This single site investigator-initiated prospective observational study will enroll up to 150 participants 13-26 years of age with Type 1 diabetes (T1D) and utilize ecological momentary assessment methods (EMA) to examine associations between different diabetes psychological domains (distress, anxiety, and depression) in real-time on self-efficacy, self-management behaviors, and glycemic outcomes.

Inclusion Criteria:

• Diagnosis of type 1 diabetes for at least six months
• Fluent in spoken and written English
• Willing to carry around their mobile phone during the home monitoring period with daily access to cellular or WiFi connectivity
• Willing to wear a continuous glucose monitor (CGM) device during the home monitoring period

Exclusion Criteria:

• Any social or medical condition that would, in the opinion of the Principal Investigator (PI), prevent complete participation in the study or would pose significant hazard to the subject's participation
• Skin conditions or diseases that would interfere with the CGM sensor placement or accuracy (such as extensive psoriasis, extensive eczema, scarring, etc.)
• Scheduled X-ray, MRI, CT scan, or high-frequency electrical heat (diathermy) treatment during the period of CGM wear (or any other activity that would necessitate CGM sensor or insulin pump removal) that cannot be scheduled around or accommodated within the study assessment windows
• Currently pregnant or plan to become pregnant during participation in the study

Participants must meet eligibility criteria to be enrolled