Detoxification and body cleansing products and diets have been criticized for their unsound scientific basis, in particular their premise of nonexistent "toxins" and their appropriation of the legitimate medical concept of detoxification. According to the Mayo Clinic, the "toxins" typically remain unspecified and there is little to no evidence of toxic accumulation in patients treated. According to a British Dietetic Association (BDA) Fact Sheet, "The whole idea of detox is nonsense. The body is a well-developed system that has its own builtin mechanisms to detoxify and remove waste and toxins." It went on to characterize the idea as a "marketing myth", while other critics have called the idea a "scam" and a "hoax". The organization Sense about Science investigated "detox" products, calling them a waste of time and money. Resulting in a report that concluded the term is used differently by different companies, most offered no evidence to support their claims, and in most cases its use was the simple renaming of "mundane things, like cleaning or brushing".