hritis Medication Depression Consumption of Energy Stroke Dense Foods Emotional Reproductive Factor Problems Environment Coronary Heart Disease FIGURE 9.3 Diagrammatic representation of the causes and effects of childhood obesity. 9.6 SELF-DETERMINATION THEORY (SDT) AND OBESITY PREVENTION All modern lifestyle risk factors are directly affected by the person's health behavior, whether it be related to diet, physical activity, screen-based behaviors, sleep time, and the like. According to self-determination theory (SDT), not all forms of motivation have an equal effect on behaviors. An important consideration is whether the behavior is intrinsically or extrinsically motivated. Intrinsically motivated behavior constitutes that behavior for which an individual performs activities in order to meet their own purposes which fulfil the basic physiological needs for autonomy, competence, and relatedness, resulting in a feeling of will- ingness and pleasure. Extrinsically motivated behavior is done due to external demand or reward. Such behaviors have an external line of control [33]. In the present times, STD has become a vital framework for designing interventions in the field of health care. Various studies have shown a positive impact of using intrinsic motivation over extrinsic motivation which leads to sustainable desired behavioral change. A person's health and wellbeing are related to a person's health behaviors and motivation is an important factor for health behavior change and intrinsically motivated behavior change is sustainable and contributes to the health and wellbeing of an individual [34]. This leads to the very important question of what type of intervention will bring about a sustainable health behavior change. Positive computing [35] or persuasive technology [36] can provide an answer to this question. Positive computing is often used to focus people's attention on par- ticular facts that can bring about a change in their thinking and behaviors. It is a computer system, mobile application, device, and 