Speaking of purple potato, it should not be strange. It is also called black potato and sweet potato. Sweet potato meat is purple or deep purple, which is a kind of sweet potato.

Nutritional value of purple sweet potato

Purple sweet potato is rich in nutrition, ranking first among 20 kinds of anti-cancer vegetables announced by the National Cancer Research Center of Japan. According to the ancient documents such as Compendium of Materia Medica, Supplement to Compendium of Materia Medica and Chinese Materia Medica, purple sweet potato is mild and sweet, which can strengthen the spleen and stomach, tonify the middle energizer, promote blood circulation, invigorate qi and promote fluid production, moisten the intestines and relieve constipation, and make people live longer and have fewer diseases. Purple sweet potato not only contains starch, vitamins A, B, C, E, carotene, dietary fiber, pectin, amino acid protein, calcium, iron, phosphorus, potassium, magnesium and other trace elements 10, but also contains anthocyanins and mineral selenium. The special health care effect of purple sweet potato also comes from these two components.

Efficacy and function of purple sweet potato

Lose weight and fat

The dietary fiber in purple potato swells with water to increase satiety, thus inhibiting appetite and reducing food intake. It can also delay the absorption of glucose and prevent sugar from being converted into fat. At the same time, purple potato is a low-fat and low-calorie food, which is beneficial to lose weight and shape, and is suitable for dieters to eat as a staple food.

Anti-wrinkle

Purple sweet potato contains a lot of anthocyanins, which is one of the main raw materials for extracting anthocyanins. Anthocyanin is known as the seventh essential nutrient for human body, which can prevent 100 diseases. It is a natural and powerful anti-aging agent, which can effectively eliminate human free radicals, prevent premature aging, black spot deposition, dermatitis, heart disease and arthritis caused by free radicals, and indirectly prevent cancer.

Prevention of constipation

Purple sweet potato contains a lot of dietary fiber and pectin, which is difficult to digest and absorb in the intestine, thus stimulating intestinal peristalsis, shortening the time of gastric emptying and food passing through the digestive tract, and discharging the residues left in the intestine, including some toxic and carcinogenic substances, enhancing the function of the digestive tract, effectively preventing constipation and preventing gastrointestinal diseases.

cancer prevention

Selenium, iron, iodine and molybdenum are called "four donkey kong" for cancer prevention, and the first three trace elements are all in purple potato. Iron is an important component of cancer prevention. Selenium is the king of cancer prevention and is known as the fire of life. It can scavenge free radicals that produce cancer cells, inhibit the synthesis of cancer cells, and affect the metabolism of chemical carcinogens, thus preventing the occurrence of cancers such as intestinal cancer, lung cancer and gastric cancer.

Protect eyesight

Anthocyanin in purple sweet potato has antioxidant effect, which can reduce the damage of free radicals to eyes. It can also enhance the elasticity of ocular microvasculature, promote blood circulation, improve eye fatigue and protect vision. At the same time, the carotene and vitamin A rich in purple potato can maintain the normal visual function of eyes.

Prevention of cardiovascular diseases

Purple sweet potato is rich in a mixture of polysaccharide and protein, which is similar to mucin in human mucus. This substance can maintain the patency and elasticity of human respiratory tract, digestive tract and blood vessels, avoid the accumulation of fat and other substances on blood vessel walls, and reduce the occurrence of atherosclerosis.

Matters needing attention in eating purple sweet potato

1, don't eat too much

Purple sweet potato contains oxidase, which can produce gas in gastrointestinal tract. If you eat too much, you will flatulence, burp, fart and feel uncomfortable.

2, heartburn

Purple sweet potato has a high sugar content, and the starch in purple sweet potato will also be converted into sugar, which will stimulate the gastric mucosa to secrete a lot of gastric acid, which is easy to heartburn and acid reflux. Especially don't eat purple potatoes on an empty stomach.

3, gastrointestinal patients should not eat more purple potatoes.

Purple sweet potato can stimulate gastric acid secretion, and patients with gastric ulcer, hyperacidity and indigestion will aggravate the condition.

4, purple potato should not be eaten with skin.

Purple sweet potato is easily polluted by black spot pathogen, which may cause poisoning after eating.

5, it is not appropriate to eat raw purple potatoes.

Purple sweet potato has a high starch content, which is difficult to digest raw. Be sure to eat it while it is hot.

6, diabetic patients should not eat more purple potatoes.

Purple sweet potato is rich in starch and sugar, and its glycemic index is high, so diabetics should be careful to eat it.