The purpose of this study is to determine whether a sensor device called an Automatic Ingestion Monitor (AIM) that is worn on eyeglasses can be used with a smartphone to change eating behavior. Participants will wear the device for one week of no-intervention observation. They will then test behavioral interventions focused on eating for two weeks. The researchers hypothesize that messages sent to a smartphone that are based on information from the AIM can reduce the amount of food that is eaten and slow eating.

Inclusion Criteria:

• Body mass index (BMI) between 27 and 45 kg/m-squared
• Weight stable within 5% in the past 6 months
• Self-reports basic familiarity with use of a smartphone

Exclusion Criteria:

• Diagnosed diabetes (type 1 and 2)
• Any poorly controlled medical condition that could affect weight and/or eating behavior (e.g., hypothyroidism)
• Medical conditions or use of medications or diets/supplements known to affect energy regulation or appetite
• Difficulty chewing or swallowing
• Diagnosed eating disorder
• Night or shift work
• Current participation in a weight loss program
• History of bariatric surgery
• Current pregnancy or lactation within the past 1 year, or planning a pregnancy during the study participation period
• Consuming a medically-prescribed or unusual diet (e.g., macrobiotic)
• Food allergies or sensitivities, or other conditions which result in avoidance of a wide range of foods (e.g. celiac disease, tree nut allergy)
• Reported recreational drug use
• Report of conditions that would significantly interfere with an ability to follow the protocol including terminal illness, substance abuse, or other significant uncontrolled psychiatric problem

We will make data and documentation available under a data-sharing agreement that provides for (1) a commitment to use the data for research purposes only; (2) a commitment to securing the data using appropriate computer technology; (3) a commitment to destroying or returning the data after analyses are completed and (4) a commitment not to attempt to identify participants individually. Information shared with outside collaborators will link personal health information to a unique study ID in order to maintain participant anonymity.

A data-sharing agreement that provides for (1) a commitment to use the data for research purposes only; (2) a commitment to securing the data using appropriate computer technology; (3) a commitment to destroying or returning the data after analyses are completed and (4) a commitment not to attempt to identify participants individually. Information shared with outside collaborators will link personal health information to a unique study ID in order to maintain participant anonymity.