industry use
The food and beverage industry is increasingly replacing sugar or corn syrup with artificial sweeteners in a range of products traditionally containing sugar.
According to market analysts Mintel, a total of 3,920 products containing artificial sweeteners were launched in the U.S. between 2000 and 2005. In 2004 alone, 1,649 artificially sweetened products were launched. According to market analysts Freedonia in 2012, the United States artificial sweetener market is set to grow at around 8% per year.
Aspartame is currently the most popular artificial sweetener in the U.S. food industry, as the price has dropped significantly since its patent registered by Monsanto Company expired in 1992. However, sucralose may soon replace it, as alternative processes to Tate & Lyle's patent seem to be emerging. According to Morgan Stanley, this can mean that the price of sucralose will drop by thirty percent.
Sugar substitutes are highly consumed in America. In 2003–2004, Americans two years of age and older consumed 585 grams (21 oz) per day of beverages and 375 grams (13 oz) per day of foods with caloric sweeteners. More than 66% of Americans consumed these beverages with sugar substitutes and 82.3% of Americans consumed foods with added caloric sweeteners. On the other hand, 10.8% of Americans in 2003–2004 consumed non-caloric sweetener flavored beverages and 5.8% consumed non-caloric sweetener flavored foods.
Some commonly consumed foods with sugar substitutes are diet sodas, cereals, and sugar-free desserts such as ice cream. Sugar substitutes are found in many products today due to their low or non-caloric characteristics. This can be used to market a product to dieters or those conscious of their sugar intake, such as consumers with diabetes. Sugar substitutes such as xylitol and saccharin have many positive research results that show qualities of dental decay prevention, which causes them to be popular for use in chewing gums and toothpaste.
Aspartame was discovered in 1965 by James M. Schlatter at the G.D. Searle company (later purchased by Monsanto). He was working on an anti-ulcer drug and accidentally spilled some aspartame on his hand. When he licked his finger, he noticed that it had a sweet taste. It is an odorless, white crystalline powder that is derived from the two amino acids aspartic acid and phenylalanine. It is about 200 times as sweet as sugar and can be used as a tabletop sweetener or in frozen desserts, gelatins, beverages, and chewing gum. When cooked or stored at high temperatures, aspartame breaks down into its constituent amino acids. This makes aspartame undesirable as a baking sweetener. It is more stable in somewhat acidic conditions, such as in soft drinks. Though it does not have a bitter aftertaste like saccharin, it may not taste exactly like sugar. When eaten, aspartame is metabolized into its original amino acids. Because it is so intensely sweet, relatively little of it is needed to sweeten a food product, and is thus useful for reducing the number of calories in a product.
The safety of aspartame has been studied extensively since its discovery with research that includes animal studies, clinical and epidemiological research, and postmarketing surveillance, with aspartame being one of the most rigorously tested food ingredients to date. Aspartame has been subject to multiple claims against its safety, including supposed links to cancer as well as complaints of neurological or psychiatric side effects. Multiple peer-reviewed comprehensive review articles and independent reviews by governmental regulatory bodies have analyzed the published research on the safety of aspartame and have found aspartame is safe for consumption at current levels. Aspartame has been deemed safe for human consumption by over 100 regulatory agencies in their respective countries, including the UK Food Standards Agency, the European Food Safety Authority (EFSA) and Canada's Health Canada.
In the United States, the Food and Drug Administration (FDA) banned the sale of cyclamate in 1969 after lab tests in rats involving a 10:1 mixture of cyclamate and saccharin indicated that large amounts of cyclamates causes bladder cancer, a disease to which rats are particularly susceptible. Cyclamates are still used as sweeteners in many parts of the world, including Europe (e.g. UK and Russia).
Aside from sugar of lead, saccharin was the first artificial sweetener and was originally synthesized in 1879 by Remsen and Fahlberg. Its sweet taste was discovered by accident. It had been created in an experiment with toluene derivatives. A process for the creation of saccharin from phthalic anhydride was developed in 1950, and, currently, saccharin is created by this process as well as the original process by which it was discovered. It is 300 to 500 times as sweet as sugar (sucrose) and is often used to improve the taste of toothpastes, dietary foods, and dietary beverages. The bitter aftertaste of saccharin is often minimized by blending it with other sweeteners.
Fear about saccharin increased when a 1960 study showed that high levels of saccharin may cause bladder cancer in laboratory rats. In 1977, Canada banned saccharin due to the animal research. In the United States, the FDA considered banning saccharin in 1977, but Congress stepped in and placed a moratorium on such a ban. The moratorium required a warning label and also mandated further study of saccharin safety.
Subsequent to this, it was discovered that saccharin causes cancer in male rats by a mechanism not found in humans. At high doses, saccharin causes a precipitate to form in rat urine. This precipitate damages the cells lining the bladder (urinary bladder urothelial cytotoxicity) and a tumor forms when the cells regenerate (regenerative hyperplasia). According to the International Agency for Research on Cancer, part of the World Health Organization, "Saccharin and its salts was (sic) downgraded from Group 2B, possibly carcinogenic to humans, to Group 3, not classifiable as to carcinogenicity to humans, despite sufficient evidence of carcinogenicity to animals, because it is carcinogenic by a non-DNA-reactive mechanism that is not relevant to humans because of critical interspecies differences in urine composition."
In 2001 the United States repealed the warning label requirement, while the threat of an FDA ban had already been lifted in 1991. Most other countries also permit saccharin but restrict the levels of use, while other countries have outright banned it.
The EPA has officially removed saccharin and its salts from their list of hazardous constituents and commercial chemical products. In a 14 December 2010, release the EPA stated that saccharin is no longer considered a potential hazard to human health.
Stevia has been widely used as a natural sweetener in South America for centuries and in Japan since 1970. Due to its unique characteristics of zero glycemic index and zero calories, it is fast becoming popular in many other countries. In 1987, the FDA issued a ban on stevia because it had not been approved as a food additive. After being repeatedly provided with a significant amount of scientific data proving that there was no side-effect of using stevia as a sweetener from companies such as Cargill and Coca-Cola, the FDA gave a "no objection" approval for GRAS status in December 2008 to Truvia, a blend of rebiana and erythritol (developed by Cargill and The Coca-Cola Company), as well as PureVia (developed by PepsiCo and the Whole Earth Sweetener Company, a subsidiary of Merisant), both of which using rebaudioside A derived from the Stevia plant. In Australia, the brand Vitarium have used Natvia, a natural stevia sweetener, to do a range on sugar-free children's milk mixes.
Sucralose is a chlorinated sugar that is about 600 times as sweet as sugar. It is produced from sucrose when three chlorine atoms replace three hydroxyl groups. It is used in beverages, frozen desserts, chewing gum, baked goods, and other foods. Unlike other artificial sweeteners, it is stable when heated and can therefore be used in baked and fried goods. About 15% of sucralose is absorbed by the body and most of it passes out of the body unchanged. The FDA approved sucralose in 1998.
Most of the controversy surrounding Splenda, a sucralose sweetener, is focused not on safety but on its marketing. It has been marketed with the slogan, "Splenda is made from sugar, so it tastes like sugar." Sucralose is prepared from either of two sugars, sucrose or raffinose. With either base sugar, processing replaces three oxygen-hydrogen groups in the sugar molecule with three chlorine atoms.
The "Truth About Splenda" website was created in 2005 by The Sugar Association, an organization representing sugar beet and sugar cane farmers in the United States, to provide its view of sucralose. In December 2004, five separate false-advertising claims were filed by the Sugar Association against Splenda manufacturers Merisant and McNeil Nutritionals for claims made about Splenda related to the slogan, "Made from sugar, so it tastes like sugar". French courts ordered the slogan to no longer be used in France, while in the U.S. the case came to an undisclosed settlement during the trial.
There are few safety concerns pertaining to sucralose and the way sucralose is metabolized suggests a reduced risk of toxicity. For example, sucralose is extremely insoluble in fat and, thus, does not accumulate in fatty tissues; sucralose also does not break down and will dechlorinate only under conditions that are not found during regular digestion (i.e., high heat applied to the powder form of the molecule).
Acesulfame potassium (Ace-K) is 200 times sweeter than sucrose (common sugar), as sweet as aspartame, about two thirds as sweet as saccharin, and one third as sweet as sucralose. Like saccharin, it has a slightly bitter aftertaste, especially at high concentrations. Kraft Foods has patented the use of sodium ferulate to mask acesulfame's aftertaste. Acesulfame potassium is often blended with other sweeteners (usually aspartame or sucralose), which give a more sucrose-like taste, whereby each sweetener masks the other's aftertaste and also exhibits a synergistic effect in which the blend is sweeter than its components.
Unlike aspartame, acesulfame potassium is stable under heat, even under moderately acidic or basic conditions, allowing it to be used as a food additive in baking or in products that require a long shelf life. In carbonated drinks, it is almost always used in conjunction with another sweetener, such as aspartame or sucralose. It is also used as a sweetener in protein shakes and pharmaceutical products, especially chewable and liquid medications, where it can make the active ingredients more palatable.
Lead acetate (historic)
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Lead acetate (sometimes called sugar of lead) is an artificial sugar substitute made from lead that is of historical interest because of its widespread use in the past, such as by ancient Romans. The use of lead acetate as a sweetener eventually produced lead poisoning in any individual ingesting it habitually. Lead acetate was abandoned as a food additive throughout most of the world after the high toxicity of lead compounds became apparent.
More recently, mogrosides (typically extracted from monk fruit) have been used in commercial products after the FDA granted some of the compounds GRAS status in 2010. As of 2011, it is not (yet) a permitted sweetener in the EU, although it is allowed as a natural flavor at concentrations where it does not function as a sweetener. Some of the products incorporating it are Nestlé's Milo in Asia and certain Kellogg cereals in the U.S. It is also the basis of McNeil Nutritionals's tabletop sweetener Nectresse in the U.S. and Norbu Sweetener in Australia. As of 2012, the New Zealand company BioVittoria provides more than 90 percent of the global supply of monk fruit extract; its main manufacturing facility for the product is in Guilin, China.
Sweetness relative to sucrose
Natural sugar substitutes
The sweetnesses and energy densities are in comparison to those of sucrose.
|Name||Sweetness by weight||Sweetness by food energy||Energy density||Notes|
|Hydrogenated starch hydrolysates||0.4–0.9||0.5×–1.2||0.75|
|Miraculin||A protein that does not taste sweet by itself but modifies taste receptors to make sour things taste sweet temporarily|
|Monatin||Naturally occurring sweetener isolated from the plant Sclerochiton ilicifolius|
|Monellin||3,000||Protein; the sweetening ingredient in serendipity berries|
|Sorbitol||0.6||0.9||0.65||sugar alcohol, E420|
|Stevia||250||Extracts known as rebiana, Sweet and Fit Stevia, Truvia, PureVia; mainly containing rebaudioside A, a steviol glycoside|
Artificial sugar substitutes
Artificial sweeteners contain little or no food energy, making a comparison of sweetness based on energy content not meaningful.
|Name||Sweetness (by weight)||Trade name||Approval||Notes|
|Acesulfame potassium||200||Nutrinova||FDA 1988||E950 Hyet Sweet|
|Alitame||2,000||approved in Mexico, Australia, New Zealand and China.||Pfizer|
|Aspartame||160–200||NutraSweet, Equal||FDA 1981, EU-wide 1994||E951 Hyet Sweet|
|Salt of aspartame-acesulfame||350||Twinsweet||E962|
|Sodium cyclamate||30||FDA Banned 1969, approved in EU and Canada||E952, Abbott|
|Dulcin||250||FDA Banned 1950|
|P-4000||4,000||FDA banned 1950|
|Saccharin||300||Sweet'N Low||FDA 1958, Canada 2014||E954|
|Sucralose||600||Kaltame, Splenda||Canada 1991, FDA 1998, EU 2004||E955, Tate & Lyle|
A 2007 animal study indicated that a sweet taste induces an insulin response in rats. However, the extension of animal model findings to humans is unclear, as human studies of intragastric infusion of sucralose have shown no insulin response from analogous taste receptors.
A 2014 study by a collaboration of seventeen scientists from nine Israeli research institutes presented experimental evidence that artificial sweeteners may exacerbate, rather than prevent or mitigate, metabolic disorders such as Type 2 diabetes. They reported that artificial sweeteners increase the blood sugar levels in both mice and humans by altering the composition and function of the gut flora. Mice given drinking water supplemented with artificial sweetener (commercial formulations of saccharin, sucralose or aspartame) developed greater glucose intolerance than mice drinking pure water, or water with only sugar added. The effect occurred both in mice fed standard food and those on a high-fat diet. Changes in the composition of the gut flora were observed by sequencing a ribosomal RNA gene. When antibiotics were then used to kill off gut bacteria, the degree of glucose intolerance in mice fed either diet was restored to normal levels present before artificial sweetener was introduced. Human subjects were also studied; the gut bacteria from 381 non-diabetics averaging age 43 were analyzed, revealing differences in the gut bacteria between those subjects who habitually consumed artificial sweeteners and those who did not, as well as "markers" for diabetes, such as raised blood sugar levels and glucose intolerance. In a journal commentary, two researchers opined that artificial sweeteners "may contribute to, rather than alleviate, obesity-related metabolic conditions, by altering the composition and function of bacterial populations in the gut."
Comparison to sugar
Eating natural sugars like glucose instead of a sugar substitute can also have negative health effects. The calories contained in sugar-sweetened beverages contributes to increases in body weight and body fat, and replacement of sugar by artificial sweeteners reduces weight. Obesity contributes to diabetes and cardiovascular disease. Sucrose has a high glycemic index, glucose medium, and fructose low. The consumption of added sugars has been positively associated with multiple measures known to increase cardiovascular disease risk amongst adolescents as well as adults. There is "convincing evidence from human intervention studies, epidemiological studies, animal studies and experimental studies, for an association between the amount and frequency of free sugars intake and dental caries" while other sugars (complex carbohydrate) consumption is normally associated with a lower rate of dental caries.
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- Calorie Control Council—trade association for manufacturers of artificial sweeteners and products