Hearing about “Investigating Urban Metabolisms” so soon after lunch may have you reeling, but program details for the seventh Architecture and the City Festival may get you ready to digest (tours, films and lectures, that is). For the month of September, the American Institute of Architects’ local chapter has planned events that consider how information, building and transportation systems act almost like a human body in their intricacy. Maybe that’s why a Food Foraging Tour post-SF Design Awards sounds so good.