**About the Editor**

#### **Yunxian Yu**

Yunxian Yu is a professor and doctoral supervisor at the Zhejiang University School of Public Health. The main research area of Prof. Yu is the genetic and molecular epidemiology research of pregnancy complications, fetal and child health. More than 110 SCI papers have been published by Prof. Yu and his work contributes significantly to the research on maternal and child nutrition and health, especially in China. Among his research, his studies on Vitamin D during pregnancy and perinatal complications have made remarkable achievements. The recent research found that Vitamin D levels in pregnancy increased with the increase in gestational age, and the variation in Vitamin D pathway genes was an important factor affecting the level of Vitamin D in pregnant women. In addition, Vitamin D deficiency and overweight/obesity during pregnancy significantly increased gestational diabetes, gestational hypertension, anemia and preterm birth. At present, Prof. Yu is still devoting himself to the research of maternal and child health. His main current projects are listed as follows:

(1) National Natural Science Foundation of China: A Mendelian Randomized Study of Vitamin D and preterm prematurely ruptured membranes and its molecular mechanism.

(2) A multi-center randomized controlled study of vitamin D supplementation in pregnant women for prevention of gestational diabetes.

(3) National Key Research and Development Program of the 13th Five-Year Plan: Study on the Epidemiology and Monitoring and early Warning System of Metabolic Diseases of Childhood Obesity.

(4) National Key Research and Development Program of the 14th Five-Year Plan: Demonstration Study on the Pathogenesis and precise Prevention of metabolic diseases of Childhood Obesity.

(5) National Key Research and Development Program of the 14th Five-Year Plan: Construction and comprehensive evaluation of a new multilevel key technology system/demonstration base for the prevention and treatment of embryonic-derived diseases.
