Please select the eligibility criteria that correspond to the clinical trial below.
Title: An Efficacy, Safety and Pharmacokinetic Study on the Short-term and Long-term Use of Metformin in Obese Children and Adolescents
Brief Summary: The purpose of this study is to determine whether metformin is effective in reducing BMI and insulin resistance in obese children and adolescents.


Options:
A: Inclusion Criteria:

* Age ≥ 10 and ≤ 16 years at study entry
* Caucasian descent
* Obesity defined as BMI-SDS \> 2.3
* Insulin resistance defined as HOMA-IR ≥ 3.4.
* An obtained informed consent from subjects and parents/caregivers.

Exclusion Criteria:

* Presence of T2DM (American Diabetes Association criteria)
* Presence of endocrine disorders with steroid therapy
* Suspicion of polycystic ovarium syndrome;
* Height \< -1.3 SD of target height;
* Syndrome disorders with or without mental retardation;
* Use of anti-hyperglycaemic drugs;
* Pregnancy (pregnancy test will be performed, if applicable);
* (History of) alcohol abuse;
* Impaired renal and/or hepatic function (defined as GFR \< 80 ml/min. GFR=40 x length (cm) / serumcreatinin (μmol/l and ALAT \>150% of normal value for age);
* Use of ritonavir; use of ACE inhibitors;
* Insufficient knowledge of the Dutch language.
B: Inclusion Criteria:

1. Clinical diagnosis of presumed autoimmune type 1 diabetes (T1D) as indicated by age of diagnosis \<10 years or documented positive diabetes-related autoantibodies.

   a. Note: For randomization, presence of at least one of the diabetes-related autoantibodies \[Insulin autoantibodies (IAA) at diagnosis prior to initiation of insulin, Islet cell antibodies (ICA), Anti-GAD (GAD65), Anti-IA2 (IA2), Zinc Transporter 8 (ZnT8)\] must be documented either from medical records or new laboratory measurement (IAA and ICA not measured by central lab) sent to central lab for participants who were ≥10 years old at diagnosis.
2. Age: 12 to \<20 years.
3. Duration of type 1 diabetes: ≥1 years.
4. Current insulin regimen involves either use of an insulin pump or multiple daily injections of insulin (at least 3 shots per day) for the last three months, with no plans to switch the modality of insulin administration during the next 6 months (e.g., injection user switching to a pump, pump user switching to injections).
5. Hemoglobin A1c: 7.5% - \<10.0% from point of care measurement or local lab on day of screening visit or within 1 month prior.
6. BMI: ≥85th percentile adjusted for age and sex .
7. Total daily dose of insulin: ≥0.8 units per kg per day.
8. Average of ≥3 Self-Monitoring Blood Glucose (SMBG) tests per day prior to initiating study and from download of study-provided blood glucose meter following screening visit.
9. Available for at least 6 months of follow-up, has home phone (or access to phone), and willing to be contacted by clinical site staff.
10. Expected to comply with protocol in investigator's judgment.

Exclusion Criteria:

1. Use of non-insulin medications for blood glucose control within prior 6 months or planning to use within next 6 months (other than study drug).
2. Use of medications for weight reduction (such as: Belviq (lorcaserin), Qsymia (Phentermine + topiramate), Orlistat (xenical)) within the prior 6 months or planning to use within next 6 months.
3. Use of a medication such as stimulants, psychotropic agents and oral/inhaled glucocorticoids that could affect weight gain or glycemic control of T1D or planning to use within the next 6 months.
4. Any condition that in the judgment of the investigator will adversely affect the completion of the protocol.
5. Females: pregnant, lactating, or intending to become pregnant within the next 34 weeks

   * A negative urine pregnancy test will be required for all females An effective contraceptive method or abstinence will be required for all females who have experienced menarche
   * Requirements regarding pregnancy testing prior to enrollment and monitoring for pregnancy over the course of the study may be further defined by each individual Institutional Review Board (IRB)
6. Clinical diagnosis of celiac disease that is in poor control as defined by most recent tissue transglutaminase (tTG) that is in the abnormal range.
7. History of ≥1 diabetic ketoacidosis events in the past 3 months.
8. History of ≥1 severe hypoglycemic events (cognitive impairment that required assistance to treat) in the past 3 months.
9. History of anemia or vitamin B12 deficiency in the past 2 years.
10. Participation in an intervention study in the past 3 months.
C: Inclusion Criteria:

* Body mass index \> or = 1.2 times the 95th percentile (based on gender and age) or Body mass index \> or = 35 kg/m2
* 12-19 years old

Exclusion Criteria:

* Type 1 or 2 diabetes mellitus
* Previous (within 3-months) or current use of weight loss medication (patients may undergo washout)
* Previous bariatric surgery
* Recent initiation (within 1-month) of anti-hypertensive or lipid medication
* Previous (within 1-month) or current use of medication to treat insulin resistance or hyperglycemia (patients may undergo washout)
* Major psychiatric disorder
* Pregnant or planning to become pregnant
* Tobacco use
* Liver/renal dysfunction
* History of pancreatitis
* Obesity associated with genetic disorder
* Hyperthyroidism or uncontrolled hypothyroidism
* Uncontrolled hypertriglyceridemia (=300 mg/dL)
* Current eating disorder
* Previous (within 3-months) or current use of drugs associated with weight gain (e.g. steroids/anti-psychotics)
D: Inclusion Criteria:

* Subject's body mass index (BMI) was \>= 27 kg/m(2) and \<= 45 kg/m(2) or their BMI was \>= 25 kg/m(2) and \< 27 kg/m(2) with waist circumference of \>= 102 cm in males or \>= 88 cm in females.
* Medical history positive for:

  * Preexisting cardiovascular disease (i.e., coronary artery disease, cerebrovascular disease, or peripheral arterial occlusive disease) and/or
  * Type 2 diabetes mellitus with at least 1 other risk factor (i.e., dyslipidemia, controlled hypertension, current smoker, or diabetic nephropathy with evidence of microalbuminuria)

Exclusion Criteria:

* History of recent myocardial infarction.
* Heart failure symptoms greater than New York Heart Association Functional Class II.
* Hemodynamically significant valvular or left ventricular (LV) tract obstruction.
* Subjects without a pacemaker and with any of the following:

  * Sinus bradycardia (\< 50 bpm)
  * Sick sinus syndrome
  * Atrioventricular block of more than 1st degree
* Mean sitting systolic blood pressure (SBP) \> 160 mmHg. Mean sitting diastolic blood pressure (DBP) \> 100 mmHg. Mean sitting heart rate (HR) \> 100 bpm.
* Syncopal episodes presumed to be due to uncontrolled life-threatening arrhythmias.
* Planned cardiac surgery or coronary angioplasty within 6 months of screening.
* History of recent non-hemorrhagic stroke or transient ischemic attack (TIA), history of hemorrhagic stroke.
* Hyperthyroidism.
* Known chronic liver disease or endstage renal disease.
* Severe, symptomatic benign prostatic hyperplasia which may require surgery.
* Known pheochromocytoma, history of narrow angle glaucoma, Gilles de la Tourette syndrome, history of seizures, history of bariatric or abdominal obesity surgery (excluding liposuction).
* Concomitant use of monoamine oxidase inhibitors or drugs that increase levels of serotonin in the brain.
* Treated hypertension stabilized for less than 3 months.
* Inability to perform regular physical activity.

Answer: A