Brenda Khan
Silica, or silicon, is an important dietary component that has been linked to several health benefits. While it is not considered essential, silica may promote bone health, improve skin, hair, and nail quality, and support overall wellness. With the modern diet's shift towards refined foods and reduced vegetable intake, silica intake has decreased, prompting interest in silica-rich foods and supplements. This paragraph will explore the sources and benefits of silica, providing insights into how individuals can increase their silica intake through diet for optimal health.
| Characteristics | Values |
|---|---|
| Recommended daily silica intake | 25 mg/day |
| Average silica intake in the Western diet | 19-31 mg of Si per day |
| Average silica intake in the American diet | 30 mg per day |
| Silica-rich foods | Soya/tofu, rice, seafood, beer, apples, beets, bell peppers, cherries, celery, corn, cucumbers, dandelion, dried beans, eggplant, figs, fish, grapes, honey, kelp, leafy vegetables, nettle, nuts, seeds, oranges, pumpkin, raisins, raw cabbage, root vegetables, soybeans, strawberries, tomatoes, whole grains, zeolite, alfalfa, bamboo, nettles, horsetail |
| Silica supplements | Monomethyl silanetriol (MMST), colloidal mineral Si, choline-stabilised orthosilicic acid (ChOSA), colloidal silica |
| Silica and bone health | Silicon may stimulate new bone growth and increase bone volume and bone mineral density |
| Silica and skin health | Silicon may improve the structural integrity of skin |
| Silica and hair health | Silicon may contribute to healthier hair |
| Silica and nail health | Silicon may improve nail health |
| Silica and wound healing | Silicon may support wound healing |
| Silica and Alzheimer's disease | Silica in drinking water may help prevent Alzheimer's disease |
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What You'll Learn
Vegetables are the richest source of silica
Vegetarians often have higher silicon intakes than meat-eaters because vegetables are the richest source of silica in human food. The highest amount of silica is found in the skin or peel of vegetables, especially those that grow underground, such as potatoes and beets. Other vegetables high in silica include leafy greens such as spinach, mustard greens, lettuce, and endives, as well as root vegetables like carrots, onions, and sweet potatoes.
Silica is also present in the fiber-like substances in some vegetables, such as the fibers emanating from the pit of mangoes and the fibers in celery. It is also found in the bran of whole grains, such as brown rice, and in the seeds of plants, such as almonds, peanuts, sunflower seeds, and flaxseeds.
In addition to vegetables, silica is also found in plant-based foods like dried beans (chickpeas, kidney beans), tofu, and fruits such as apples, cherries, and grapes. Beer is also a source of silica, providing around 4 mg of silica per 100 ml, which accounts for almost 25% of your daily intake.
Silica is important for connective tissue health, and it is believed to have benefits for skin, hair, nails, and bones. However, a clear function of silica in the human body has not yet been established, and more evidence is needed to confirm its essential role in health.
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Beer is a good source of silica
The silicon content in beer depends on the type of beer and the malting and brewing processes used. Beers containing high levels of malted barley and hops, such as wheat beer, are richest in silicon as it is present in the barley husk. The mashing, rinsing, and filtration conditions during brewing also affect silicon levels, with filtration generally reducing silicon content. Additionally, the silicon levels in the water used for brewing can have a small influence on the final beer-silicon concentration.
The biological role of silicon is important for the health of connective tissue, especially bone. Silicon is a key ingredient for increasing bone mineral density, which may help prevent osteoporosis. This is why beer is often touted as being good for your bones. However, it is important to note that excessive beer consumption may be bad for your health.
To increase your silica intake through beer, opt for beers with high levels of malted barley and hops, such as wheat beer. Drink in moderation to contribute to your good health without negative consequences.
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Seafoods like mussels are high in silica
Seafood, including mussels, is a great source of silica. Mussels are a type of bivalve mollusc, which can be found in both saltwater and freshwater habitats. They are a highly valued food source worldwide, known for their rich nutritional content.
Mussels are a good source of silica, with around 2-3 mg of silica per 100 mg of mussel meat. They are also an excellent source of protein, containing all the essential amino acids. The protein in mussels is easily digestible, allowing the body to absorb the full benefits. In addition, mussels are rich in omega-3 fatty acids, particularly EPA and DHA, which are essential for maintaining a healthy heart. They also contain vitamins and minerals, including vitamin B12, which is necessary for the production of red blood cells, and iron, which helps prevent anemia.
Mussels are a versatile food and can be prepared in a variety of ways. They are commonly eaten steamed, boiled, or fried and are often served with white wine, herbs, and lemon. In Italy, they are mixed with other seafood, while in Spain, they are sometimes served with onion and boiling wine. Mussels can also be used in dishes such as rice, soup, or croquettes. When preparing mussels, it is important to cook them thoroughly to destroy any harmful bacteria or toxins that may be present.
In addition to their nutritional benefits, mussels are valuable to the ecosystem. They act as filter feeders, removing contaminants such as E. coli from the water, and can even be used to help manage nutrient pollution in coastal areas. However, it is important to be aware of the potential health risks associated with consuming mussels, such as shellfish poisoning paralysis during a red tide.
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Silicon is important for bone health
Silicon is an important mineral for bone health. It is a non-metallic element with an atomic weight of 28 and is the second most abundant element in the Earth's crust.
Silicon is present in plants as silica and soluble silicates and is bound to the cellulosic cell structure. It is commonly deposited in plants in the form of particles called phytoliths. Silica is primarily found in high amounts in foods that grow underground, such as potatoes and beets, with the highest amount in the skin. It is also present in the fiber-like substances in certain foods, such as the fibers emanating from the pit of mangoes and the fibers in celery. Additionally, silica is found in the bran of whole grains.
Silicon is suggested to be integrally bound to connective tissues and their components and to play a significant structural role. Silicon deprivation studies have reported detrimental effects on these tissues, indicating that it may be essential for normal growth and development in higher animals, including humans, primarily in the formation of bone and connective tissues. Animal studies in the 1970s reported that dietary silicon deficiency produced defects in connective and skeletal tissues.
Silicon is also important in the prevention and treatment of postmenopausal osteoporosis. Silicon improves bone matrix quality and facilitates bone mineralization. Increased intake of bioavailable silicon has been associated with increased bone mineral density. Silicon supplementation in animals and humans has been shown to increase bone mineral density and improve bone strength.
Some dietary sources of bioavailable silicon include whole grains, cereals, beer, and certain vegetables such as green beans.
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Silica is poorly absorbed by the intestines
Silica, or silicon, is an important dietary component for connective tissue health. It can be found in many foods, including plant-based and animal-based sources. A Western-type diet provides between 19 and 31 mg of silica per day, with the average American diet containing about 30 mg per day. Vegetarians tend to have higher silicon intakes than meat-eaters, as vegetables are the richest sources of silicon in human food.
However, it is important to note that silica is poorly absorbed by the intestines. This is because silica is present in plants as silica and soluble silicates, bound to the cellulosic cell structure. The bioavailability of silicon differs between food sources, with orthosilicic acid and water-soluble silicates from beverages being more easily absorbed (41%) than phytolytic silica, which is present in solid plant foods.
The absorption of silica also depends on the form it is ingested in. For example, monomeric silicates are more readily absorbed than particulate silicates, which are less well absorbed with increasing polymerisation. The absorption of silica is also influenced by the presence of other substances, such as magnesium trisilicate, which requires acid digestion for disaggregation. This slow process limits the opportunity for subsequent silicate dissolution.
Additionally, the particle size and surface properties of silica nanoparticles play a significant role in their absorption through the intestine. Studies in mice have shown that silica nanoparticles can be absorbed through the intestine, but the degree of absorption depends on factors such as particle diameter and surface characteristics.
While silica is poorly absorbed by the intestines, it is still possible to increase your silica intake through diet. Foods such as soya/tofu, rice, seafood, beer, and certain vegetables (e.g., beets, celery, leafy greens) are rich in silica.
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Frequently asked questions
Some silica-rich foods include soya/tofu, rice, seafood, beer, apples, beets, bell peppers, celery, leafy vegetables, nuts, seeds, root vegetables, and whole grains.
Silica is important for bone health and can help increase bone volume and bone mineral density. It may also improve the structural integrity of skin and contribute to healthier hair and nails.
A dietary silica intake of 25 mg/day, corresponding to ~10 mg/day of silicon, would be an adequate intake without adverse effects. On average, the American diet contains about 30 mg per day of silicon.
