This benefit may be particularly true for children.
In several studies from Africa, sweet potatoes were found to contain between 100-1,600 micrograms (RAE) of vitamin A in every 3.5 ounces—enough, on average, to meet 35% of all vitamin A needs, and in many cases enough to meet over 90% of vitamin A needs (from this single food alone).
That's because scientists have now identified the exact genes in sweet potatoes (Ib MYB1 and Ib MYB2) that get activated to produce the purple anthocyanin pigments responsible for the rich purple tones of the flesh.
Recent research has shown that a minimum of 3-5 grams of fat per meal significantly increases our uptake of beta-carotene from sweet potatoes.Particularly when passing through our digestive tract, they may be able to lower the potential health risk posed by heavy metals and oxygen radicals.For more details on purple-fleshed and orange-fleshed sweet potatoes, please see our Description section below.Some nutritional benefits from sweet potatoes simply may be easier to achieve if you use steaming or boiling as your cooking method.
Orange-fleshed sweet potatoes may be one of nature's unsurpassed sources of beta-carotene.Several recent studies have shown the superior ability of sweet potatoes to raise our blood levels of vitamin A.