Potatoes Consumption and Risk of Type 2 Diabetes: A Meta-analysis

BACKGROUND

Evidence of increased type 2 diabetes (T2D) risk associated with potatoes consumption is equivocal. We aimed to perform a meta-analyses on the association between potatoes consumption and T2D risk in prospective cohort studies.

METHODS

Studies published prior to 31 Aug 2016 were identified in PubMed, EMBASE, and Web of Science. Pooled relative risks (RR) and 95% confidence intervals (95%CI) based upon the highest vs. lowest category of potatoes consumption in each study were calculated in meta-analysis using random-effects models. Dose-response meta-analysis was fitted using generalized least squares regression in order to quantify the association between potatoes consumption and T2D risk.

RESULTS

The pooled RR comparing the highest vs. lowest category of potato consumption was 1.077 (95%CI: 1.005, 1.155). Dose-response meta-analysis revealed T2D risk increased 3.5% (RR=1.035, 95% CI: 1.004-1.067) for additional three serving per week serving of potato. The pooled RR comparing the highest vs. lowest category of French fries consumption was 1.362 (95%CI: 1.004, 1.850). Dose-response meta-analysis indicated T2D risk increased 18.7% (RR = 1.187, 95% CI: 1.067-1.321) for additional three serving per week of French fries.

CONCLUSION

This meta-analysis support a significant positive association between high potatoes consumption and risk of T2D, especially the consumption of French fries.

The Association between GSTM1, GSTT1 Genetic Variants and Gastric Carcinoma Susceptibility in Chinese: A Systematic Review Article

BACKGROUND

Glutathione S-transferases (GSTs) have been investigated as potential carcinoma susceptible genes. However, the relationship between GSTs (GSTM1, GSTT1) variants and gastric carcinoma (GC) risk has been controversial in Chinese population.

METHODS

A comprehensive literature search strategy (PubMed, Chinese Biomedical Database, Chinese National Knowledge Infrastructure, Wan fang Database, etc.) was launched. Crude odds ratios (ORs) and confidence intervals (95% CI) were applied to estimate the strength of the association.

RESULTS

Significant associations between GSTs genetic polymorphisms and GC were evidenced under random-effects model (OR _GSTM1 =1.56, 95% CI: 1.39 to 1.76, I²=50.7%, P<0.0001; OR _GSTT1 =1.24, 95% CI: 1.10 to 1.39, I²=43.6%, P=0.014; OR _GSTM1-GSTT1 =1.51, 95% CI: 1.26 to 1.81, I²=59.7%, P=0.004). The pooled ORs were not qualitatively changed when any single study was omitted by sensitivity analysis.

CONCLUSION

Our results indicated an increased GC risk in Chinese population with GSTM1 and GSTT1 null genotype and GSTM1-GSTT1 dual null genotype. Further multi-center studies are needed to investigate the gene-gene and gene-environment interactions on the susceptibility of GC.