Does melanin have anti-aging effect? The color of black rice is different from other rice, mainly because its outer cortex contains anthocyanins, which has a strong anti-aging effect. Studies at home and abroad show that the darker the color of rice is, the stronger the anti-aging effect of epidermal pigment is, and the effect of black rice pigment is the strongest among all kinds of rice. In addition, this pigment is also rich in flavonoids active substances, which is five times that of white rice, and plays a great role in preventing arteriosclerosis. The content of B vitamins in black rice is about 4 times that of polished rice. The contents of trace elements such as potassium, magnesium, iron, zinc and manganese are 4.4 times, 6 times, 1.7 times, 3.8 times and 1.7 times respectively. The content of lysine is 2-2.5 times that of lysine. Since ancient times, black rice has been regarded as a nourishing health product. The "Yutian rouge rice" mentioned in A Dream of Red Mansions refers to purple-black blood glutinous rice. Traditional Chinese medicine believes that black rice has the functions of nourishing yin and tonifying kidney, strengthening spleen and warming liver, improving eyesight and promoting blood circulation, and can treat anemia, dizziness, premature gray hair and other diseases. Because black rice contains more dietary fiber, the digestion speed of starch is relatively slow, and the glycemic index is only 55 (87 for white rice). Therefore, eating black rice will not cause violent fluctuations in blood sugar like eating white rice. In addition, minerals such as potassium and magnesium in black rice are also beneficial to control blood pressure and reduce the risk of cardiovascular and cerebrovascular diseases. Therefore, diabetics and patients with cardiovascular diseases can eat black rice as part of their diet.