Ultra Crave: An Investigation of Ultra-Processed Food

Inclusion Criteria:

* 22 to 60 years of age
* English-speaking
* Must own an Android or iPhone Smartphone
* Able and willing to commute to the laboratory
* endorsement of ≥ 4 symptoms on the YFAS 2.0 completed during eligibility screener; at the time of consent, symptom count must remain above threshold for food addiction (this discrepany is based on a previously found tendency during pilot testing to overestimate food addiction symptoms at the time of screening)
* Willing and able to follow specific dietary instructions provided by the study team
* Willing and able to attend 3 in-person lab visits
* Willing to complete 4 phone interviews about foods eaten in the past 24 hours
* Willing to report daily intake of food
* Like the taste of chocolate milkshake (for fMRI scan eligibility only).

Exclusion Criteria:

* participants with a self-reported BMI \< 18.5
* Current diagnosis of disorder that may impact study results or the ability to safely complete study tasks (hypothyroidism (uncontrolled by medication), diabetes, etc.)
* History of food allergies
* Unable to respond to brief questionnaires within 90-minutes during the day
* Work night shifts or irregular shifts
* Restrictive dietary requirements (e.g., vegan) or high levels of picky eating
* Medications (e.g., insulin, antipsychotic medications) that may impact study results or safe completion of study tasks
* Diagnosis of severe mental illness (e.g., schizophrenia, bipolar disorder)
* Diagnosis of a restrictive eating disorder (e.g., Anorexia Nervosa, Bulimia Nervosa, purging disorder) within the last 5 years
* Current diagnoses of disorders that can impact reward/metabolic functioning
* 20+ pound weight fluctuation in the last 3-months
* Prior weight loss surgery (e.g., bariatric surgery)
* Currently pregnant, breastfeeding, trying to get pregnant, or within 6-months of having given birth
* High levels or high-risk intake of alcohol or caffeine
* Use of tobacco or nicotine in the past month
* Use of THC cannabis within the past week
* Unwillingness to abstain from THC cannabis, tobacco or nicotine during the main portion of the study (\~22 days)
* fMRI contraindications (e.g., claustrophobia, metal implants, BMI \>40, etc; Note: this is an fMRI-specific exclusion criterion. participants may be allowed to participate in all other study measures that do not involve fMRI).
* inability to complete a random report within 90 minutes