Food Intake, Endocrine Factors and Brown Fat

Laborértékek

• • Inability to have PET/CT (claustrophobia, weight \> 150 kg);
  • Pregnancy and pregnancy-related conditions (postpartum/lactation during the last 12 months, or planning to become pregnant soon);
  • Major alterations in the menstrual cycle (e.g., amenorrhea);
  • Use of nicotine-based products;
  • Hypo- or hyper- thyroidism (medical history, TSH, T3 or T4 levels out of the normal range);
  • Diabetes mellitus (fasting Hb1Ac \>6.5% or fasting glycaemia\>125 mg/dL) or abnormal oral glucose tolerance test (2h OGTT \> 7.8 mmol/L);
  • Hypertension (blood pressure \> 160/100 mmHg) or abnormal cardiovascular status (arrhythmia and/or long QTc in ECG, abnormal cardiac murmur, previous history of cardiovascular disease);
  • Abnormal coagulopathy (e.g., clotting abnormality);
  • Malignancies, immunological, autoimmune and primary/secondary immunodeficiency disorders (including or not any active treatment).
  • Virus or bacterial infection (both asymptomatic and symptomatic picture) within the 30 days prior to the study start;
  • Episode of fever or major surgery, burns and traumas within the month prior to the study start
  • Chronic infections requiring chronic antibiotic or anti-viral treatment
  • Whole blood donation in the last 3 months (\>400 mL of blood) or plans for blood donation during the entire protocol period
  • Weight change (intentional or not) over the last 6-months \> than 5% of body weight, or plan to lose weight during the study,
  • Use of any medication that, in the opinion of local clinician/researcher, would negatively affect or mitigate full participation and completion, or could influence the study results. This especially applies to the use of β or α adrenergic receptors agonists/antagonists (e.g., β-blockers). In addition, participants in use of medication for glucose control or weight loss such as GLP-1 analogs will not be included.

• • Males and females
  • Between 18 and 45 years old.
  • For the lean group: BMI\<25.0 kg/m2
  • For the group with overweight/obesity: BMI\>27.5 kg/m2 and a waist circumference of over 94 cm (men) or 80 cm (women).