Feedback from Arctic charr: Feed flavour stimulation and re-feeding after feed deprivation stimulate genes encoding both orexigenic and anorexigenic neuropeptides.

•No hunger signalling in Arctic charr upon short- and long-term feed deprivation.•Hypothalamic IGF1 expression reduced during long-term feed deprivation in Arctic charr.•Re-feeding and feed flavour increase central orexigenic and anorexigenic signalling.•Changes in appetite regulators visible during transition states (e.g. re-feeding).