Rickets (scientific nomenclature: rachitis; from Greek ῥαχίτηςrhakhítēs, meaning "in or of the spine" which was chosen as a back-formation, see Etymology), is a condition that results in weak or soft bones in children and may have either dietary-deficiency or genetic causes. Symptoms include bowed legs, stunted growth, bone pain, large forehead, and trouble sleeping. Complications may include bone deformities, bone pseudofractures and fractures, muscle spasms, or an abnormally curved spine. The analogous condition in adults is osteomalacia.
One can characterise a child who appears to suffer from rickets as rachitic.
Common side effects include constipation and nausea. When taken by mouth high blood calcium is uncommon. Calcium supplements, unlike calcium from dietary sources, appear to increase the risk of kidney stones. Adults generally require about a gram of calcium a day. Calcium is particularly important for bones, muscles, and nerves.
Mikhail Yuryevich Lermontov (/ˈlɛərməntɒf/LAIR-mən-tof, US also /-tɔːf/-tawf; Russian: Михаи́л Ю́рьевич Ле́рмонтов, IPA:[mʲɪxɐˈilˈjʉrʲjɪvʲɪtɕˈlʲerməntəf]; 15 October [O.S. 3 October] 1814 – 27 July [O.S. 15 July] 1841) was a Russian Romantic writer, poet and painter, sometimes called "the poet of the Caucasus", the most important Russian poet after Alexander Pushkin's death in 1837 and the greatest figure in Russian Romanticism. His influence on Russian literature is felt in modern times, through his poetry, but also his prose, which founded the tradition of the Russian psychological novel.
Lermontov grew up in Tarkhany and received excellent home education from his grandmother, nurturing his talents in languages, music, and painting. However, his health was fragile, and he suffered from scrofula and rickets. His grandmother's strict control caused him emotional turmoil, leading to his development as a lonely and introspective individual. In 1827, Lermontov moved to Moscow with his grandmother and joined the Moscow University's boarding school. He excelled academically and started to write poetry. By 1829, Lermontov had written notable poems. His literary career began to take shape, with his early works reflecting the influences of Alexander Pushkin and Lord Byron. Lermontov's early education included extensive travel to the Caucasus for his health, which greatly impressed him and influenced his work.
Vitamin D deficiency or hypovitaminosis D is a vitamin D level that is below normal. It most commonly occurs in people when they have inadequate exposure to sunlight, particularly sunlight with adequate ultraviolet B rays (UVB). Vitamin D deficiency can also be caused by inadequate nutritional intake of vitamin D; disorders that limit vitamin D absorption; and disorders that impair the conversion of vitamin D to active metabolites, including certain liver, kidney, and hereditary disorders. Deficiency impairs bone mineralization, leading to bone-softening diseases, such as rickets in children. It can also worsen osteomalacia and osteoporosis in adults, increasing the risk of bone fractures. Muscle weakness is also a common symptom of vitamin D deficiency, further increasing the risk of falls and bone fractures in adults. Vitamin D deficiency is associated with the development of schizophrenia.
Vitamin D can be synthesized in the skin under exposure to UVB from sunlight. Oily fish, such as salmon, herring, and mackerel, are also sources of vitamin D, as are mushrooms. Milk is often fortified with vitamin D; sometimes bread, juices, and other dairy products are fortified with vitamin D. Many multivitamins contain vitamin D in different amounts.
