The investigators have identified a support group on social media with ~1500 members (children and adults), the majority of whom have T1DM and follow a carbohydrate-restricted diet. Many participants report exceptionally low HbA1C and insulin requirements. If these anecdotal reports are reflective of a large group of people with type 1 diabetes, a clinical trial would be warranted.

The investigators propose to survey the above-mentioned group and their professional diabetes care providers to characterize glycemic control and explore associated dietary and diabetes care factors.

The surveys will address questions in the following domains: 1) Diabetes diagnosis and treatment; 2) Carbohydrate-restricted diet; 3) Insulin regimen; 4) Other diabetes related care; 5) Diabetes complications; 6) Other related health and healthcare; 7) Patient provider interactions; 8) Socio-demographics. Drafts of these surveys are included in the appendix of this protocol.

Inclusion Criteria:

• Adult patients with a diagnosis of T1DM who are currently on insulin treatment or
• Adults who are a parent or guardian of a child with T1DM who is currently on insulin treatment and
• Self-reported use of a regimen including carbohydrate restriction for at least 3 months

Exclusion Criteria:

• Women who are pregnant or breastfeeding.

The social media group on Facebook, TYPEONEGRIT, includes approximately 1500 members, the majority of whom reportedly have type 1 diabetes and follow a carbohydrate-restricted diet.

Deidentified data will be shared with external collaborators.