No antibiotics were involved but the WTP diet consisted of 1344Cal daily diet of canned porridge (. . ."4 cans of gruel per day" . . .) - Quoted from 'Supplimental Material' to the original study publication http://www.nature.com/ismej/journal/vaop/ncurrent/extref/ism.... But, there is absolutely no specific information as to the actual ingredients of the "porridge/gruel" so there seems to be no way to actually repeat this research or try the diet individually.