PortionSize Study 3: Assessment in Free-living Conditions

Inclusion Criteria: * Male or female, age 18-62 years * Body mass index (BMI) 18.5-50 kg/m2 * Ownership of an iPhone model 9 or later, which the participant is willing to use for the study * Access to Apple ID, password, and email address and willing to use them during the study * Willing to use data and any accompanying charges as part of study participation * Willing to complete all study procedures and adhere to study visit timelines * Willing to be re-contacted for future research and/or follow-up Exclusion Criteria: oHave been 6-month weight unstable (gain/loss \>5% last 6 months) and/or active weight loss program * Any cardiometabolic disorder that significantly affects what or how much people eat * Active cancer diagnosis or treatment that significantly affects what or how much people eat, excluding some melanomas and other cancers * PBRC employee, as previous reviewers argued that they are not representative of the community ( * 3rd member of the same household to participate (i.e. the 1st and 2nd members of the household cannot participate simultaneously) * Women who are currently pregnant or breastfeeding (self-reported) * Diagnosed with an uncontrolled thyroid disorder (controlled ≥ 3 months of medication) * Have had or plan to have weight loss surgery (gastric band removal may be allowed at PI discretion) * Consume \>28 alcoholic beverages per week * Anyone severely immunocompromised * Serious digestive disorders that significantly affect what or how much peop…