Sugar Alcohols in Foods: What Are They, How Are They Made, and Are They Harmful?

Sugar Alcohols in Foods: What Are They, How Are They Made, and Are They Harmful?


Sugar alcohols, also known as polyols, have been gaining popularity as sugar substitutes in various food products. They provide fewer calories than sugar and do not cause rapid spikes in blood sugar levels, making them an attractive option for diabetics and those watching their caloric intake. But what exactly are sugar alcohols? And are there potential health concerns associated with their consumption?

What are Sugar Alcohols?

Sugar alcohols are carbohydrates that are neither sugars nor alcohols. They are derived from sugar molecules and have a chemical structure that partially resembles sugar and partially resembles alcohol – hence the name. They naturally occur in many fruits and vegetables but can also be manufactured for commercial use in foods.

Common Types of Sugar Alcohols and Their Sources:

  1. Sorbitol: Found naturally in fruits like apples, pears, and cherries. It’s often used in sugar-free gums and candies.
  2. Xylitol: Sourced from birch wood or corn cobs. It’s popular in sugar-free chewing gums, toothpaste, and some confectionery.
  3. Erythritol: Typically made from fermented corn or wheat starch. It’s commonly used in sugar-free baked goods and beverages.
  4. Mannitol: Found in seaweed and is also produced by man-made processes. Used in pharmaceuticals and as a sugar substitute in foods.
  5. Isomalt: Derived from beets and is often used in hard candies and cough drops.
  6. Lactitol: Made from lactose, which is derived from milk. Commonly found in sugar-free ice cream and chocolates.

The Science Behind Their Effects on Health:

While sugar alcohols offer several benefits, such as reduced calorie content and a lower glycemic index, there are also concerns regarding their consumption.

  1. Digestive Issues: Sugar alcohols are not fully absorbed by the body. They travel to the large intestine where they are fermented by bacteria. This can lead to gas, bloating, and diarrhea, especially when consumed in large amounts.
  2. Laxative Effect: Some sugar alcohols, like mannitol and sorbitol, can have a laxative effect. Consuming large quantities can lead to diarrhea or upset stomach.
  3. Allergic Reactions: Rarely, some individuals might have an allergic reaction to certain sugar alcohols, such as xylitol.
  4. Toxicity in Pets: While not harmful to humans in moderate amounts, xylitol is toxic to dogs and can lead to rapid insulin release, causing hypoglycemia (low blood sugar).
  5. Effect on Gut Microbiota: There’s emerging research suggesting that excessive consumption of sugar alcohols might alter gut microbiota, potentially impacting digestive health.

Why They Are an Area of Concern:

While sugar alcohols are generally recognized as safe by many food safety authorities, their overconsumption, especially in sensitive individuals, can lead to digestive discomfort. The presence of these substances in a wide range of products, from candies to baked goods, means that individuals might consume more than they realize.

Moreover, while they do offer a reduced calorie and sugar alternative, it’s essential to understand that they are not entirely calorie-free. Relying heavily on products with sugar alcohols as a “healthy” alternative might still contribute to calorie intake.


Sugar alcohols can be a beneficial alternative to sugars, especially for those with specific dietary concerns. However, like all things, they should be consumed in moderation. Being aware of the potential side effects and monitoring one’s intake can help mitigate the adverse effects. Always consult with a healthcare professional or nutritionist when making significant changes to your diet.