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There are scant data on serum lipid profile in the Yi people in China. The Yi farmers and migrants provide an unusual opportunity to estimate effects of environmental factors on serum lipid levels. We conducted a cross-sectional study in the Yi people to estimate prevalence of dyslipidemia and associated factors. It was found that prevalence of high total cholesterol (TC), triglyceride (TG), low-density lipoprotein-cholesterol (LDL-C), abnormal ratio of TC/HDL-C and low high-density lipoprotein-cholesterol (HDL-C) were 1.82%, 5.07%, 1.56%, 9.30% and 39.47%, respectively in the Yi farmers. And those in the Yi migrants were 4.81%, 22.21%, 3.24%, 26.56% and 40.53%. Prevalence of dyslipidemia increased with time period in the Yi farmers after their emigrating to urban areas for less than 25 years, except high TC. It was also found that prevalence of dyslipidemia of the Yi migrants increased with time period before their emigration, including hypertriglyceridemia, low HDL-C and high ratio of TC/HDL-C. Their body mass index (BMI), history of type 2 diabetes mellitus (T2DM), gender, ever alcohol drinking and physical activity all were associated with dyslipidemia, but no factors associated with high LDL-C was found. In conclusion, all these results suggest that the Yi migrants have a higher prevalence of dyslipidemia than the Yi farmers do, which possibly can attribute to their urbanized lifestyles., (Copyright © 2012 Elsevier Ireland Ltd. All rights reserved.)

Objective: To evaluate trends of overweight and obesity prevalence between 1996 and 2007 in Yi farmers and Yi migrants., Methods: An Yi migrant study was conducted in Liangshan Yi Autonomous Prefecture, Sichuan Province, China from 1996 to 2007. Data were collected with identical methods, including standardized questionnaire and body measurements., Results: Age- and sex-specific body mass index (BMI) significantly increased from 20.02 in 1996 to 22.36 in 2007, among Yi farmers, which was significantly different from those among Yi migrants (23.67 in 2007 and 20.90 in 1996) (P<0.05). Prevalence of obesity rose from 1.21 % in 1996 to 4.55 % in 2007 (OR=1.15, P<0.001) in Yi migrants, while that in Yi farmers from none in 1996 to 0.12 % in 2007 (P>0.05). Prevalence of overweight rose significantly to 26.24 % in 2007 from 17.24 % in 1996 (OR=1.06, P<0.001) in Yi migrants, while that in Yi farmers from 1.29 % in 1996 to 4.45 % in 2007 (OR=1.14, P>0.001). Yi migrants appeared to have a 5.52-fold higher risk on developing overweight and obesity than Yi farmers have., Conclusion: The Yi migrants had a steeper increase of overweight with year and consequently caused more obesity. Change in lifestyle may contribute most likely to higher prevalence of overweight and obesity in Yi migrants., (Copyright © 2011 The Editorial Board of Biomedical and Environmental Sciences. Published by Elsevier B.V. All rights reserved.)