According to the "Stages of Change" model, there are five distinct levels of motivational readiness someone must pass through to successfully change a health behaviour, the MSNBC's Health Bulletin reports. In the "pre-contemplation" stage, you have no intention of changing a behaviour. At the "contemplation" step, you intend to change, but not soon. During the "preparation" phase, you intend to change within the next month. You have reached the "action" stage if you have recently changed your usual behaviour. The "maintenance" level is entered only when you have continued the changed behaviour for at least six months. A recent study in the Journal of the American Dietetic Association looked at the change process for adopting the nutrition recommendation that people eat more fruits and vegetables. Half of the variation in people's consumption of fruits and vegetables could be attributed to their stage in the behaviour change process. The study suggested that in order to improve eating habits the individual should consider at what stage of "change" they are currently in. Each level involves tasks that must be completed before the individual can move on to the next. The goal should not be to act immediately but first to resolve the barriers. To move forward, they suggest, the "pros" have to outweigh the "cons."