Adults who were making lifestyle changes to lose weight tended to overestimate how healthy their diet was, according to a new study. In addition, self-perceptions of how much their diet improved over the course of the 12- month study were often inaccurate -- most thought they improved the quality of their diet, yet there actually was not much change based on researchers' assessment. Future research focused on perceptions vs. reality about nutrition may lead to healthier eating patterns.