The Daytime Circadian Rhythm in Exhaled Volatile Organic Compounds in People Living Without and Diabetes

Inclusion criteria Subgroup 1: - Age 18 or older - HbA1c below 6.5% - Written willing to sign a consent form Subgroup 2: - Age 18 or older - T1D (Type 1 diabetes) with MDI (multiple daily injection) or CSII (Continuous subcutaneous insulin infusion therapy) therapy \>1 year - Written willing to sign a consent form Subgroup 3 - Age 18 or older - T2D (Type 2 diabetes) with oral antidiabetic medication or insulin therapy - Written willing to sign a consent form Exclusion criteria - Pregnancy or breastfeeding - Smoking (last cigarette less than 6 months ago) - Any chronical lung and intestinal disease diagnosis (such as intestinal bowel disease (IBD); asthma; COPD (chronic obstructive pulmonary disease); lung cancer, …) - Coeliac disease - Lactose and fructose intolerance - Any acute disease diagnosis (such as viral or bacterial infection) - Drinking habit of more than four units of alcohol per day - Current inhaled medicines treatments - Antibiotic treatment in the previous 4 months Always talk to your doctor about whether this trial is right for you.