Dr. Bahareh Moshtagh, NDVitamin A
๐๐ฉ๐ช๐ด ๐ช๐ฏ๐ง๐ฐ๐ณ๐ฎ๐ข๐ต๐ช๐ฐ๐ฏ ๐ด๐ฉ๐ฐ๐ถ๐ญ๐ฅ ๐ฃ๐ฆ ๐ถ๐ด๐ฆ๐ฅ ๐ต๐ฐ ๐ฆ๐ฅ๐ถ๐ค๐ข๐ต๐ฆ ๐บ๐ฐ๐ถ ๐ณ๐ข๐ต๐ฉ๐ฆ๐ณ ๐ต๐ฉ๐ข๐ฏ ๐ต๐ฐ ๐ช๐ฏ๐ฅ๐ช๐ท๐ช๐ฅ๐ถ๐ข๐ญ๐ญ๐บ ๐ต๐ณ๐ฆ๐ข๐ต. ๐๐ฐ๐ณ ๐ฉ๐ช๐จ๐ฉ ๐ฅ๐ฐ๐ด๐ฆ๐ด ๐ฐ๐ง ๐ท๐ช๐ต๐ข๐ฎ๐ช๐ฏ ๐ ๐ฑ๐ญ๐ฆ๐ข๐ด๐ฆ ๐ค๐ฐ๐ฏ๐ด๐ถ๐ญ๐ต ๐ธ๐ช๐ต๐ฉ ๐ข๐ฏ ๐ฉ๐ฆ๐ข๐ญ๐ต๐ฉ ๐ฑ๐ณ๐ฐ๐ง๐ฆ๐ด๐ด๐ช๐ฐ๐ฏ๐ข๐ญ.โฃ
โฃ Vitamin A is a fat soluble vitamin with a half-life of 75 days in the body. โฃ โฃ In dietary supplements, Vitamin A often comes in the form of: ๐ซ๐๐ญ๐ข๐ง๐ฒ๐ฅ ๐๐๐๐ญ๐๐ญ๐ ๐จ๐ซ ๐ซ๐๐ญ๐ข๐ง๐ฒ๐ฅ ๐ฉ๐๐ฅ๐ฆ๐ข๐ญ๐๐ญ๐ which are ๐ฉ๐ซ๐-๐๐จ๐ซ๐ฆ๐๐ and also exist in animal products; and ๐๐๐ญ๐ ๐๐๐ซ๐จ๐ญ๐๐ง๐ ๐ฐ๐ก๐ข๐๐ก ๐ข๐ฌ ๐ ๐ฉ๐ซ๐จ๐ฏ๐ข๐ญ๐๐ฆ๐ข๐ง ๐ and exists in plant based foods. you can also get a mixture of both in supplement form.โฃ โฃ ๐๐๐ญ๐ ๐๐๐ซ๐จ๐ญ๐๐ง๐ can be obtained from foods rich in carotenoids which are often colorful fruits and vegetables. โฃ โฃ Consumption of five servings of fruits and vegetables per day could provide 5.2 to 6 mg/day of provitamin A carotenoids (Lachance, 1997), which would contribute approximately 50 to 65 percent of the men's RDA for vitamin A.โฃ
โฃ ๐๐จ๐ฅ๐ ๐ข๐ง ๐ญ๐ก๐ ๐๐จ๐๐ฒ: vision, bone growth, reproduction, cell division and differentiation, immune system regulation, healing of the respiratory tract and its development, and gene transcription.โฃ โฃ ๐๐๐๐ข๐๐ข๐๐ง๐๐ฒ is rare however 35% of Canadians over 19 years of age have inadequate intakes. Some symptoms include: ๐๐ซ๐ฒ ๐ก๐๐ข๐ซ, ๐ฌ๐ค๐ข๐ง ๐๐ง๐ ๐๐ฒ๐๐ฌ; ๐๐ข๐ง๐ ๐๐ซ๐ง๐๐ข๐ฅ๐ฌ ๐ญ๐ก๐๐ญ ๐๐ซ๐๐๐ค, ๐๐๐๐ซ๐๐๐ฌ๐๐ ๐ซ๐๐ฌ๐ข๐ฌ๐ญ๐๐ง๐๐ ๐ญ๐จ ๐ข๐ง๐๐๐๐ญ๐ข๐จ๐ง๐ฌ (๐๐จ๐ง๐ฌ๐ญ๐๐ง๐ญ๐ฅ๐ฒ ๐ฌ๐ข๐๐ค ๐จ๐ซ ๐๐๐ฌ๐ข๐ฅ๐ฒ ๐ ๐๐ญ๐ฌ ๐ฌ๐ข๐๐ค), ๐ง๐ข๐ ๐ก๐ญ ๐๐ฅ๐ข๐ง๐๐ง๐๐ฌ๐ฌ, ๐ ๐ซ๐จ๐ฐ๐ญ๐ก ๐ซ๐๐ญ๐๐ซ๐๐๐ญ๐ข๐จ๐ง, ๐ข๐ฆ๐ฉ๐๐ข๐ซ๐๐ ๐๐๐ข๐ฅ๐ข๐ญ๐ฒ ๐ญ๐จ ๐ฉ๐ซ๐จ๐๐ฎ๐๐ ๐ฌ๐ฉ๐๐ซ๐ฆ, ๐๐จ๐ฅ๐ฅ๐ข๐๐ฎ๐ฅ๐๐ซ ๐ก๐ฒ๐ฉ๐๐ซ๐ค๐๐ซ๐๐ญ๐จ๐ฌ๐ข๐ฌ ๐จ๐ ๐ญ๐ก๐ ๐ฌ๐ค๐ข๐ง, ๐๐ง๐ ๐๐๐ง๐. A number of factors can influence the requirement for vitamin A, including iron status, the presence and ๐ฌ๐๐ฏ๐๐ซ๐ข๐ญ๐ฒ ๐จ๐ ๐ข๐ง๐๐๐๐ญ๐ข๐จ๐ง ๐๐ง๐ ๐ฉ๐๐ซ๐๐ฌ๐ข๐ญ๐๐ฌ, ๐ญ๐ก๐ ๐ฅ๐๐ฏ๐๐ฅ ๐จ๐ ๐๐ข๐๐ญ๐๐ซ๐ฒ ๐๐๐ญ, ๐ฉ๐ซ๐จ๐ญ๐๐ข๐ง ๐๐ง๐๐ซ๐ ๐ฒ ๐ฆ๐๐ฅ๐ง๐ฎ๐ญ๐ซ๐ข๐ญ๐ข๐จ๐ง, ๐๐ง๐ ๐ญ๐ก๐ ๐๐ฏ๐๐ข๐ฅ๐๐๐ฅ๐ ๐ฌ๐จ๐ฎ๐ซ๐๐๐ฌ ๐๐จ๐ซ ๐ฉ๐ซ๐๐๐จ๐ซ๐ฆ๐๐ ๐ฏ๐ข๐ญ๐๐ฆ๐ข๐ง ๐ ๐๐ง๐ ๐ฉ๐ซ๐จ๐ฏ๐ข๐ญ๐๐ฆ๐ข๐ง ๐ ๐๐๐ซ๐จ๐ญ๐๐ง๐จ๐ข๐๐ฌ. ๐๐ก๐ ๐ฎ๐ซ๐ข๐ง๐๐ซ๐ฒ ๐๐ฑ๐๐ซ๐๐ญ๐ข๐จ๐ง ๐จ๐ ๐ฏ๐ข๐ญ๐๐ฆ๐ข๐ง ๐ ๐ข๐ฌ ๐ข๐ง๐๐ซ๐๐๐ฌ๐๐ ๐ฐ๐ข๐ญ๐ก ๐ข๐ง๐๐๐๐ญ๐ข๐จ๐ง, ๐๐ง๐ ๐๐ฌ๐ฉ๐๐๐ข๐๐ฅ๐ฅ๐ฒ ๐ฐ๐ข๐ญ๐ก ๐๐๐ฏ๐๐ซ (๐๐ฅ๐ฏ๐๐ซ๐๐ณ ๐๐ญ ๐๐ฅ., ๐๐๐๐; ๐๐ญ๐๐ฉ๐ก๐๐ง๐ฌ๐๐ง ๐๐ญ ๐๐ฅ., ๐๐๐๐). ๐ ๐จ๐ซ ๐ญ๐ก๐๐ฌ๐ ๐ซ๐๐๐ฌ๐จ๐ง๐ฌ, ๐ฐ๐ข๐ญ๐ก ๐ฉ๐๐ซ๐๐ฌ๐ข๐ญ๐ข๐ ๐ข๐ง๐๐๐ฌ๐ญ๐๐ญ๐ข๐จ๐ง ๐๐ง๐ ๐๐ฎ๐ซ๐ข๐ง๐ ๐ข๐ง๐๐๐๐ญ๐ข๐จ๐ง, ๐ญ๐ก๐ ๐ซ๐๐ช๐ฎ๐ข๐ซ๐๐ฆ๐๐ง๐ญ ๐๐จ๐ซ ๐ฏ๐ข๐ญ๐๐ฆ๐ข๐ง ๐ ๐ฆ๐๐ฒ ๐๐ ๐ ๐ซ๐๐๐ญ๐๐ซ ๐ญ๐ก๐๐ง ๐ญ๐ก๐ ๐ซ๐๐ช๐ฎ๐ข๐ซ๐๐ฆ๐๐ง๐ญ๐ฌ ๐ฌ๐๐ญ ๐ข๐ง ๐ญ๐ก๐ข๐ฌ ๐ซ๐๐ฉ๐จ๐ซ๐ญ, ๐ฐ๐ก๐ข๐๐ก ๐๐ซ๐ ๐๐๐ฌ๐๐ ๐จ๐ง ๐ ๐๐ง๐๐ซ๐๐ฅ๐ฅ๐ฒ ๐ก๐๐๐ฅ๐ญ๐ก๐ฒ ๐ข๐ง๐๐ข๐ฏ๐ข๐๐ฎ๐๐ฅ๐ฌ.โฃ
๐๐จ๐ฌ๐๐ ๐:
โฃ ๐๐๐: Serum retinolโฃ โฃ ๐๐จ๐ฉ๐ฎ๐ฅ๐๐ญ๐ข๐จ๐ง๐ฌ ๐๐ญ ๐ซ๐ข๐ฌ๐ค: individuals from developing countries, people with crohnโs disease, celiac disease, pancreatic diseases.โฃ โฃ ๐๐จ๐ฑ๐ข๐ ๐๐จ๐ฌ๐๐ฌ: 10,000 units a day daily can cause liver toxicity, birth defects, nausea, vomiting, altered mental status, abdominal pain, blurred vision, headache, muscle pain, weakness, increase in fracture risk, and can cause toxicity in alcoholics. Toxicity does not have to present symptoms. โฃ
For more information on vitamin A and other health benefits check out the following:
๐๐๐๐๐ซ๐๐ง๐๐๐ฌ:โฃ โข Dietary Reference Intakes for Vitamin A, Vitamin K, Arsenic, Boron, Chromium, Copper, Iodine, Iron, Manganese, Molybdenum, Nickel, Silicon, Vanadium, and Zinc. Institute of Medicine (US) Panel on Micronutrients. Washington (DC): National Academies Press (US); 2001.โฃ โข Compendium of Therapeutic Choices. Canadian Pharmacists Association; P.2014; 2018.โฃ