The amino acids They are one of the fundamental elements for life, fulfilling multiple functions in our body. If you have ever entered the world of sports or nutrition, you have probably heard of them. These molecules combine to form proteins, which are essential for the correct functioning of the body. Their importance has become evident in the field of sports supplementation and daily diet, given their ability to form new muscle mass, repair tissues and break down food for the development of the body.
In this article, we will discuss in detail What are amino acids, their types, functions and the importance they have in our diet. In turn, we will analyze which foods are rich in amino acids and answer frequently asked questions about their role in our health.
What are amino acids
Amino acids are organic compounds formed mainly by carbon, hydrogen, oxygen and nitrogenIts molecular structure includes an amino group (-NH2), a carboxyl group (-COOH), a hydrogen atom, and a specific side chain (or R group) that varies for each amino acid.
These compounds play a crucial role in several essential metabolic activities: food breakdown, tissue repair and growth. They can also act as an alternative energy source and are involved in muscle contraction and maintaining the body's acid-base balance.
In sports, amino acids are highly valued for their ability to promote synthesis of new muscle proteins, which promotes increased muscle mass and recovery after physical effort. Thanks to these functions, amino acids have become a frequent topic, both in the field of science and in sports supplementation circles.
Composition and types of amino acids
The composition of amino acids always follows a similar pattern: an amino group, a carboxyl group, a hydrogen atom, and a side chain (or R group). Depending on the side chain, amino acids can be classified into different types, and this variation is what determines their specific properties and functions.
They exist around 250 amino acids known, but only 20 of them are proteinogenic, that is, those that form proteins in our body. These 20 amino acids are divided into three large groups:
- Essentials: Our bodies cannot synthesize them, so we must obtain them through food. Essential amino acids include histidine, isoleucine, leucine, lysine, methionine, phenylalanine, threonine, tryptophan and valine.
- Non-essential: The body is capable of producing these amino acids, so it is not essential to obtain them in the diet. Examples of non-essential amino acids are alanine, asparagine, aspartic acid and glutamic acid.
- Conditionals: These amino acids are only necessary in cases of illness or significant stress. Some conditional ones are arginine, glutamine, tyrosine, glycine, ornithine, proline and serine.
Different classifications
In addition to their classification into essential, non-essential and conditional, amino acids can be classified according to other criteria. For example, they can be divided according to the difference in charge in their structure:
- Acidic, basic or neutral amino acids: The number of acidic or basic groups in the molecule allows them to be differentiated into these three groups.
- Structure: Depending on the structure of their side chain, they can be classified as aliphatic (such as glycine), aromatic (such as phenylalanine) or sulfurous (such as cysteine).
Functions of amino acids
Amino acids perform various vital functions, as they are the building blocks of proteins that perform various tasks in the body. Some of their main functions are:
- Structural function: They are part of the structure of body tissues, such as muscles, skin, hair and nails.
- Energy production: When the body does not have access to enough carbohydrates or fats to produce energy, amino acids can be used as a fuel source.
- Enzyme and hormonal regulation: Enzymes that catalyze chemical reactions in the body, as well as many hormones, are made up of proteins whose basic components are amino acids.
- Immune function: Some amino acids, such as lysine, help in the production of antibodies and strengthen the immune system, preventing infections and diseases.
- Detoxification: Amino acids such as methionine and cysteine are involved in removing toxins from the body, essential for liver and kidney health.
Foods rich in amino acids
To meet our amino acid needs, it is important to include foods that are rich in protein in our diet, as these are the main sources of amino acids. Some of the foods richest in protein (and therefore amino acids) include:
- Milk and dairy: A daily glass of milk or 150 grams of yogurt or cheese provide a considerable amount of essential amino acids.
- Meat and fish: Between 60 and 90 grams of meat or fish per day are sufficient to cover amino acid requirements. White fish and tuna require larger quantities (around 140 grams) to achieve the same proportions.
- Legumes and nuts: Foods such as lentils, chickpeas, almonds and sunflower seeds are rich in vegetable proteins that also provide essential amino acids.
- Soy and derivatives: Tofu, spelt and quinoa, all derived from soy, provide essential amino acids of plant origin.
We must not forget that a balanced diet is key to ensuring an adequate supply of all essential amino acids. Furthermore, it is important to note that, although animal proteins are of high biological value (because they contain all essential amino acids), vegetable proteins can also supplement amino acid needs when properly combined.
Importance of amino acids for health
The proper balance of amino acids in our diet is essential not only for the growth and maintenance of our tissues, but also for preventing various diseases. A diet deficient in amino acids can lead to serious health problems such as:
- Growth deficit: In children, a lack of essential amino acids can lead to delays in physical and cognitive development.
- Digestive problems: A deficiency in certain amino acids can make it difficult to digest and absorb other essential nutrients.
- Lack of energy: Without the necessary amino acids, the body may not have enough energy to perform basic functions, which can lead to chronic fatigue.
- Emotional problems: Amino acids also play an essential role in the production of neurotransmitters, so their deficiency can cause anxiety and depression.
It is important to make a plasma amino acid test in cases where an imbalance of these compounds is suspected, which can manifest itself in symptoms such as fatigue, muscle weakness or cognitive problems. An early diagnosis allows for adjustment of the diet and, if necessary, supplementation with specific amino acids.
Amino acids should not be missing in a balanced diet, because, in addition to being the basic units of proteins, they control different vital functions to keep us healthy.