Knowledge-based Dietary Weight Management.

Inclusion criteria:

• age 18-64 years;
• body mass index (BMI) >28 kg/m2;
• not currently pregnant or lactating;
• have Wi-Fi at home, a working email, and an iPhone or Android smartphone.
• no self-reported severe metabolic, cardiovascular or musculoskeletal disease;
• not using insulin injection;
• able to attend the 22 (1 hour) diet improvement sessions.
• willing to lose 20 lb. or more for 6 months and maintain a healthy weight for one year.
• keep weighing their weight for one and a half years.
• fluent in reading and writing English.

Exclusion criteria:

• age <18 or >64 years;
• body mass index of <28 kg/m2;
• currently pregnant;
• currently lactating;
• self-reported with the severe metabolic, cardiovascular or musculoskeletal disease;
• use insulin injection;
• not able to attend the 22 (1 hour) diet improvement sessions for 1 year;
• failed to set up a Wi-Fi scale;
• failed to submit a food frequency questionnaire