The long-term positive effects of a healthier lifestyle on self-image, general health and overall well-being have been proven within many studies (Hausenblas, 2006). The other way around, studies predict that a negative self-image triggers behaviour that leads to weight gain and further development of a lower body satisfaction (Neumark-Sztainer, 2006).
I believe that by means of design, self-image can be influenced positively on short term. Moreover, I believe that this influence contributes to the initiation of a positive reinforcement between healthier lifestyles and self-image, as a positive self-image affects short-term decision-making, which affects maintenance of healthier lifestyles. So instead of being a one-way positive direction, healthy lifestyle on self-image, it will become a two-way positive relation: where one enhances the other and vice versa.