Sweet potato, sweet potato and purple potato, which has higher nutritional value?

Every time I smell baked sweet potatoes in the street, I want to buy one and try it. But many people are surprised: Why are there only baked sweet potatoes on the street? Why are there no roasted purple potatoes and roasted sweet potatoes? What's the difference between these potatoes of different colors? Fan Zhihong, an associate professor in the Department of Nutrition and Food Safety, College of Food Science, China Agricultural University, pointed out that sweet potato, sweet potato and purple potato all belong to the sweet potato family, and each has its own advantages.

Sweet potato, also known as sweet potato, sweet potato and so on. It is an annual or perennial herb tuberous plant of Convolvulaceae. China is the largest producer of sweet potatoes in the world, accounting for 75.3% of the world's total output. What we eat every day is the root tuber of sweet potato. 20 14 experts from sweet potato research institute of Chinese academy of sciences compared and evaluated the main nutritional quality of sweet potato tubers with different flesh colors. Let's have a look!

White meat sweet potato (sweet potato): The root tuber of the starch "champion" sweet potato is light in color, high in starch content, dry in taste and light in sweetness. Because the starch content is high and the sugar content is low, the taste is not so sweet, and it is not very fragrant when baked, which is not suitable for baking. Generally speaking, compared with varieties of other colors, the health advantages of white meat sweet potato are not so obvious.

Tip: Because the starch content of sweet potato is high, it can't be converted into rice according to 4: 1, but according to 3: 1, so when you eat a piece of sweet potato, the amount of rice you eat that day will be reduced by 3/4.

Yellow-fleshed sweet potato (sweet potato): Carotenoid "Queen" Yellow-fleshed sweet potato is characterized by high sugar content and high sweetness. Because of the high sugar content, baked sweet potato tastes sweeter; Because there is not so much starch, the baked sweet potato tastes less dry and the texture is softer. Because of the high sugar content, the baked sweet potato has a strong aroma and a charming burnt flavor.

The yellow and orange of yellow-fleshed sweet potato are all derived from carotene. The yellower the color, the higher the carotene content. Among them, carotene and lutein have great effects on our human body: β -carotene in carotenoids can be converted into vitamin A in human body, which plays an important role in preventing vitamin A deficiency and protecting eyesight; α -carotene is beneficial to prevent cardiovascular and cerebrovascular diseases and cancer.

Lutein, also known as "plant lutein", is a kind of carotenoid, which is beneficial to the health of retina and heart. In addition, carotene and lutein can prevent many degenerative diseases caused by aging and aging. Tip: If you want to prevent cardiovascular disease and aging by taking carotenoids, eat more sweet potatoes.

Purple flesh sweet potato (purple potato): anthocyanin "king" Many people are familiar with purple potato, but there may still be misunderstandings about it: they think purple potato is genetically modified food or dyed. In fact, the purple color of purple sweet potato is not caused by transgenic or dyeing, but because it contains high anthocyanins.

Anthocyanin is a powerful antioxidant, which can protect the human body from free radical damage, and has the functions of anti-cancer, preventing cardiovascular and cerebrovascular diseases and protecting the liver. Anthocyanins can also delay brain aging and prevent and treat capillary diseases caused by diabetes. It can not only enhance cardiopulmonary function, but also prevent Alzheimer's disease.

Purple sweet potato is rich in dietary fiber, which is especially suitable for people with constipation. Dietary fiber is indispensable for a healthy diet and plays an important role in relaxing bowels and maintaining gastrointestinal function. At the same time, taking enough dietary fiber can also prevent cardiovascular diseases, diabetes and other diseases. Tips: Purple sweet potato is rich in anthocyanin and dietary fiber, and has obvious antioxidant, anti-aging and anti-constipation effects, especially suitable for middle-aged and elderly people.

Conclusion In short, different cooking methods can make the same sweet potato have different tastes. Sweet potato, purple potato and sweet potato have their own advantages, and friends can choose according to their physical condition.