Mindful eating does not necessarily result in lowered caloric intake. Although it may make people eat more slowly, they could be savoring rich, calorically dense foods, thus producing an increase in calorie intake. Since fullness is a subjective feeling, some people may continue to overeat.
Eating mindfully is a good practice, but it’s not a diet. Diets are essential for weight loss because without them people have no structure to guide them in reducing their caloric intake. Mindful eating can accompany a traditional diet, or be a way to maintain weight loss, but it is unlikely to produce weight loss when practiced by itself.