Restricting and then resuming certain behaviors and the effects on symptoms of anxiety and depression

The research design is a parallel group randomised controlled trial. Applicants will be randomly allocated to one of two conditions (one intervention and one control), with randomisation stratifying for gender, age and symptom severity. Participants will be randomly allocated to receive one of two conditions. All groups will complete symptom and activity questionnaires each week. The intervention group will follow the protocol previously approved by the MQ HREC (520221263243784): 1. TYD Group. a. During Phase 1 (2 weeks), Baseline Phase, participants will be instructed to continue to perform their usual activities. b. During Phase 2 (2 weeks), Restriction Phase, participants will be instructed to reduce the frequency they perform the actions listed on the TYD-15 item questionnaire (TYD-15) to 2 times each week. Example items include: "I kept a healthy daily routine"; "I went to bed and woke up at a regular time"; "I prepared and ate a healthy meal". c. During Phase 3 (5 weeks), Recovery Phase, participants will be instructed to resume the frequency they perform the actions that they restricted in Phase 2 to 5 times each week. Behaviour will be prompted using automated daily text messages, which were approved by the MQ (HREC 5201831843909) for an earlier study. Adherence throughout the phases will be monitored via the symptom and activity questionnaires administered each week.