A growing body of literature suggests that the effects of host diet on populations of parasites within a host (i.e., infrapopulations) are dictated by the elemental stoichiometry of the parasite, and new data suggest that the stoichiometric composition of parasites can shift in response to a host's diet. The consequences of this shift in parasite stoichiometry for host–parasite interactions are underexplored. Here, we present...