Selenium is an essential trace mineral necessary for the proper functioning of the human body. Unfortunately, it is not produced by our bodies and must be obtained from food. It is also present in soil and water. Selenium is packed with antioxidants, but it is also reported to reduce the risk of certain cancers, help mitigate mental decline, and prevent heart diseases. It also ensures the proper functioning of thyroid glands. But One Organ Is Particularly At RiskOne organ that is particularly susceptible to selenium deficiency is your heart. A potentially fatal heart disease called Keshan Disease is linked to the deficiency of this essential mineral. It makes your heart muscles enlarge and weak. This can lead to heart failure, cardiomegaly, arrhythmias, and acute cardiac episodes. The symptoms of Keshan's disease include dizziness, fatigue and heart palpitations. Besides the heart, Selenium also impacts other muscles such as thyroid gland, your immune system and the brain. Selenium is necessary for converting inactive thyroid hormone (T4) into its active form (T3). Deficiency can lead to hypothyroidism. Chronic deficiency can lead to serious conditions like Hashimo's thyroiditis.A deficiency of this essential mineral can cause of myopathy, which makes muscles weak. This can manifest itself in difficulty in performing pysical tasks or muscle pain. Lack of Slenium also impacts immunity and the body's response to foreign pathogens. This could lead to more infections. This can impair the function of white blood cells, reducing the body's ability to fight off pathogens. A deficiency of this element can cause serious neurogenerative diseases like Alzheimer's. Actually, this element reduces oxidative stress in the brain. Oxiidative stress occurs hen when the body has too many unstable molecules called free radicals that can damage the function of the organs.Here are some foods that are excellent sources of selenium:- Brazil nuts(highest source of selenium)- Seafood (such as tuna, shrimp, salmon, sardines, and halibut)- Poultry(chicken, turkey)- Eggs- Brown rice- Whole wheat bread- Sunflower seeds- Mushrooms(especially shiitake)- Spinach- Garlic- Cottage cheese- Oats- Liver (beef or chicken)