The potentially high mercury content in some fish is cited to argue against increased fish consumption. Sudden changes in diet have been linked to fainting and other medical issues. It is therefore of utmost importance to gradually introduce the dietary changes, especially if they are extreme compared to the present diet. Fasting should never be undertaken without a proper understanding of its procedures, and long-term changes to the diet should always include a balance of the nutrients needed for the sustenance of the human body - carbohydrates, protein, unsaturated fat, vitamins, minerals and water. The same is advisable for any diet, cleansing or otherwise, in order to maintain optimal health.
Highly restrictive detox diets such as Water fasting or the Master Cleanse are not the safest form of weight loss. These diets, if done improperly or for too long, may result in nutrient deficiencies. With less lean muscle tissue, the body's metabolic needs decrease, which hampers weight loss efforts unless calories are lessened further in the diet.
While many people have provided testimonials to their health improvements in following a "detox" diet lifestyle, some of these people may have started the detox diet after coming off an unhealthy diet high in sugar and processed food that may lack nutrients. Any improvements cited from such people would only prove the effectiveness of a detox diet over an average diet, and not that it is the ideal diet that doesn't carry its own unique health risks. Some of the changes recommended in certain "detox"diet lifestyles are ones that agree with mainstream medical advice, such as consuming a diet high in fruits and vegetables. Detox Diet