Please select the eligibility criteria that correspond to the clinical trial below.
Title: N/A
Brief Summary: The purpose of this study is to compare three methods of delivering behavioral weight loss treatment.Participants are randomly assigned to one of three 18-month weight loss treatments (group, individual, or smartphone treatment). Participants who are assigned to group treatment will attend group meetings weekly for the first 6 months, then every 2 weeks for 6 months, and then monthly for the final 6 months. Participants who are assigned to individual treatment will attend one-on-one sessions with a weight loss counselor every month for 18 months. Participants who are assigned to smartphone treatment will use a smartphone to learn and practice weight loss skills. They will also attend one-on-one sessions with a weight loss counselor every month for 18 months. Assessment visits are conducted at baseline, 6, 12, and 18 months.


Options:
A: Inclusion Criteria:

* BMI\> = 25 mg / kg
* Holder smartphone
* Sign informed consent

Exclusion Criteria:

* Presence of physical or mental illnesses that prevent the realization of physical activity
* Be participating in another research project
* Pregnancy or lactation
* Patients who are on diet or drug treatment for weight loss
* History of myocardial infarction or stroke
B: Inclusion Criteria:

* ages 21-65 years old
* Body Mass Index (BMI) 25-45 kg/m2
* interested in losing weight through dietary change
* current use of iPhone or Android smartphone
* current use of email address
* has daily access to a bathroom scale
* no recent weight loss (≥10 lbs) in the past 6 months
* able to read and write in English
* able to attend 3 in-person evaluation visits at Duke University in Durham, North Carolina over a 3-month period

Exclusion Criteria:

* current participation in another weight loss treatment
* currently pregnant or planning to become pregnant within study period, or \< 1 year post-partum
* history of cardiovascular event, eating disorder, diabetes mellitus, hypothyroidism, cancer, end stage renal disease
* current uncontrolled hypertension
* use of the MyFitnessPal app to track food in the past 6 months
* Former or planned bariatric surgery
* current use of medication (e.g., lithium, steroids, anti-psychotics)
* use of weight loss medication in past 6 months
* profound cognitive, developmental, or psychiatric disorders or recent hospitalization in a psychiatric facility
C: Inclusion Criteria:

* Body Mass Index (kg/m2) of 25-45.
* English language fluency
* Ability to read at a 6th grade level
* Availability to attend weekly treatment sessions in Providence, RI

Exclusion Criteria:

* Any heart condition that limits ability to participate in physical activity
* Chest Pain
* Any cognitive of physical limitation that would preclude use of a smartphone
* Serious mental illness
* Historical or current eating disorder
* Previous or planned bariatric surgery
* Use of weight loss medication
* Recent pregnancy or a plan to become pregnant in the next 6 months
* Participation in a study at the Weight Control and Diabetes Research Center within the last two years
* A weight loss of greater than 5% body weight in the last 6 months
D: Inclusion Criteria:

* 18-64 years of age
* BMI between 25 to 45.0 kg/m² (NOTE: The investigators elected to cap this at 45.0 kg/m² to minimize potential risks and to reduce the potential for obesity to limit exercise participation)
* Ability to provide informed consent and health risk assessment prior to participation in this study
* Speak, read, and write either English and/or Spanish

Exclusion Criteria:

* Uncontrolled diabetes mellitus
* History of bariatric surgery
* Report medical condition or treatment for a medical condition that could affect body weight or ability to engage in structured physical activity that is consistent with the intervention for this study
* Current congestive heart failure, angina, uncontrolled arrhythmia, or other symptoms indicative of an increased acute risk for a cardiovascular event
* Resting systolic blood pressure of ≥150 mmHg or resting diastolic blood pressure of ≥90 mmHg
* Eating disorders that would contraindicate weight loss or physical activity
* Alcohol or substance abuse
* Currently treated for psychological issues (i.e. depression, bipolar disorder, etc.), taking psychotropic medications with the previous 12 months, or hospitalized for depression within the previous 5 years
* Report exercise on ≥3 days per week for ≥ 20 minutes per day over the past 3 months
* Report weight loss of ≥5% or participating in a weight reduction diet program in the past 3 months
* Report plans to relocate to a location that limits their access to the study site or having employment, personal, or travel commitments that prohibit attendance to all of the scheduled assessments

Answer: C