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Vitamin A

Contents


About Vitamin A

Warning
As vitamin A is fat-soluble, disposing of any excesses taken in through diet is much harder than with water-soluble vitamins. vitamin A toxicity is possible and it is suggested that people with IBD don't supplement vitamin A unless your levels are tested, shown to be deficient, and your doctor recommends you supplement. It is strongly suggested to have your vitamin D levels checked (and likely supplement vitamin D) before supplementing Vitamin A. Too much vitamin A while deficiency in vitamin D can lead vitamin D impairment.[1]

Vitamin A is commonly known as the anti-infective vitamin, because it is required for normal functioning of the immune system. The skin and mucosal cells (cells that line the airways, digestive tract, and urinary tract) function as a barrier and form the body's first line of defense against infection. Retinol and its metabolites are required to maintain the integrity and function of these cells. Vitamin A and retinoic acid (RA) play a central role in the development and differentiation of white blood cells, such as lymphocytes, which play critical roles in the immune response.[2]

Symptoms of Vitamin A Deficiency

Rough skin (especially on the heels)
Dry eyes
Night blindness
Diminished immune response
Xerophthalmia (reduced tear production)
Eye infection [3]
Reduced sense of smell[6]

Vitamin A deficiency has an adverse effect on hemoglobin synthesis, even a slight increase in vitamin A intake can lead to a significant rise in hemoglobin levels.

Supplementation of vitamin A in individuals with iron deficiency anemia alongside normal iron supplementation is shown to have significantly improved iron status than iron supplementation alone.[4]

Anatomy of Absorption

You are at increased risk of vitamin A deficiency if you have trouble absorbing fats or have inflammation in or surgical removal of the duodenum or upper jejunum.[5] In addition, iron deficiency can lead to reduced uptake of vitamin A, alcohol consumption can lead to depletion, and fighting infection utilizes significant amounts of vitamin A.

Recommended Daily Intake

Natural Sources of Vitamin A

* liver (beef, pork, chicken, turkey, fish) (6500 μg 722%)
* dandelion greens (5588 IU 112%)
* carrot (835 μg 93%)
* broccoli leaf (800 μg 89%)
* sweet potato (709 μg 79%)
* butter (684 μg 76%)
* kale (681 μg 76%)
* spinach (469 μg 52%)
* pumpkin (400 μg 41%)
* collard greens (333 μg 37%)
* Cheddar cheese (265 μg 29%)
* cantaloupe melon (169 μg 19%)
* egg (140 μg 16%)
* apricot (96 μg 11%)
* papaya (55 μg 6%)
* mango (38 μg 4%)
* pea (38 μg 4%)
* broccoli (31 μg 3%)
* milk (28 μg 3%)

References


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