A valid argument against the efficacy of the GAPS diet is that Dr. Campbell has a website where she sells a lot of products, including books, supplements, DVDs, oils, and other things aimed at people following the GAPS diet. She also offers a pricey training course to become a GAPS practitioner that includes a package to start your own business. Because there is a question as to whether or not she profits from this diet, Dr. Campbell has faced a lot of criticism from the medical community.

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