Carrots Improve Your Vision : How many carrots would be needed to optimize night vision remains less clear. Most studies have so far looked at the benefits of beta-carotene or vitamin A supplements, not carrots specifically. One randomized control study in 2005 examined how consumption of roughly 4.5 ounces of cooked carrots six days a week stacked up against other vitamin A–rich options such as fortified rice, amaranth leaf and goat liver for helping address night blindness in pregnant women. The result: all the foods performed roughly the same, although the vitamin A supplement did best of all. The study found that a regular diet of the cooked carrots for six weeks helped to bring women’s response to darkness to normal levels. (In Western nations about 30 percent of dietary vitamin A comes from beta-carotene but in some developing countries it is the sole source of vitamin A.)
