Sugars Boost Your Energy: Sugar Classification and Seven Major Benefits
86. Carbohydrates: Keep yourself energized
Carbohydrates are a class of organic compounds that are widely distributed in nature and are particularly important. Starch in grains, sucrose consumed daily, glucose in human blood, and cellulose in plants are all carbohydrates.
Carbohydrates play a vital role in maintaining normal life processes and are one of the essential energy sources for all living organisms. In plants, the most important sugars are cellulose and starch, while in animal cells, the most important sugar is glycogen.
Classification and nomenclature of sugars
(1) Monosaccharides: These are sugars that cannot be hydrolyzed into smaller molecules. Monosaccharide molecules are classified into ketoses and aldoses based on the position of the carbonyl group. They generally exist in a cyclic hemiacetal structure. Based on the number of carbon atoms in the molecule, tricarbon sugars are called pyruvose and aldose, while tetracarbon sugars are called butylulose and butylalose. The corresponding ketoses and aldoses are isomers. Monosaccharides containing 6, 5, and 4 carbon atoms are the most common in nature.
(2) Polysaccharides: Polysaccharides are polymers formed by the condensation of more than one monosaccharide molecule or its derivative. They can be divided into heteropolysaccharides and homopolysaccharides. Polysaccharides formed by the condensation of the same type of monosaccharide are called homopolysaccharides, such as cellulose and starch. Polysaccharides formed by the condensation of two or more monosaccharides or their derivatives are called heteropolysaccharides, such as chondroitin sulfate and hyaluronic acid. According to whether the sugar molecule has branches, they are divided into branched polysaccharides and linear polysaccharides. According to different functions, they are divided into antigenic polysaccharides, storage polysaccharides, structural polysaccharides, etc. According to their distribution location, they are divided into intracellular polysaccharides and extracellular polysaccharides.
(3) Conjugated polysaccharides: Sugars are covalently combined with other non-sugar substances to form sugar conjugates or conjugated polysaccharides, such as glycoproteins, glycolipids, proteoglycans, etc.
(4) Oligosaccharides: Containing 2 to 10 monosaccharide units, which are hydrolyzed to produce monosaccharides linked together by glycosidic bonds. Oligosaccharides are also called oligosaccharides. Oligosaccharides that exist in nature in a free state are mainly trisaccharides such as raffinose, sucrose and lactose, and disaccharides such as maltose.
Seven major benefits of carbohydrates
Glycoproteins constitute body tissues. Most life activities in the body require the participation of carbohydrates. For example, glycolipids are an important component of nerve tissue; mucins are an important component of connective tissue; and glycoproteins are an important component of cell membranes.
Providing energy (heat). The main function of sugar is to provide energy; middle-aged men need to supplement with at least 6 grams of sugar daily. Although fat produces twice as many calories per unit as sugar, the sugar content in the diet is far higher than that of fat. Sugar is a nutrient that produces heat, keeping a person warm.
Conserving protein. Sugars are widely distributed in nature, providing a convenient source of energy. By using sugars to provide energy, the body can conserve protein, allowing it to be primarily used for tissue building and regeneration.
Liver protection and detoxification. When liver glycogen reserves are abundant, the body's resistance to certain bacteria is greatly enhanced. Therefore, it is essential to maintain a rich supply of glycogen in the liver, which significantly improves its normal detoxification ability and effectively maintains liver health.
It can enhance appetite. Sugar is not only a food, but also an ingredient that can adjust the flavor of food and enhance appetite.
Anti-ketotic effect. For fat to be completely oxidized in the body, it requires glucose for energy. When there is insufficient glucose in the body, or when glucose is available but cannot be utilized, such as in diabetes, the required energy must be supplied by fat. Incomplete fat oxidation often produces ketone bodies. Excessive accumulation of ketone bodies can lead to low alkalinity and high acidity in the blood, potentially causing ketosis. Therefore, glucose has an anti-ketotic effect.
Enhances intestinal function and synthesizes vitamins. Carbohydrates contain fiber that cannot be digested and absorbed by the body. This type of fiber can promote intestinal peristalsis, prevent constipation, and provide energy for intestinal microorganisms to synthesize vitamin B.
When sucrose is ingested, it is converted into fructose and glucose by enzymes in the gastrointestinal tract. Some of the glucose is circulated throughout the body via the bloodstream, where it is broken down and oxidized in cells, ultimately producing water and carbon dioxide and generating energy. This energy provides power for muscle activity, brain function, and maintaining body temperature. Glucose in the blood is called blood sugar. Besides being used by cells, the remainder is synthesized into glycogen by tissues such as muscles and the liver and stored for later use.