Allatostatins are neuropeptide hormones in insects and crustacea. They have a twofold function: they both inhibit the generation of juvenile hormone and reduce their food intake. They are therefore putative targets for insecticide research. Allatostatins are neuropeptide hormones in insects and crustacea. They have a twofold function: they both inhibit the generation of juvenile hormone and reduce their food intake. They are therefore putative targets for insecticide research. Three biochemically distinct types of Allatostatin have been described: A, B and C. Although originally identified in different insects, all three types are found in the fruitfly, Drosophila. These types of Allatostatin are not normally found in the same neurons, and so probably have different roles.