This cross-sectional study aimed to examine the association between selenium levels and diabetes in an older population with life-long natural exposure to selenium in rural China. A total of 1856 subjects aged 65 year...This cross-sectional study aimed to examine the association between selenium levels and diabetes in an older population with life-long natural exposure to selenium in rural China. A total of 1856 subjects aged 65 years or older from four Chinese rural counties with different environmental selenium levels were evaluated. Analysis of covariance models and logistic regression models were used to examine the relationship between nail selenium levels and serum glucose, serum insulin, insulin resistance [using the Homeostatic Model Assessment for Insulin Resistance （HOMA-IR）], and the risk of diabetes. The mean nail selenium level was 0.461μg/g and the prevalence rate of diabetes was 8.3% in this population. The mean nail selenium level was significantly higher in the group with diabetes than in the group without diabetes （P〈0.0001）. The adjusted odds ratios for diabetes were 2.65 （95% Cl： 1.48 to 4.73）, 2.47 （95% CI： 1.37 to 4.45）, and 3.30 （95% Cl： 1.85 to 5.88） from the second selenium quartile to the fourth quartile, respectively, compared with the first quartile group. The mean serum glucose and HOMA-IR in the higher selenium quartile groups were significantly higher than those of the lowest quartile group. However, no significant differences in insulin were observed among the four quartile groups. A long-term, higher level of exposure to selenium may be associated with a higher risk of diabetes. Future studies are needed to elucidate the association between selenium and insulin resistance.展开更多
The contents of selenium in soil samples from Guizhou Province, which cover an area of 17.6×104 km2, have been determined. The arithmetic mean value of 947 samples is 0.39 mg/kg, the medium value is 0.30 mg/kg an...The contents of selenium in soil samples from Guizhou Province, which cover an area of 17.6×104 km2, have been determined. The arithmetic mean value of 947 samples is 0.39 mg/kg, the medium value is 0.30 mg/kg and the contents of selenium vary from 0.06 to 1.29 mg/kg in soils developed on the basement rocks, which are controlled by the basement rocks themselves.展开更多
Cognitive function in the elderly is affected by various environmental,social,and individual factors.Studies show that chemical trace elements are closely related to cognitive function.As a protective factor,selenium ...Cognitive function in the elderly is affected by various environmental,social,and individual factors.Studies show that chemical trace elements are closely related to cognitive function.As a protective factor,selenium promotes cognition in the elderly.However,study results into the effects of selenium on cognition have varied.By eliminating unstable environmental and other related factors,the present study selected elderly individuals from rural areas of the Shandong province to verify whether low selenium exposure is a risk factor for decreased cognitive function.Results demonstrated that age,sex,education,occupation,hypertension,stroke,and body selenium levels were factors affecting cognitive function in the elderly,and that selenium was an important protective factor.Moreover,results supported the hypothesis that a lifelong low selenium level is associated with low cognitive function.展开更多
基金supported by the United States National Institutes of Health(R01 AG019181)
文摘This cross-sectional study aimed to examine the association between selenium levels and diabetes in an older population with life-long natural exposure to selenium in rural China. A total of 1856 subjects aged 65 years or older from four Chinese rural counties with different environmental selenium levels were evaluated. Analysis of covariance models and logistic regression models were used to examine the relationship between nail selenium levels and serum glucose, serum insulin, insulin resistance [using the Homeostatic Model Assessment for Insulin Resistance （HOMA-IR）], and the risk of diabetes. The mean nail selenium level was 0.461μg/g and the prevalence rate of diabetes was 8.3% in this population. The mean nail selenium level was significantly higher in the group with diabetes than in the group without diabetes （P〈0.0001）. The adjusted odds ratios for diabetes were 2.65 （95% Cl： 1.48 to 4.73）, 2.47 （95% CI： 1.37 to 4.45）, and 3.30 （95% Cl： 1.85 to 5.88） from the second selenium quartile to the fourth quartile, respectively, compared with the first quartile group. The mean serum glucose and HOMA-IR in the higher selenium quartile groups were significantly higher than those of the lowest quartile group. However, no significant differences in insulin were observed among the four quartile groups. A long-term, higher level of exposure to selenium may be associated with a higher risk of diabetes. Future studies are needed to elucidate the association between selenium and insulin resistance.
文摘The contents of selenium in soil samples from Guizhou Province, which cover an area of 17.6×104 km2, have been determined. The arithmetic mean value of 947 samples is 0.39 mg/kg, the medium value is 0.30 mg/kg and the contents of selenium vary from 0.06 to 1.29 mg/kg in soils developed on the basement rocks, which are controlled by the basement rocks themselves.
基金the National Institutes of Health, USA, No. NIH R01 AG19181-01A2Shandong Medical and Health Development Project Fund, No. 200387
文摘Cognitive function in the elderly is affected by various environmental,social,and individual factors.Studies show that chemical trace elements are closely related to cognitive function.As a protective factor,selenium promotes cognition in the elderly.However,study results into the effects of selenium on cognition have varied.By eliminating unstable environmental and other related factors,the present study selected elderly individuals from rural areas of the Shandong province to verify whether low selenium exposure is a risk factor for decreased cognitive function.Results demonstrated that age,sex,education,occupation,hypertension,stroke,and body selenium levels were factors affecting cognitive function in the elderly,and that selenium was an important protective factor.Moreover,results supported the hypothesis that a lifelong low selenium level is associated with low cognitive function.
