Do remember that all the good or bad organisms living in us eat either, us, or what we eat or eliminate, and since all food gets broken down into smaller units the already small units known as carbon sugars (fruit juices, honey, ect),would be prime choice for most food chain hitch hikers, as they are for our systems also.
Persons wanting to infringe on the parasites environment by limiting the ease or ability to assimulate food products, also make it harder for their own systems.
Something like 10s upon 10s of thousands of microorganisms living in each of us.