According to the textbook, an intervention to improve weight loss self-efficacy (Roach et al., 2003) demonstrated that:

Question

BlackTom AI · Accepted Answer

Self-efficacy theory (Bandura) posits that increasing a person’s belief in their ability to perform behaviors (here, weight-control practices) improves adherence and outcomes. Behavioral interventions that explicitly target self-efficacy are therefore expected to enhance the effectiveness of dietary changes by increasing persistence, coping with setbacks, and consistent implementation of eating and activity plans.

1. Relevant knowledge points and concepts
- Self-efficacy: confidence in one’s ability to perform specific behaviors; higher self-efficacy predicts better adherence.
- Behavioral intervention vs. diet-only: a psychological/behavioral program can augment a nutritional prescription.
- Empirical comparison: studies typically compare diet-alone, intervention-alone, and combined intervention + diet arms to determine additive effects.

2. Step-by-step reasoning process
- Identify comparison groups used in Roach et al. (2003): diet-alone vs. diet + self-efficacy intervention (and sometimes intervention-alone).
- Measure outcome: change in body weight (or percent weight loss) over the study period.
- If the combined group shows a greater mean weight loss than diet-alone and that difference is statistically meaningful, the combined approach is more effective.

3. Intermediate steps (conceptual measurement steps)
- Baseline weight measured for all participants.
- Apply either diet alone or diet plus self-efficacy intervention.
- Follow-up weight measured; compute weight change = follow-up − baseline for each participant.
- Group means compared; statistical tests determine whether mean(weight change)_combined > mean(weight change)_diet.

4. Why the correct answer is correct
Roach et al. (2003), as reported in the textbook, found that adding a self-efficacy–focused intervention to dietary change produced greater weight loss than altering diet alone. The behavioral component increased adherence and maintenance, yielding superior outcomes.

5. Why the other options are incorrect
- “The intervention alone was no more effective than altering the diet alone.” — Not supported; the key finding concerned the combined approach, not equivalence of intervention-alone.
- “The intervention alone was more effective than altering the diet alone.” — The study emphasized additive benefit with diet; it did not report intervention-alone outperforming diet-alone.
- “The intervention plus the diet was no more effective for weight loss than altering the diet alone.” — This contradicts the reported result showing the combined approach was superior.

6. Conclusion
The correct conclusion, matching the provided answer, is: “The intervention plus the diet was more effective for weight loss than altering the diet alone.”

According to the textbook, an intervention to improve weight loss self-efficacy (Roach et al., 2003) demonstrated that:Single choice

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