This research is to develop a weight loss and weight maintenance program through dietary modifications for adults with obesity. Although scientific studies have shown the feasibility of rapid and safe dietary weight loss and subsequent weight maintenance, no efficacious dietary weight management program is widely available, and thus bariatric surgery remains the most reliable approach for weight loss/management. Safe and effective dietary weight loss and subsequent weight maintenance require flexible, individualized advice by an experienced dietitian/nutritionist.

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

All individual participant data that underlie results in a publication will be shared.

Data will be maintained for three years after completion of the study

Findings will be disseminated via abstracts and presentations at scientific conferences and through manuscripts and journal articles within the field.