Brenda Khan
Selenium is a mineral found in the soil that plays a crucial role in metabolism and overall body health. It is an essential component of enzymes and offers antioxidant properties that protect cells from damage caused by ageing, lifestyle choices, and environmental factors like pollution. Selenium supports thyroid function, reproductive function, and DNA synthesis. Brazil nuts, seafood, meat, eggs, and grain products are good sources of selenium. While the body only requires a small amount, a deficiency can lead to autoimmune thyroid conditions, and an overdose may cause health issues.
| Characteristics | Values |
|---|---|
| Selenium's role in the body | Selenium is a trace mineral that supports whole-body health. |
| Amount needed | The body only needs a small amount of selenium. |
| Sources | Selenium is found naturally in some foods, including Brazil nuts, bananas, eggs, meat, seafood, and grain products. It is also available as a supplement. |
| Benefits | Selenium has antioxidant properties that protect cells from damage caused by aging, lifestyle choices, and environmental conditions. It also supports thyroid function, reproductive function, and DNA synthesis. |
| Risks of deficiency | Selenium deficiency can lead to autoimmune thyroid conditions such as Hashimoto's disease and Graves' disease. It may also be associated with an increased risk of CVD and other health problems. |
| Risks of excess | Excess selenium intake can lead to health problems, including muscle tremors, hair loss, stomach upset, lightheadedness, heart attack, respiratory distress, and kidney failure. |
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What You'll Learn
- Selenium is an essential mineral for whole-body health
- Selenium has antioxidant properties that protect cells from damage
- Selenium supports cognitive function and brain health
- Selenium is important for thyroid health and function
- Selenium is found naturally in many foods, including Brazil nuts, seafood, and meat
Selenium is an essential mineral for whole-body health
Selenium is a trace mineral, which means the body only needs a small amount of it to function well. It is found naturally in water, soil, and some foods, including meat, seafood, eggs, bananas, and grains. Brazil nuts are particularly rich in selenium, with just one nut containing almost twice the recommended daily amount.
This essential mineral has antioxidant properties, which means it helps protect cells from damage caused by ageing, lifestyle choices, and environmental conditions like pollution. Over time, this cell damage, called oxidative stress, is linked to cancer, heart disease, and the decline of mental skills. Selenium's antioxidant properties may help fight this cell damage, especially in the brain and nervous system, where it may help prevent or treat diseases like Parkinson's, Alzheimer's, and multiple sclerosis.
Selenium also supports thyroid function. The thyroid is a small gland that produces hormones to regulate the body's metabolic processes. Selenium helps convert thyroid hormones into their active form. If the body does not have enough selenium, it can lead to autoimmune thyroid conditions such as Hashimoto's disease and Graves' disease, resulting in an overactive or underactive thyroid. An underactive thyroid can cause fatigue, weight gain, depression, and muscle aches, and worsen chronic diseases over time.
In addition to its role in cell protection and thyroid function, selenium also promotes reproductive function and plays a role in DNA synthesis. While selenium is essential for whole-body health, it is important to moderate intake, as too much selenium can lead to health problems, including muscle tremors, hair loss, stomach upset, lightheadedness, and, in severe cases, heart attack, respiratory distress, or kidney failure. The recommended upper limit for selenium intake is 400 micrograms per day for adults.
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Selenium has antioxidant properties that protect cells from damage
Selenium is a mineral found in the soil that occurs naturally in water and some foods. It is an essential component of various enzymes. While people only need a small amount of selenium, it plays a crucial role in their metabolism and supports whole-body health.
Selenium has attracted attention due to its antioxidant properties, which protect cells from damage. Over time, cell damage, or oxidative stress, is linked to cancer, heart disease, and the decline of mental skills. Selenium's antioxidant properties fight this cell damage, which may worsen brain and nervous system diseases such as Parkinson's, Alzheimer's, and multiple sclerosis. Selenium supports healthy brain function, and studies are ongoing to determine if it can help prevent or treat the loss of mental skills.
Brazil nuts are the most powerful source of selenium available. Just one nut contains 68 to 95 micrograms, almost twice the daily requirement. Other good sources of selenium include seafood, meat, eggs, bananas, and grain products such as bread, pasta, and cereals.
It is important to note that taking too much selenium can lead to health problems. The safe upper limit for selenium is 400 micrograms a day for adults. Anything above this amount is considered an overdose and can lead to muscle tremors, hair loss, stomach upset, lightheadedness, and more severe outcomes such as heart attack and respiratory distress.
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Selenium supports cognitive function and brain health
Selenium is a mineral found in the soil that plays a crucial role in supporting cognitive function and brain health. It is a powerful antioxidant that helps protect cells in the body from damage caused by oxidative stress. Oxidative stress is linked to various brain and nervous system diseases, including Parkinson's, Alzheimer's, and multiple sclerosis.
The brain retains selenium longer than other organs, indicating its importance for the maintenance of physiological function in the central nervous system. Studies have shown a positive correlation between selenium levels and cognitive ability, with higher selenium levels associated with better cognitive performance.
Selenium may help prevent cognitive decline and protect against oxidative damage in the brain. It has been studied as a potential treatment for Alzheimer's disease due to its ability to interfere with amyloid and iron neurotoxicity and increase antioxidant levels in the brain. While selenium supplementation has not shown benefits for preventing or treating dementia in clinical trials, it may be beneficial for individuals already affected by Alzheimer's or mild cognitive impairment to maintain brain function.
Additionally, selenium supports thyroid health, which is crucial for regulating metabolic processes in the body. An underactive thyroid can lead to fatigue, weight gain, depression, and muscle aches.
Brazil nuts are an excellent source of selenium, with just one nut containing almost twice the recommended daily intake. Other good sources include seafood, meat, eggs, and grain products such as bread, pasta, and cereals. However, it is important to moderate your intake, as excessive selenium consumption can be toxic.
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Selenium is important for thyroid health and function
Selenium is a mineral found in the soil that plays a crucial role in maintaining thyroid health and function. The thyroid is a small gland that produces hormones to regulate metabolic processes in the body. An underactive thyroid can lead to various health issues, including fatigue, weight gain, depression, and muscle aches.
Selenium is essential for the production of thyroid hormones and the regulation of their levels. It helps ensure that thyroid hormone levels are neither too low nor too high. For example, enzymes composed of selenium, called seleno-de-iodinases, maintain appropriate T3 levels in the thyroid, liver, kidney, and brain cells. Another enzyme, glutathione peroxidase, helps to limit T4 levels when they get too high.
A deficiency in selenium can impact the thyroid's ability to produce and regulate hormones, leading to potential health issues. Studies have shown that selenium supplementation can reduce thyroid peroxidase antibodies (TPO) and improve symptoms of hypothyroidism. Additionally, selenium supplements have been associated with improved outcomes for patients with mild to moderate thyroid eye disease (Graves' orbitopathy).
Selenium can be obtained through the diet by consuming foods such as Brazil nuts, seafood, eggs, meat, and grain products. However, it is important to moderate intake as excessive selenium can also negatively impact thyroid health. The recommended daily intake for adults is up to 200 micrograms, and doctors advise not exceeding 400 micrograms per day to avoid potential health risks.
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Selenium is found naturally in many foods, including Brazil nuts, seafood, and meat
Selenium is a mineral found in the soil that occurs naturally in water and some foods. It is essential for the body to function well, but the body cannot produce it on its own. Thus, it must be obtained through diet. Selenium is found naturally in many foods, including Brazil nuts, seafood, and meat.
Brazil nuts are one of the best sources of selenium. A single Brazil nut can contain about 68-95 mcg of selenium, almost twice the recommended daily intake. Eating just one or two Brazil nuts a few times a week can fulfill your daily selenium requirement. However, it is important to moderate your portions as consuming too many Brazil nuts daily can lead to selenium toxicity.
Seafood is another excellent source of selenium. Yellowfin tuna, halibut, sardines, and shrimp are particularly rich in selenium. A 3-ounce serving of yellowfin tuna or white fish like halibut contains about 92 mcg of selenium, while tinned sardines provide 45 mcg in the same portion size.
Meat is also a good natural source of selenium. Chicken, especially the skin, is a notable source. A sautéed chicken breast can provide up to 35 mcg of selenium, and the skin contains an additional 5 mcg. Lean beef varieties, such as skirt steak, are also recommended. A 4-ounce serving of skirt steak provides 26 mcg of selenium. Organ meats, in particular, are high in selenium, although their consumption is usually limited due to health concerns related to their high saturated fat content.
In addition to the above-mentioned food sources, selenium is also present in eggs, bananas, and grain products like bread, pasta, and cereals.
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Frequently asked questions
Selenium is an essential mineral that supports whole-body health. It is a trace mineral, meaning the body only needs a small amount of it. Selenium has antioxidant properties and may help protect cells from damage caused by things like aging, lifestyle choices, and environmental conditions like pollution.
Brazil nuts are one of the best sources of selenium. Just one nut contains 68-95 micrograms, almost twice your daily requirement. Other good sources of selenium include seafood (especially yellowfin tuna, halibut, sardines, and shrimp), eggs, bananas, meat, and grain products such as breads, pastas, and cereals.
The amount of selenium you need can vary depending on your individual needs and health conditions. The recommended dietary allowance (RDA) for selenium includes the total amount you should get from foods and supplements. Most people can get their RDA of selenium from food alone. The safe upper limit for selenium is 400 micrograms per day for adults, and anything above that is considered an overdose.
