Carrot Benefits: Vitamin A, Eyesight Myths and Why Whole Carrots Beat Pills
Carrots are a staple in vegan and vegetarian kitchens, and for good reason. My original post listed five benefits, and some of them need a correction, so here is the evidence.
Do carrots improve your eyesight?
Not in the way the old post suggested. The American Academy of Ophthalmology lists the idea that eating carrots will improve your vision as a common eye myth. The truth behind it is that vitamin A is essential for healthy eyesight, and carrots have high amounts of it. Vitamin A deficiency can cause night blindness, but it is rare in the United States, and carrots will not give you better vision than a healthy person already has.
How much vitamin A is in a carrot?
Carrots contain beta-carotene, which your body turns into vitamin A. The NIH explains that 12 micrograms of dietary beta-carotene equal 1 microgram of vitamin A (RAE). According to USDA data, a medium raw carrot (61 grams) provides about 510 micrograms RAE. Women need 700 micrograms a day, and men 900, so one medium carrot covers roughly three-quarters of a woman’s daily need.
Do you need vitamin pills if you eat carrots?
No, and the old post was right about that. You can meet your vitamin A needs with food, and it is safer. The NIH reports that two large trials found beta-carotene supplements increased the risk of lung cancer in smokers, by 18 percent in one trial and 28 percent in the other, which also included former smokers and asbestos-exposed workers. Talk to your doctor before taking beta-carotene pills if you smoke or have smoked. Our post on antioxidant foods explains why colorful vegetables beat supplements.
Does carrot juice fight cancer or slow aging?
The old post claimed that carrot juice has anti-cancer properties, that beta-carotene slows aging and that carrots are good for the skin. I could not find solid evidence for those claims, so I have dropped them. Juice also has less fiber than the whole vegetable: USDA FoodData Central lists 0.8 grams per 100 grams for canned carrot juice and 2.8 grams for raw carrots. A glass of carrot juice is a fine drink, but it is not a miracle substitute for water or for eating the whole thing. If you want more advice on vitamins from food, see vitamin deficiency: who is at risk.