Sucrose – Table Sugar Explained Simply
Sucrose is a naturally occurring disaccharide composed of glucose and fructose, commonly known as table sugar. It provides quick energy but may harm health when consumed in excess.
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Sucrose is a naturally occurring disaccharide composed of glucose and fructose, commonly known as table sugar. It provides quick energy but may harm health when consumed in excess.
What is Sucrose?
Sucrose is a disaccharide – a double sugar – made up of one molecule of glucose and one molecule of fructose joined by a glycosidic bond. It is the most widely used sweetener in the world and is commonly known as table sugar, granulated sugar, or white sugar. Sucrose is naturally found in sugarcane (Saccharum officinarum) and sugar beets (Beta vulgaris), from which it is commercially extracted and refined.
Chemical Properties
The molecular formula of sucrose is C12H22O11. It is highly soluble in water, has a pleasant sweet taste, and melts at approximately 186 °C, at which point it begins to caramelize. The bond linking glucose and fructose is known as an alpha-1,beta-2-glycosidic bond.
Metabolism and Biological Function
When sucrose is consumed, it is broken down in the small intestine by the enzyme sucrase (also called invertase) into its two components, glucose and fructose. These are then absorbed through the intestinal wall into the bloodstream:
- Glucose is used directly as an energy source or stored as glycogen in the liver and muscles.
- Fructose is primarily metabolized in the liver, where it can be converted into fat when consumed in excess.
Sucrose provides approximately 4 kcal (17 kJ) per gram and is considered a rapidly available energy source.
Dietary Sources
Sucrose occurs naturally in many fruits, vegetables, and plants. It is also added to a wide range of processed foods:
- Confectionery, chocolate, and baked goods
- Soft drinks and fruit juices
- Yogurt, cereals, and granola bars
- Sauces, ketchup, and ready meals
- Jams, preserves, and spreads
Recommended Intake
The World Health Organization (WHO) recommends limiting the intake of free sugars – including sucrose – to less than 10% of total daily energy intake. A further reduction to below 5% (approximately 25 g per day for an adult) is recommended for additional health benefits. These guidelines are also supported by major national dietary organizations worldwide.
Health Effects of Excessive Consumption
Consistently high sucrose intake is associated with several health risks:
- Tooth decay (dental caries): Oral bacteria ferment sucrose into acids that erode tooth enamel.
- Overweight and obesity: Excess sugar contributes to surplus caloric intake and fat accumulation.
- Type 2 diabetes: Chronic high sugar consumption can promote insulin resistance.
- Non-alcoholic fatty liver disease (NAFLD): Excess fructose is converted to fat in the liver.
- Cardiovascular disease: High sugar intake has been associated with an increased risk of heart disease.
Sucrose Intolerance
A rare but clinically significant condition is sucrase-isomaltase deficiency (congenital sucrase-isomaltase deficiency, CSID). In this condition, the enzyme sucrase is absent or dysfunctional, preventing proper digestion of sucrose. Affected individuals experience bloating, abdominal pain, and diarrhea after consuming sucrose-containing foods. Management involves dietary restriction of sucrose and, in some cases, enzyme replacement therapy.
Sucrose in Medicine
Sucrose also has medical applications. In neonatology, oral sucrose solution is commonly used as a short-term analgesic for newborns during minor painful procedures such as heel pricks. Additionally, sucrose is frequently used as an excipient (inactive ingredient) in pharmaceutical syrups and tablet coatings.
References
- World Health Organization (WHO) – Guideline: Sugars intake for adults and children. Geneva, 2015. Available at: https://www.who.int/publications/i/item/9789241549028
- Cummings J.H., Stephen A.M. – Carbohydrate terminology and classification. European Journal of Clinical Nutrition. 2007;61(Suppl 1):S5-S18.
- Lustig R.H. et al. – Fructose: metabolic, hedonic, and societal parallels with ethanol. Journal of the American Dietetic Association. 2010;110(9):1307-1321.
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