Please select the eligibility criteria that correspond to the clinical trial below.
Title: Is Long-term Maintenance Worth the Wait? Using Real Time Data Capture to Examine Delayed Discounting as a Putative Target of Physical Activity Adherence in Weight Loss Maintenance Interventions
Brief Summary: This study aims to test two strategies for weight loss maintenance. It involves two phases, a weight loss phase and a maintenance phase. During Phase I (the weight loss phase), participants will receive a 16-week, Web-based behavioral weight loss program that involves access to weekly weight loss information and weekly personalized feedback on diet, activity, and weight loss goals. Individuals who lose at least 5% of their initial body weight during this program, will be invited to participate in Phase II. During Phase II, two 4-month treatments for weight loss maintenance will be tested. At the beginning of Phase II, participants will be randomly assigned to one of the two maintenance programs: (1) a behavioral maintenance program that involves in-person group meetings plus daily exercises in which information about a healthy lifestyle is reviewed or (2) a behavioral maintenance program that involves in-person group meetings plus daily exercises in which descriptions of positive future events are reviewed. Throughout the study, participants will complete assessments that examine the effects of the interventions on delay discounting, physical activity, weight, and other important health and psychosocial outcomes.


Options:
A: Inclusion Criteria:

* primary care patient at UCLA Family Health Center or 16th Street Internal Medicine
* age 18 or older,
* English speaking,
* BMI \> 25,
* interested in losing weight,
* smartphone ownership,
* valid email address.

Exclusion Criteria:

* current, planned or previous pregnancy within 6 months,
* currently using a smartphone app for dieting,
* hemodialysis,
* terminal illness
B: 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
C: Inclusion Criteria:

* Age 18-64
* Living in the State of California
* Body mass index (BMI) 27-43
* Must speak, read, and comprehend English
* Access to reliable internet and wi-fi
* Must have a valid email address and phone number
* Must have an Apple iPhone (iPhone 7 or later, iOS 11 or later) with cellular data plan
* Must have a kitchen and be willing to cook
* Willingness to reduce carbohydrate intake to less than 30g/day
* Willingness to restrict intake of added sugar, bread, grain, rice, pasta, sweets, most fruits, pastries, and other carbohydrates
* Willingness to comply with a strict diet for 12 months
* Willingness to eat a diet that is primarily plant and fish-based
* Interest in losing weight

Exclusion Criteria:

* HIV or immunocompromised
* Current or past cancer diagnosis
* Pregnant, breastfeeding, or planned pregnancy in next 12 months
* Beginning or ending hormonal contraception in next 12 months
* Current diagnosis of diabetes
* History of heart attack or stent
* Currently taking glucose-lowering drugs, statins, or oral steroids
* History of gastric bypass surgery or any other weight-loss surgery
* History of anorexia or bulimia
* History of mental illness
* Current smoker or smoked cigarettes within past 12 months
* Currently eating fewer than 50 g carbohydrates per day
* Have tried a low-carb, high fat (ketogenic diet) within the past 3 months
* Recent weight loss or gain of more than 5% body weight in past 6 months
* Previous experience with the Weight Watchers diet app
* Experience with a low-carbohydrate of ketogenic diet within past 6 months
D: Inclusion Criteria:

* Age between 18-70
* Body Mass Index between 30-50
* English Speaking
* Have a smartphone that can be used for study activities

Exclusion Criteria:

* Report being unable to walk 2 blocks without stopping
* Are currently participating in weight loss treatment, have a history of bariatric surgery, or lost ≥5% in the past 6-months
* Are pregnant or plan to become pregnant within 1 year
* Report a heart condition, chest pain during periods of rest or activity, or loss of consciousness on the Physical Activity Readiness Questionnaire
* Report a medical condition that could jeopardize their safety in a weight control program with diet and exercise guidelines
* History of or current traumatic brain injury, dementia or Alzheimer's disease; a history of Multiple Sclerosis, or other neurological disorders
* Report conditions that, in the judgment of the PI, would render them unlikely to follow the protocol (e.g., relocation, dementia, unable to read and write in English)
* Have no Internet access or unwilling to use personal smartphone for study.

Answer: D