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Vitamin D is a group of structurally related, fat-soluble compounds responsible for increasing intestinal absorption of calcium, magnesium, and phosphate, along with numerous other biological functions. [1] [2] In humans, the most important compounds within this group are vitamin D 3 (cholecalciferol) and vitamin D 2 (ergocalciferol). [2] [3]
This leads to a multiple vitamin deficiency, affecting the fat-soluble vitamin A, vitamin D, vitamin E, and vitamin K. [11] However, many of the observed effects are due to vitamin E deficiency in particular. [11] Acanthocytosis in a patient with abetalipoproteinemia. Signs and symptoms vary and present differently from person to person.
Specific vitamins like vitamin D or micronutrient like zinc levels can be checked. Fat soluble vitamins (A, D, E and K) are affected in fat malabsorption. Prolonged prothrombin time can be caused by vitamin K deficiency. [citation needed] Serological studies. Specific tests are carried out to determine the underlying cause.
New research suggests that supplementing with vitamin D may reduce the risk of heart attacks and other cardiovascular events. Scientists Reveal New Findings About Older Adults Who Take Vitamin D ...
Water-soluble vitamins dissolve easily in water and, in general, are readily excreted from the body, to the degree that urinary output is a strong predictor of vitamin consumption. [47] Because they are not as readily stored, more consistent intake is important. [48] Fat-soluble vitamins are absorbed through the gastrointestinal tract with the ...
The Vitamin-B complex, which includes eight water-soluble vitamins, plays a crucial role in maintaining cellular function and preventing brain atrophy. Among the elderly, deficiencies in vitamins B12, B6, and folate are linked to cognitive decline and depressive symptoms. [173]
Preformed vitamin A is fat-soluble and high levels have been reported to affect the metabolism of the other fat-soluble vitamins D, [24] E, and K. The toxic effects of preformed vitamin A might be related to altered vitamin D metabolism, concurrent ingestion of substantial amounts of vitamin D, or binding of vitamin A to receptor heterodimers ...
Some vitamins cause acute or chronic toxicity, a condition called hypervitaminosis, which occurs mainly for fat-soluble vitamins if over-consumed by excessive supplementation. Hypervitaminosis A [59] and hypervitaminosis D [60] are the most common examples.
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