For the variety of sweet potatoes that are orange in colour, carotenoids are present. Carotenoid, a type of antioxidant, is the precursor to vitamin A in the body. Vitamin A is essential for healthy eyes, a boosted immunity, ward off cancer, and protects against the effects of ageing.
Several recent studies have shown the superior ability of sweet potatoes to raise blood levels of vitamin A. This benefit may be particularly true for children.
In numerous studies from Africa, sweet potatoes were found to contain between 100 and 1,600 microgrammes (RAE) of vitamin A in every 3.5 ounces—enough, on average, to meet 35 per cent of all vitamin A needs, and in many cases enough to meet over 90 per cent of vitamin A needs from this single food alone.