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Updated: Nov 8, 2025

Control of Eating Behavior Using a Novel Feedback System
Published on: May 8, 2018
Ninjin'yoeito modulates feeding and activity under negative energy balance conditions via the NPY system
Lei Zhang1, Tereli Clark2, Gopana Gopalasingam3
1Neuroscience Division, Garvan Institute of Medical Research, St Vincent's Hospital, Darlinghurst, Sydney, Australia; St. Vincent's Clinical School, University of NSW, Sydney, Australia.
Abstract:
The central and peripheral neuropeptide Y (NPY) system is critically involved in feeding and energy homeostasis control. Disease conditions as well as aging can lead to reduced functionality of the NPY system and boosting it represents a promising option to improve health outcomes in these situations. Here we show that Ninjin-yoeito (NYT), a Japanese kampo medicine comprising twelve herbs, and known to be effective to treat anorexia and frailty, mediates part of its action via NPY/peptide YY (PYY) related pathways. Especially under negative energy homeostasis conditions NYT is able to promote feeding and reduces activity to conserve energy. These effects are in part mediated via signalling through the NPY system since lack of Y4 receptors or PYY leading to modification in these responses highlighting the possibility for combination treatment to improve aging related conditions on energy homeostasis control.
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