vitamin A deficiency Archives - Healthhype https://healthhype.com/tag/vitamin-a-deficiency Current Health Articles on Symptoms, Diseases and Treatment Wed, 17 Feb 2016 23:07:18 +0000 en-US hourly 1 https://healthhype.com/wp-content/uploads/logoicon.png vitamin A deficiency Archives - Healthhype https://healthhype.com/tag/vitamin-a-deficiency 32 32 Night Blindness (Nyctalopia) Causes, Symptoms, Treatment https://healthhype.com/night-blindness-nyctalopia-causes-symptoms-treatment.html https://healthhype.com/night-blindness-nyctalopia-causes-symptoms-treatment.html#respond Sun, 13 Sep 2015 23:02:49 +0000 http://www.healthhype.com/?p=30818 Most of us hear about night blindness being a problem with vitamin deficiencies, and specifically a vitamin A deficiency. However, this is an uncommon cause of a relatively common problem. Despite its name, a person does not go blind (complete loss of vision) at night. Instead it refers to a difficulty with sight at night which is a common symptom of many different eye and vision conditions. What is night blindness? Night blindness, also known by the medical term nyctalopia, is a condition where the eyesight is poor in dimly lit environments. This is most obvious at night. However, even being in a poorly lit room during the day with no significant natural or artificial light sources can equally be a problem. While humans do not have very good night vision as compared to certain species of mammals, in night blindness there is a significant and abnormal impairment of eyesight at night. Causes of Night Blindness How does night blindness occur? Light from an object enters the eye and is bent first by the cornea and then by the lens to focus an image on the light-sensitive tissue known as the retina. Specialized receptors cells in the retina, known as [...]

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]]> https://healthhype.com/night-blindness-nyctalopia-causes-symptoms-treatment.html/feed 0 Vitamin A Deficiency Causes, Sources, Foods, Symptoms, Dose https://healthhype.com/vitamin-a-deficiency-causes-sources-foods-symptoms-dose.html https://healthhype.com/vitamin-a-deficiency-causes-sources-foods-symptoms-dose.html#respond Mon, 18 Jan 2016 23:05:23 +0000 http://www.healthhype.com/?p=31300 Despite the concern about the potential of vitamin A toxicity among people who use excessive amounts of supplements, it is possible to be deficient of vitamin A. This is mainly seen in the elderly, chronically ill and people who are malnourished. It is uncommon in the United States but is being seen more frequently among vegans, alcoholics, people who undergo small bowel bypass surgery and immigrants from developing countries¹. What is vitamin A deficiency? Vitamin A deficiency is a lack of sufficient vitamin A in the body to maintain health and prevent deficiency-related conditions like night blindness. Deficiencies also impair immune defenses and can affect the formation of blood cells. It also affects skin, hair and nail health. Vitamin A is a fat-soluble vitamin and can be stored in the body for long periods of time. Supplementation of these vitamins are therefore usually not necessary². Due to the possibility of toxicity, supplementation should be avoided in people who do not have a deficiency. A balanced diet will suffice for the daily vitamin A requirements. In fact vitamin A intake is not required daily due to the body’s ability to store vitamin A. The maximum daily dose is only exceeded when [...]

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