A 7-day detox diet plan is simply a "clean eating" program that entails eating significantly more fresh fruits and vegetables to assist the body in cleansing substances. Toxins can come from the environment as well as what we eat. If you are a beginner, however, it is not advisable to follow a 7-day detox regimen. Start with a 1-day detox to give your body a rest and check for any noticeable adverse effects.