What are carbohydrates:
Carbohydrates (or carbohydrates) are highly energetic molecules essential for the development of life.
They are composed mainly of carbon (C), hydrogen (H) and oxygen (O) atoms. The term carbohydrates, sugars and carbohydrates is interchangeable.
In the diet, carbohydrates are what are known as sugars. These can be of simple chemical composition, such as glucose, or of more complex chemical composition, such as starch.
Types of carbohydrates
Below are the types of carbohydrates.
- Simple carbohydrates: contain only one or two types of sugars. For example, glucose, found in table sugar, or maltose, found in barley grains.
- Complex carbohydrates: contain more than two types of sugars.
- Starches: are complex carbohydrates with a high glucose content. Potato or potato starch is a chain made up of several glucose molecules linked together. It is easily assimilated by humans.
- Fibers: contain indigestible carbohydrates. An example is cabbages. These (like starches) have complex carbohydrate mixtures. Its usefulness in the human diet is to regulate digestion.
Function of carbohydrates
The main functions of carbohydrates are:
- Energy supply: most of the carbohydrates consumed in the human diet are digested and transformed into glucose and glucose is the main source of energy (known as ATP) to keep the body functioning.
- Energy storage: excess glucose is transformed into a molecule called glycogen and stored in the liver: every time the body requires sugar immediately, it breaks down glycogen instantly, converting it into glucose.
- Tissue formation: Carbohydrates, in combination with other molecules, form the structural basis of many tissues in the human body. For example, cell membranes can contain up to 10% carbohydrates in association with proteins and lipids.
Carbohydrates in the diet
Even when vegetables and fruits contain carbohydrates, in nutrition, carbohydrates are considered to be sugars from legumes, cereals and dairy products, among others.
The recommended carbohydrates in diets are complex carbohydrates, because these must go through more steps of digestion to be absorbed and used.
While simple carbohydrates are easily absorbed and energy is obtained quickly.Long-chain sugars (oligosaccharides and polysaccharides) must first break internal bonds between the sugars in the chain, releasing simple sugar units.
Structural classification of carbohydrates
Below is the structural classification of carbohydrates:
- Monosaccharides: they are simple sugars in their most basic form.
- Disaccharides: formed by the union of two monosaccharides.
- Oligosaccharides: contains between 3 and 10 monosaccharides. It is a polymer.
- Polysaccharides - Contains long chains of monosaccharides connected to each other in different orientations.