The role of dietary pattern on hyperglycemia and insulin resistance: a systematic review

This study is a systematic review of unhealthy dietary pattern and its effects on the incidence and control of insulin resistance and diabetes mellitus type 2 The survey is performed in ISI, Cochrane Central Register of Controlled Trials databases, Pubmed, Iran Medex and MagIran for the main keywords which were consists of: "diabetes mellitus", "insulin resistance", "metabolic syndrome", "dietary pattern" and other related key words All journals, E-books, seminars and symposiums were focused. The search is limited to 1992 to 2011. The prospective cohort study, randomized clinical trials and cross sectional studies were selected based on their title, abstract and full text of the materials. After deleting the experimental surveys and studies which were focused on children and adolescents, 738 materials were extracted. The results show that “Western” dietary patterns rich in: red meat, fried and processed dishes, refined cereals, carbohydrate with high glycemic index has statistically significant effects in incidence of hyperglycemia. Adherence to the unhealthy food habits which is rich in trans fatty acids and saturated fatty acids, refined carbohydrate with high glycemic index is related to the insulin resistance, hyperglycemia and risk of diabetes type 2.