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Sly says that when hired, co-workers instructed him to underfeed the animals to reduce animal waste.

While those worms could eat 60 pounds of food scraps in a week, they do fine on a lot less, and it is more of a problem to put too much food in a bin than to underfeed them because the food will rot and build up heat, killing the worms.

This role in nutrition points to one way in which an off-kilter microbiome can affect its host: what feeds a body can also overfeed or underfeed it.

Underfeed, un-dėr-fēd′, v.t. to feed inadequately.—adjs.

Ever since the introduction of mass armies in Europe in the 17th century, governments have generally understood that to underpay and underfeed one's troops -- and the class of people that supplies them -- is to risk having the guns pointed in the opposite direction from that which the officers recommend.