Gut and Psychology Syndrome (GAPS) is the trademarked name of a disease invented by Natasha Campbell-McBride, who promotes a diet, the GAPS diet, as its treatment. The diet is a development of the Specific Carbohydrate Diet, and is claimed to treat digestive disorders and hence the neurological conditions - including autism and schizophrenia - that Campbell-McBride says they cause. Campbell-McBride proposes that autistic babies are born without autism, but develop it later as a consequence of having abnormal gut flora and through being exposed to vaccination; the GAPS diet is a two-year regime said to address this by introducing selected ingredients over seven stages, starting with a simple water- and probiotic-based diet and adding more foods successively. Harriet Hall has criticized the claims made for the diet, for example the claim that it can "reverse" autism, for which there is no published evidence. The diet includes bone broth, which has been found to contain high concentrations of lead; it has been suggested that nutritionists take this into account when advising on such a diet. The early stages of the diet have been criticized for being insufficiently nutritious, and concern has been expressed over the use of raw egg since it risks salmonella poisoning.<ref name=sbm/>
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