Body mass index (BMI) acts as a casual factor for developing many diseases such as cardiovascular, breast cancer, heart, diabetes etc. The article presents the impacts of BMI on gestational diabetes Pima Indian heritage women with at least 21 years old. It is established here that mean BMI is larger for gestational diabetes mellitus (GDM) women (P=0.0007) than normal. Mean BMI is directly linked with triceps skin fold thickness (TSFT) (P<0.0001), and it is not related with age (P=0.5185), while

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... it is inversely linked with their joint interaction effect TSFT*Age (P=0.0023). In addition, mean BMI is partially inversely linked with insulin (P=0.1813), and it is partially directly linked with diabetes pedigree function (PDF) (P=0.1601). Variance of BMI is larger for normal women (P<0.0001) than GDM women. It is inversely linked with glucose (P<0.0001), and it is not associated with the number of pregnancies (NOP) (P=0.5494), while it is directly linked with their joint interaction effect Glucose*NOP (P=0.0434). Mean and variance of BMI show many complex impacts on GDM women. Gestational women must care on BMI along with TSFT and glucose levels.