Table 1 HLaC+Txt Intervention components

Initial tailoring interview

Participants worked with the CC delivery staff to choose:

- 1 weight goal (optional)

• weight maintenance or weight loss (1–6 kg/12wks) [30, 31]

- 1 or 2 SMART goals (specific, measurable, achievable, realistic, time-based) targeting diet and/orphysical activity behaviour

• details for each SMART goal, including:

• 2 preparatory behaviours

• 2 barriers to reaching the goal

• 2 solutions to overcome these barriers

- preferred frequency (# per fortnight) and timing (time of day) of texts

12-week tailoring interview

Participants worked with the CC delivery staff to discuss:

- the acceptability/usefulness of text frequency/timing/content

- the option to adjust initial tailoring interview responses

Text messages (see Table 2)

Based on tailoring interview responses, participants received:

- 1–11 texts/fortnight for 24 weeks