Detox diets are dietary plans that claim to have detoxifying effects. The general idea suggests that most food contains contaminants: various ingredients deemed unnecessary for human life, such as flavor enhancers, food colorings, pesticides, and preservatives. Scientists, dietitians, and doctors, while generally viewing "detox diets" as harmless (unless nutritional deficiency results), often dispute the value and need of "detox diets", due to lack of supporting factual evidence or coherent rationale. In cases where a person actually suffers from a disease, belief in the efficacy of a detox diet can result in delay or failure to seek effective treatment.