I believe most of us, since we were young, are stuffed with carrots and carrots and carrots. Especially us who need the help of specs, our mom will just stuff more carrots down our throats. And we will most likely continue this habit to our children. Well, probably you won't do it anymore after reading this.
A major Australian study called the Blue Mountains eye study, examined the link between increased vitamin A consumpiton and deteriorating night vision in older people. This study was conducted in late 1990s. The results was that the vitamin A intake didn't improve their eyesight.
This is also supported by Professor Algis Vingrys, from the University of Melbourne's Department of Optometry and Vision Services. According to him, if you already have a well balanced diet, no amount of carrots will improve your eyesight. The balanced diet should contain sufficient vitamin A, iron and other provitamins i.e. substances that our bodies can convert into vitamins.
There are two types of vitamin A: retinoids and carotenoids.
Retinoids are a lipid form of vitamin A found in liver, fish oils containing liver (e.g. cod-liver oil) and butter. However you should be careful in consuming these, as overdosing can lead to toxicity, or worse, promote some forms of cancer.
Carotenoids are provitamins your body converts into vitamin A. These can be found in carrots, broccoli, sweet potatoes, pumpkin and dark-green leafy vegetables all contain beta-carotene, a potent carotenoid. But if you already have enough vitamin A, your body will not convert these into vitamin A. This is why it is said earlier that no amounts of carrots will improve your eyesight.
So after all, the important thing is to have a balanced diet, and you do not have to worry nomore about consuming certain amount of carrots everyday.
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