Every person with type 1 diabetes needs personalized advice to integrate physical activity into daily diabetes management. The purpose of this study is to collect data on food intake, physical activity, glucose levels and insulin delivery from people with type 1 diabetes who are physically active. At least 25 people with type 1 diabetes will be asked to perform 25 sports activities of at least half an hour, wear an activity tracker (day and night) and chest strap (during sports activities), and log data on food intake, periods and type of physical activity, and feelings (e.g., sick, stress) in a diary app. Diabetes data such as insulin administration and sensor data will be collected through diabetes management platforms. The primary endpoint involves a database containing data on glucose, insulin administration, physical activity, and food intake of people with type 1 diabetes for statistical analyses and visualizations regarding the relationship between physical activity and blood glucose response.

Inclusion Criteria:

• Signed informed consent
• 18-80 years old
• Type 1 diabetes ≥1 year
• Using a CGM for more than 6 months
• Using insulin (insulin pens, insulin pumps or hybrid closed-loop systems) to manage glycaemia for more than 6 months
• No use of adjunctive therapies, such as SGLT2-inhibitors or GLP-1 analogues
• No known diabetic gastroparesis
• HbA1c of the last two diabetes consultations are both <10%
• Being physically active at least twice a week on two separate days for 30 consecutive minutes

Exclusion Criteria:

• Age <18 years or >80 years
• People with type 2 diabetes, people with secondary diabetes
• Begin treatment with insulin (insulin pens, insulin pumps or hybrid closed-loop systems) less than 6 months before inclusion
• Not using CGM prior to inclusion
• Known diabetic gastroparesis
• HbA1c > 10% during one of the last two diabetes consultations
• Not willing to use an activity tracker, the diary app or the food app
• Not being physically active on a regular basis