We present a dynamical model incorporating both physiological and psychological factors that predict changes in body mass and composition during the course of a behavioural intervention for weight loss. The model consists of a three-compartment energy balance integrated with a mechanistic psychological model inspired by the Theory of Planned Behaviour. This describes how important variables in a behavioural intervention can influence healthy eating habits and increased physical activity over time. The novelty of the approach lies in representing the behavioural intervention as a dynamical system and the integration of the psychological and energy balance models. Two simulation scenarios are presented that illustrate how the model can improve the understanding of how changes in intervention components and participant differences affect outcomes. Consequently, the model can be used to inform behavioural scientists in the design of optimized interventions for weight loss and body composition change.

中文翻译：

---

用于描述减肥和身体成分变化的行为干预的动态模型


我们提出了一个结合生理和心理因素的动态模型，可以预测减肥行为干预过程中体重和成分的变化。该模型由三室能量平衡与受计划行为理论启发的机械心理模型组成。这描述了行为干预中的重要变量如何影响健康的饮食习惯和随着时间的推移增加身体活动。该方法的新颖之处在于将行为干预表示为动态系统以及心理和能量平衡模型的整合。提出了两个模拟场景，说明该模型如何提高对干预成分的变化和参与者差异如何影响结果的理解。因此，该模型可用于为行为科学家设计减肥和身体成分变化的优化干预措施提供信息。