The Effects of Type 1 Diabetes Mellitus and Increased Weight on Gut Microbiome and Urine Metabolome Profiles in Children

The investigators will obtain stool and urine samples from subjects aged 7-17 years in 4 groups: * Group 1: Obese or overweight children within 3 years of diagnosis of T1D * Group 2: Normal weight children within 3 years of diagnosis of T1D * Group 3: Obese or overweight children without T1D * Group 4: Normal weight children without T1D Type 1 diabetes will be defined according to American Diabetes Association criteria along with the presence of pancreatic autoantibodies (GAD65, ICA512, or insulin autoantibodies). Obese and overweight status will be defined by BMI \>85th percentile for age and gender according to CDC criteria. All subjects will provide one-time stool and first morning urine sample. Overweight or obese subjects will additionally have a point of care blood glucose and hemoglobin A1c measurement to ensure that they do not have diabetes. The investigators will perform 16S rRNA sequencing of stool bacteria and mass spectrometry measurement of urine metabolites.