AMINO ACIDS: The Essential Building Blocks of Life
Have you ever wondered what amino acids are and why they're so important for our bodies? Amino acids are organic molecules that form the building blocks of proteins and play a crucial role in most biological processes. But what else is there to know about them? Keep reading to find out!
What are amino acids?
Amino acids, sometimes abbreviated as AA, are organic molecules containing an amino group (-NH2) and a carboxyl group (-COOH). They are the building blocks of proteins and participate in a wide variety of cellular functions, from nerve transmission to the biosynthesis of porphyrins, purines, pyrimidines, and urea.
Two amino acids can combine in a condensation reaction, forming an amide bond known as a peptide bond. This reaction occurs naturally within cells, specifically in ribosomes. As more amino acids join together, polypeptides are formed, which are called proteins when they reach high molecular weights and have a stable three-dimensional structure.
Types of Amino Acids
There are hundreds of amino acids, but only 20 of them form proteins. These 20 amino acids can be classified in several ways, according to the properties of their side chain, their method of production, and the position of their amino group. Some amino acids are essential, meaning our bodies cannot produce them and they must be obtained through diet. Others are non-essential and can be synthesized by our bodies.
Importance of Amino Acids
Amino acids are vital for a number of functions in our bodies. They are necessary for building and repairing tissues, producing enzymes and hormones, and supporting the immune system. They also play a role in regulating sleep and mood.
Tips for a Diet Rich in Amino Acids
- Include Protein in Every Meal: Protein is the main source of amino acids. Foods such as meat, fish, eggs, dairy products, legumes, and nuts are rich in protein.
- Vary your protein sources: Different foods contain different combinations of amino acids. By varying your protein sources, you ensure you get all the amino acids you need.
- Eat Whole Foods: Some foods, such as quinoa and soy, contain all the essential amino acids and are known as complete proteins.
Final Reflections
Amino acids are more than just the building blocks of protein. They are essential for our health and well-being, and a deeper understanding of their function can help us make more informed choices about our diet and lifestyle. Are you getting enough amino acids in your diet? How could you improve your intake of these vital nutrients?
Remember, amino acids are key to a healthy life. Include them in your diet and feel the difference!
Free amino acids in the red fig fruit:
Alpha-Aminobutyric Acid, Glutamic Acid, Alanine, Arginine, Asparagine, Carnosine, Citrulline, Glutamine, Glycine, Histidine, Isoleucine, Leucine, Lysine, Methionine, Phenylalanine, Proline, Serine, Taurine, Threonine, Tryptophan, Tyrosine, and Valine
Amino acids with anti-stress and antidepressant properties
L-Isoleucine
An essential amino acid crucial for hemoglobin synthesis and for regulating blood glucose (energy) levels. After metabolism, L-isoleucine can be converted into both carbohydrates and lipids.
L-Leucine
Leucine is an essential amino acid whose main function is to reduce blood glucose levels. It also plays a role in tissue maintenance. Leucine is an amino acid with a particularly beneficial effect in post-surgical patients.
L-Valine
Considered a natural stimulant, L-valine plays an important role in tissue regeneration and in maintaining nitrogen balance.
Additionally, it is an amino acid necessary for the proper physiology of the nervous system and for proper muscle development and coordination.
Amino acids for muscles
The requirements for L-isoleucine, L-leucine, and L-valine are increased during periods of stress, including surgical procedures, trauma, infections, fever, and starvation. Therefore, they are effective agents in the management of patients undergoing surgery and those suffering from malnutrition.
They are three amino acids that are structurally very similar and although they follow different metabolic pathways, they are all involved in muscle metabolism.
Because they have different metabolic pathways, the requirements for each are different. They also differ in the symptoms that characterize their deficiencies. Valine deficiency is characterized by neurological deficits in the brain. Conversely, muscle tremors are characteristic signs of isoleucine deficiency.
L-Phenylalanine
An essential amino acid with antidepressant and analgesic properties. In addition to its effectiveness against depression, phenylalanine improves memory and has an anti-migraine effect. Among its functions, phenylalanine stimulates the synthesis of thyroxine by the thyroid gland (thyroxine contributes to maintaining mental balance and the nervous system).
Additionally, it is processed in brain tissue, producing norepinephrine and dopamine. Another of its effects is focused on what is known as 'mental alertness,' a process that includes the stimulation of learning and memory processes.
Its concentration is high in the brain and plasma. It acts as a powerful analgesic, improving headaches, arthritis, and trauma, and has an antidepressant effect.
It aids digestion
Histidine , an amino acid as important as any other, has positive effects on reproductive health and digestion.
A study conducted in China involving 92 participants examined a group of women with obesity and metabolic syndrome. It yielded favorable results regarding the use of histidine supplements, as these can decrease body mass index and insulin resistance.
This amino acid is not essential in adulthood. Studies indicate that L-histidine is involved in tissue repair processes, which explains its therapeutic benefit in the treatment of diseases such as rheumatoid arthritis and anemia. Its ability to be converted into histamine makes it useful in the management of allergies.
It improves emotional health
Tryptophan is an essential amino acid that contributes to growth in infants. It also regulates appetite, emotional state, and mental health in adults.
It has very varied effects. For example, it can act as a sedative and is used in cases of sleep management. A study validated the hypothesis that proteins from eggs have a positive impact on the emotional processing of elderly women.
Tryptophan's functions include mood stabilization, sleep promotion, and stress management. It is necessary for the proper utilization of B vitamins and stimulates digestive function.
Tryptophan administration has been shown to be beneficial in the maintenance of blood, skin, and capillary cells.
It helps with calcium absorption
Lysine It is one of the essential amino acids that provides many benefits. The skeletal system regularly needs to maintain and rebuild bone tissue. Calcium is the building block from which bones are formed. Lysine plays an important role in this process, increasing calcium absorption in the stomach and liver.
For this reason, it is recommended for people suffering from bone degeneration, such as those with signs of osteoporosis. Taking lysine and calcium supplements helps to stop and prevent such diseases.
In a study conducted on 27 people over 6 months, it was found that lysine indirectly helps to The healing of herpes . Although the relationship has not been fully discovered, it is presumed to be due to the benefits of calcium absorption.
L-lysine is an amino acid effective in controlling viral infections, with proven efficacy in treating infections caused by the herpes simplex virus (the agent that produces painful mouth ulcers and blisters). L-lysine exerts its effect by promoting antibody synthesis, thus stimulating the immune system.
Data from recent studies suggest that this amino acid is effective in the therapeutic management of caries and other dental disorders.
Although its main function is antiviral, the clinical presentation of lysine deficiencies is characterized by visual disturbances and chronic fatigue.
L-Methionine
An essential amino acid with a potent tissue detoxification effect. It plays a role in lipid metabolism and choline synthesis. Due to its detoxifying and protective properties, methionine is necessary for liver and kidney cell regeneration. It is also effective in the treatment of rheumatoid arthritis.
A deficiency in this amino acid induces growth abnormalities in laboratory animals; in humans, signs of deficiency include altered skin tone, hair loss, and toxin accumulation. It also appears to induce lipid accumulation in the liver, both in laboratory animals and in humans.
L-Threonine
Its plasma concentrations are particularly high in newborns. This amino acid is essential for proper digestive and intestinal function, as it is involved in the assimilation and absorption of various nutrients. Additionally, it has a stimulating effect on the thymus, a gland associated with the control of depression, with a consequent therapeutic effect on depression.
L-threonine deficiency manifests as gastric (maldigestion, heartburn) and intestinal (malabsorption) disturbances, leading to general malnutrition.
L-Taurine
This amino acid is not structurally part of proteins, and therefore is less well-known. In adults, it is not essential because they can synthesize it from dietary taurine. Its concentrations are high in brain, heart, and kidney tissue, where it acts as a protective agent, maintaining the health of these organs.
Amino acids that are energy substrates
L-Alanine
The synthesis of this amino acid occurs through complex processes involving molecules such as pyruvate and/or DNA cleavage; its metabolism is regulated by enzymatic processes dependent on vitamin B6. L-alanine concentrations are high in muscle tissue, where it acts as an energy substrate. As a therapeutic agent, it is effective against epilepsy and immunosuppression (thymus growth-stimulating amino acid).
Gamma Amino Butyric Acid (GABA): L-Glutamic Acid and L-Glutamine
Like the previous one, these are involved in energy synthesis processes. Additionally, they have an effect on brain tissue; L-glutamic acid is a stimulating neurotransmitter. Conversely, GABA is relaxing, while glutamine performs various brain functions. The three amino acids carry out their actions in an interrelated manner. Furthermore, glutamic acid, a neurotransmitter, is kept in balance with GABA, an inhibitory neurotransmitter; glutamine serves as the energy source, coordinating the balance between the two.
Amino acids with detoxifying function
L-Arginine
Among its functions, L-arginine plays a key role in the elimination of urea and ammonia, and contributes to DNA synthesis. Recent research shows that this amino acid stimulates growth hormone secretion. In certain pathological conditions, L-arginine can become an essential nutrient.
This molecule is particularly important in men; more than 80% of seminal fluid contains arginine. It has a positive effect on sperm count, so it could be a useful treatment for male infertility. Reduced arginine levels have been shown to lead to sterility in laboratory animals and low sperm motility in humans.
The clinical symptoms associated with arginine deficiency include: skin redness, hair loss and weakness, infertility, impaired wound healing, constipation, and blood accumulation of toxins (free radicals, waste products); it has even been linked to cirrhosis.
Amino acids with an antidepressant effect
L-Aspartic Acid: Its synthesis is carried out by enzymes that require vitamin B6. It is involved in the urea cycle and DNA metabolism. It is a neurotransmitter whose levels are decreased in patients suffering from depression or other brain disorders; aspartic acid appears to be important for proper brain energy metabolism (18). Its therapeutic uses are being investigated.
L-Glycine: This amino acid is involved in DNA and collagen synthesis, as well as energy production. Its levels are decreased in patients with depression and epilepsy. It has a cholesterol-lowering effect (reductions of up to 5%). Its effects are still being investigated.
L-Tyrosine: This molecule, once it reaches brain tissue, is converted into dopamine, norepinephrine, and epinephrine; their concentrations are dependent on dietary tyrosine levels. These three neurotransmitters are essential for the function of the sympathetic nervous system.
Additionally, it is a structurally necessary amino acid in many proteins, such as enkephalins (natural analgesics). There is even data suggesting a possible antidepressant effect.
