Detox diets are of many types . It helps to minimize the amount of chemicals that we ingested and also emphasizes the food that provides nutrients, vitamins and antioxidants that the body needs for detoxification.
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They are efficient in as much as they usually involve cutting out alcohol, fatty foods and other things that could make you put on weight, and having more fruit, vegetables and pulses which have fewer calories and are also better for you. However, the idea of detox itself has no medical evidence behind it at all. Our bodies can 'detox' by themselves if we let them do their job, and you certainly won't 'purify' yourself by following a special diet - that's what your liver is for.

If you want to lose weight and keep it off, it's much better to follow the principle of the eatwell plate and make sure your daily diet has a good balance of nutrients. Alcohol, caffeine and fatty foods can be enjoyed in moderation, and it's also important to get some exercise every day. If you do all this you will find your weight stabilises and your health improves without taking any drastic measures.