Comparison Of Dietary Nutrients Intakes And Development Of Bone For Tibetan, Han, Qiang Nationalities Students Aged 7-18 Years In China And Study Of Dietary Influences On Bone

It's important to gain optimal bone strength during childhood and adolescence for prevention of osteoporosis later in life. Dietary is one of influenced factors on growth and development of bone. Different ethnic group has different life style and dietary behavior. The purpose of the study was to Compare the status of dietary and nutrition , level of bone growth and development of students of Tibetan, Han ,Qiang nationalities, in China. At the same time, ascertain which dietary factors influence their growth of bone change.By stratified random whole-group sampling, 1651 students aged 7-18 years were recruited in ABa Self-governing County of Sichuan Province in China. Dietary survey was performed with 24-hour food recall method for successive 3 days. The nutrients intakes and results of Dietary assessment were calculated and compared between three nationalities. Body height, sitting-height, forearm and lower leg length were measured. Bone mass of the non-dominant forearm was measured by dual energy X-ray absorptiometry (pDEXA).The results showed that the average energy intake for all subjects was inadequate and above 60% of students was below the RNI of energy. Energy was mainly from carbohydrate. Contribute rate of protein and fat in total energy were lower. Calcium intake of subjects is very low, which above 97% of them were below the AI and 63.2%-93.6% were below the 1/2 AI. The consumption of vitamin A , B₁, B₂, C and E were all lower. The extent of nutrients shortage had an increased trend with age. Compared with the Han and Qiang nationalities, the Tibetan subjects consumed the most carbohydrate and the lowest other nutrients. By DBI method, the dietary results showed that Tibetan subjects were higher in extent of excessive intake of grain and insufficient intake of all other foods group.Anthropometric indices of Tibetan subjects were higher than those of Qiang and Han, especially in 7-9 and 17-18 year-old groups. Compared with national data, the body height of Tibet groups were below the level of city and above that of rural area, and that of the Qiang and Han groups were at the same level of rural area. Except the 9-year-old boys and 7-year-old girls in Tibet groups, the average...