Sorbitol (E420) – Effects, Intolerance and Uses
Sorbitol (E420) is a natural sugar alcohol used as a sweetener and humectant in food products, cosmetics, and medications.
Wissenswertes über "Sorbitol"
Sorbitol (E420) is a natural sugar alcohol used as a sweetener and humectant in food products, cosmetics, and medications.
What is Sorbitol?
Sorbitol (also known as glucitol, food additive E420) is a six-carbon sugar alcohol (polyol) that occurs naturally in many fruits such as apples, pears, plums, and cherries. It is commercially produced by the hydrogenation of glucose and is widely used as a reduced-calorie sweetener, humectant, and texturizing agent in foods, cosmetics, and pharmaceutical products.
Natural Sources and Uses
Natural Sources
- Apples, pears, plums, cherries, and peaches
- Dried fruits (e.g., prunes, raisins)
- Rowan berries (mountain ash)
Industrial Applications
- Food industry: Sugar-free chewing gum, candies, baked goods, diet products, and diabetic foods
- Pharmaceuticals: Excipient in tablets, syrups, and suppositories; also used as an osmotic laxative
- Cosmetics: Humectant in creams, lotions, and dental care products
- Medical nutrition: Component in enteral and parenteral nutrition solutions
Metabolism and Mechanism of Action
Sorbitol is slowly and only partially absorbed in the small intestine. Once absorbed, it is metabolized in the liver, first being converted to fructose and then to glucose. Because the initial metabolic step is independent of insulin, sorbitol was historically favored in products for people with diabetes. However, it still provides approximately 2.4 kcal per gram and can influence blood glucose levels, so its use in diabetic patients is now viewed with more caution.
Unabsorbed sorbitol passes into the large intestine, where it draws water into the gut through osmosis, producing a laxative effect. This mechanism is used therapeutically in the treatment of constipation.
Sorbitol Intolerance (Sorbitol Malabsorption)
A significant proportion of the population absorbs sorbitol incompletely. When excess sorbitol reaches the colon, it is fermented by intestinal bacteria, leading to characteristic gastrointestinal complaints. It is estimated that up to 60–70% of adults experience some degree of sorbitol malabsorption.
Symptoms of Sorbitol Malabsorption
- Bloating and flatulence
- Abdominal cramps and pain
- Diarrhea (osmotically induced)
- Nausea
Diagnosis
Sorbitol malabsorption is typically diagnosed using a hydrogen breath test (H2 breath test) following the oral ingestion of a defined dose of sorbitol solution. An increase in hydrogen concentration in exhaled air indicates incomplete absorption in the small intestine.
Management and Dietary Adjustments
There is no specific drug treatment for sorbitol intolerance. The primary approach is reducing the intake of sorbitol-rich foods. Affected individuals should check food labels carefully, as sorbitol must be declared under the name E420. Many people can tolerate small amounts without symptoms, and individual threshold levels vary considerably.
Medical Use as a Laxative
As an osmotic laxative, sorbitol is used in concentrations of 25–70%, either rectally (as an enema) or orally. It draws water into the intestinal lumen, softens stool, and stimulates bowel movement. It is intended for short-term use in cases of constipation and is not recommended for prolonged use.
Safety and Labeling Requirements
Sorbitol is considered a safe food additive by the European Food Safety Authority (EFSA), with no established acceptable daily intake (ADI). Foods containing more than 10 g of sorbitol per 100 g must carry the warning statement: Excessive consumption may produce laxative effects.
References
- European Food Safety Authority (EFSA): Re-evaluation of sorbitol (E 420) as a food additive. EFSA Journal 2015;13(12):4321.
- Ledochowski M. et al.: Fructose- and sorbitol-reduced diet improves mood and gastrointestinal disturbances in fructose malabsorbers. Scand J Gastroenterol. 2000;35(10):1048-1052.
- World Health Organization (WHO) / FAO: Evaluation of certain food additives and contaminants. WHO Technical Report Series, No. 952, Geneva, 2009.
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Related search terms: Sorbitol + Sorbit + E420