Methionine is an essential amino acid that the body cannot produce on its own, which means it must be obtained through the diet or supplements. Methionine is one of the nine essential amino acids, and it plays an essential role in protein synthesis, cellular growth, and tissue repair.
Methionine is a sulfur-containing amino acid, and it's involved in the formation of other important sulfur-containing compounds, including cysteine, taurine, and glutathione. Methionine is also important for the synthesis of carnitine, which is involved in energy metabolism.
Methionine plays several crucial roles in the body, making it an essential nutrient for human health. It is a key component in protein synthesis, which is vital for growth, repair, and maintenance of body tissues. Methionine also helps produce a variety of important molecules, including cysteine, taurine, and glutathione, which play roles in antioxidant defense, immune function, and detoxification.
Methionine is also important for the production of S-adenosylmethionine (SAMe), which is involved in a wide range of cellular processes, including the synthesis of neurotransmitters and DNA. SAMe also supports liver function and helps maintain healthy bones.
Methionine is found in a variety of protein-rich foods, including meat, fish, eggs, dairy products, and some plant-based sources like beans, nuts, and seeds. However, some plant-based sources of methionine, such as grains and legumes, may not be as bioavailable as animal sources. In addition, methionine is also available as a dietary supplement.
The recommended daily intake of methionine for adults is around 13-15 milligrams per kilogram of body weight per day. This translates to around 900-1200 milligrams per day for an adult weighing 70 kilograms (154 pounds).
Methionine deficiency is rare in healthy individuals who consume a balanced diet that includes animal-based protein sources. However, methionine deficiency can occur in individuals who follow a strict vegan or vegetarian diet that is low in methionine-rich foods.
Symptoms of methionine deficiency include muscle weakness, fatigue, and impaired cognitive function. Severe deficiency can lead to impaired growth and development in infants and children.
Excessive intake of methionine can lead to health problems, including an increased risk of cardiovascular disease, liver damage, and kidney stones. High levels of methionine can also increase the production of homocysteine, an amino acid linked to an increased risk of heart disease and stroke.
Most people can obtain adequate amounts of methionine through a balanced diet that includes animal-based protein sources. However, methionine supplements may be recommended for individuals who follow a strict vegan or vegetarian diet that is low in methionine-rich foods or for those with certain health conditions.
Methionine is commonly used in the production of animal feed to enhance growth and meat quality.
Methionine is the starting amino acid for protein synthesis in most organisms.
Methionine is important for the production of the neurotransmitter dopamine, which plays a role in motivation, reward, and pleasure.
This list shows food that are top sources of Methionine and the quantity of Methionine in 100g of food