Table 1

Summary of the intervention steps and content

Intervention groupControl group
Shared components:
  • Study recruitment and sign up online, initial contact to confirm eligibility, consent and randomisation to one of two study conditions;

  • Each participant attends one-on-one face-to-face visits at baseline, 3-, 6- and 12-month follow-up).

Basic educational weight loss information in a form of eBook or physical book at the start of the intervention, information provision and other BCTs.Basic educational weight loss information in a form of eBook or physical book at the start of the intervention, information provision only.
EMA assessment via SMS and feedback report at 3 and 6 months based on the EMA.No EMA assessment via SMS and no feedback report at 3 and 6 months.
Daily text messages and fortnightly educational factual emails (months 0–3), weekly emails that will fit the predictive domain identified in phase I (months 3–6).Fortnightly educational factual emails (months 0–6).
  • EMA, ecological momentary assessment; SMS, short messaging service.