![]() Tryptophan deficiency can cause a condition called pellagra, which can lead to dementia, skin rashes, and digestive issues. One study indicates that tryptophan supplementation can improve mental energy and emotional processing in healthy women. Tryptophan is a sedative, and it is an ingredient in some sleep aids. Serotonin is a neurotransmitter that regulates appetite, sleep, mood, and pain. ![]() Tryptophan is necessary for proper growth in infants and is a precursor of serotonin and melatonin. As a result, they should avoid consuming foods that contain high levels of this amino acid. People with a rare genetic disorder called phenylketonuria (PKU) are unable to metabolize phenylalanine. Large doses of aspartame can increase the levels of phenylalanine in the brain and may cause anxiety and jitteriness and affect sleep. Phenylalanine is often in the artificial sweetener aspartame, which manufacturers use to make diet sodas. It may also cause eczema, fatigue, and memory problems in adults. Phenylalanine deficiency, though rare, can lead to poor weight gain in infants. The body converts phenylalanine to tyrosine, which is necessary for specific brain functions. Phenylalanine helps the body use other amino acids as well as proteins and enzymes. Share on Pinterest Some diet sodas contain sweeteners with phenylalanine. Leucine deficiency can lead to skin rashes, hair loss, and fatigue. It is also necessary for wound healing and the production of growth hormone. Leucine helps regulate blood sugar levels and aids the growth and repair of muscle and bone. This deficiency may cause muscle wasting and shaking. Older adults may be more prone to isoleucine deficiency than younger people. It is primarily present in muscle tissue and regulates energy levels. Isoleucine helps with wound healing, immunity, blood sugar regulation, and hormone production. People may use valine supplements for muscle growth, tissue repair, and energy.ĭeficiency may cause insomnia and reduced mental function. Valine is essential for mental focus, muscle coordination, and emotional calm. It aids the proper absorption of selenium and zinc and the removal of heavy metals, such as lead and mercury. Methionine and the nonessential amino acid cysteine play a role in the health and flexibility of skin and hair. It helps aid fat metabolism and may be beneficial for people with indigestion, anxiety, and mild depression.Ī 2018 study found that threonine deficiency in fish led to these animals having a lowered resistance to disease. Threonine is necessary for healthy skin and teeth, as it is a component in tooth enamel, collagen, and elastin. The results of a study that recruited women with obesity and metabolic syndrome suggest that histidine supplements may lower BMI and insulin resistance.ĭeficiency can cause anemia, and low blood levels appear to be more common among people with arthritis and kidney disease. The body metabolizes histidine into histamine, which is crucial for immunity, reproductive health, and digestion. It also helps maintain the special protective covering over nerve cells, which is called the myelin sheath. Histidine facilitates growth, the creation of blood cells, and tissue repair. There is not a lot of research available on lysine deficiency, but a study on rats indicates that lysine deficiency can lead to stress-induced anxiety. Lysine plays a vital role in building muscle, maintaining bone strength, aiding recovery from injury or surgery, and regulating hormones, antibodies, and enzymes. There are many types of essential amino acids, including: Lysine Share on Pinterest High protein foods, such as tofu and quinoa, contain amino acids.
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